author | vlivanov |
Thu, 30 May 2019 13:39:13 +0300 | |
changeset 55105 | 9ad765641e8f |
parent 54786 | ebf733a324d4 |
child 55345 | 492b644bb9c2 |
child 58678 | 9cf78a70fa4f |
permissions | -rw-r--r-- |
1 | 1 |
/* |
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
2 |
* Copyright (c) 1998, 2019, Oracle and/or its affiliates. All rights reserved. |
1 | 3 |
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 |
* |
|
5 |
* This code is free software; you can redistribute it and/or modify it |
|
6 |
* under the terms of the GNU General Public License version 2 only, as |
|
7 |
* published by the Free Software Foundation. |
|
8 |
* |
|
9 |
* This code is distributed in the hope that it will be useful, but WITHOUT |
|
10 |
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
|
11 |
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
|
12 |
* version 2 for more details (a copy is included in the LICENSE file that |
|
13 |
* accompanied this code). |
|
14 |
* |
|
15 |
* You should have received a copy of the GNU General Public License version |
|
16 |
* 2 along with this work; if not, write to the Free Software Foundation, |
|
17 |
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
|
18 |
* |
|
5547
f4b087cbb361
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
2526
diff
changeset
|
19 |
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
f4b087cbb361
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
2526
diff
changeset
|
20 |
* or visit www.oracle.com if you need additional information or have any |
f4b087cbb361
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
2526
diff
changeset
|
21 |
* questions. |
1 | 22 |
* |
23 |
*/ |
|
24 |
||
7397 | 25 |
#include "precompiled.hpp" |
26 |
#include "classfile/vmSymbols.hpp" |
|
35171
cf7d5a1d0662
8145153: Convert TraceMonitorInflation to Unified Logging
rprotacio
parents:
33595
diff
changeset
|
27 |
#include "logging/log.hpp" |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
28 |
#include "logging/logStream.hpp" |
50113 | 29 |
#include "jfr/jfrEvents.hpp" |
49360 | 30 |
#include "memory/allocation.inline.hpp" |
31345
1bba15125d8d
8015086: add interned strings to the shared archive.
jiangli
parents:
30244
diff
changeset
|
31 |
#include "memory/metaspaceShared.hpp" |
27165
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
32 |
#include "memory/padded.hpp" |
7397 | 33 |
#include "memory/resourceArea.hpp" |
54786 | 34 |
#include "memory/universe.hpp" |
7397 | 35 |
#include "oops/markOop.hpp" |
36 |
#include "oops/oop.inline.hpp" |
|
40655
9f644073d3a0
8157907: Incorrect inclusion of atomic.hpp instead of atomic.inline.hpp
dholmes
parents:
37251
diff
changeset
|
37 |
#include "runtime/atomic.hpp" |
7397 | 38 |
#include "runtime/biasedLocking.hpp" |
39 |
#include "runtime/handles.inline.hpp" |
|
49449
ef5d5d343e2a
8199263: Split interfaceSupport.hpp to not require including .inline.hpp files
coleenp
parents:
49360
diff
changeset
|
40 |
#include "runtime/interfaceSupport.inline.hpp" |
7397 | 41 |
#include "runtime/mutexLocker.hpp" |
42 |
#include "runtime/objectMonitor.hpp" |
|
43 |
#include "runtime/objectMonitor.inline.hpp" |
|
44 |
#include "runtime/osThread.hpp" |
|
49594
898ef81cbc0e
8200106: Move NoSafepointVerifier out from gcLocker.hpp
stefank
parents:
49593
diff
changeset
|
45 |
#include "runtime/safepointVerifiers.hpp" |
49593
4dd58ecc9912
8200105: Remove cyclic dependency between oop.inline.hpp and collectedHeap.inline.hpp
stefank
parents:
49480
diff
changeset
|
46 |
#include "runtime/sharedRuntime.hpp" |
7397 | 47 |
#include "runtime/stubRoutines.hpp" |
48 |
#include "runtime/synchronizer.hpp" |
|
14583
d70ee55535f4
8003935: Simplify the needed includes for using Thread::current()
stefank
parents:
14488
diff
changeset
|
49 |
#include "runtime/thread.inline.hpp" |
52703
e7fdc9d9c376
8202415: Incorrect time logged for monitor deflation
dcubed
parents:
52459
diff
changeset
|
50 |
#include "runtime/timer.hpp" |
31782
b23b74f8ae8d
8130448: thread dump improvements, comment additions, new diagnostics inspired by 8077392
dcubed
parents:
31345
diff
changeset
|
51 |
#include "runtime/vframe.hpp" |
49480
d7df2dd501ce
8199809: Don't include frame.inline.hpp and other.inline.hpp from .hpp files
coleenp
parents:
49449
diff
changeset
|
52 |
#include "runtime/vmThread.hpp" |
46625 | 53 |
#include "utilities/align.hpp" |
7397 | 54 |
#include "utilities/dtrace.hpp" |
55 |
#include "utilities/events.hpp" |
|
56 |
#include "utilities/preserveException.hpp" |
|
1 | 57 |
|
58 |
// The "core" versions of monitor enter and exit reside in this file. |
|
59 |
// The interpreter and compilers contain specialized transliterated |
|
60 |
// variants of the enter-exit fast-path operations. See i486.ad fast_lock(), |
|
61 |
// for instance. If you make changes here, make sure to modify the |
|
62 |
// interpreter, and both C1 and C2 fast-path inline locking code emission. |
|
63 |
// |
|
64 |
// ----------------------------------------------------------------------------- |
|
65 |
||
66 |
#ifdef DTRACE_ENABLED |
|
67 |
||
68 |
// Only bother with this argument setup if dtrace is available |
|
69 |
// TODO-FIXME: probes should not fire when caller is _blocked. assert() accordingly. |
|
70 |
||
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10739
diff
changeset
|
71 |
#define DTRACE_MONITOR_PROBE_COMMON(obj, thread) \ |
1 | 72 |
char* bytes = NULL; \ |
73 |
int len = 0; \ |
|
74 |
jlong jtid = SharedRuntime::get_java_tid(thread); \ |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10739
diff
changeset
|
75 |
Symbol* klassname = ((oop)(obj))->klass()->name(); \ |
1 | 76 |
if (klassname != NULL) { \ |
77 |
bytes = (char*)klassname->bytes(); \ |
|
78 |
len = klassname->utf8_length(); \ |
|
79 |
} |
|
80 |
||
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10739
diff
changeset
|
81 |
#define DTRACE_MONITOR_WAIT_PROBE(monitor, obj, thread, millis) \ |
10739 | 82 |
{ \ |
26684
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
83 |
if (DTraceMonitorProbes) { \ |
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10739
diff
changeset
|
84 |
DTRACE_MONITOR_PROBE_COMMON(obj, thread); \ |
10739 | 85 |
HOTSPOT_MONITOR_WAIT(jtid, \ |
26684
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
86 |
(uintptr_t)(monitor), bytes, len, (millis)); \ |
10739 | 87 |
} \ |
88 |
} |
|
89 |
||
31856 | 90 |
#define HOTSPOT_MONITOR_PROBE_notify HOTSPOT_MONITOR_NOTIFY |
91 |
#define HOTSPOT_MONITOR_PROBE_notifyAll HOTSPOT_MONITOR_NOTIFYALL |
|
22190
d306a75a70d3
8029726: On OS X some dtrace probe names are mismatched with Solaris
sla
parents:
20282
diff
changeset
|
92 |
#define HOTSPOT_MONITOR_PROBE_waited HOTSPOT_MONITOR_WAITED |
10739 | 93 |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10739
diff
changeset
|
94 |
#define DTRACE_MONITOR_PROBE(probe, monitor, obj, thread) \ |
10739 | 95 |
{ \ |
26684
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
96 |
if (DTraceMonitorProbes) { \ |
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10739
diff
changeset
|
97 |
DTRACE_MONITOR_PROBE_COMMON(obj, thread); \ |
10739 | 98 |
HOTSPOT_MONITOR_PROBE_##probe(jtid, /* probe = waited */ \ |
26684
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
99 |
(uintptr_t)(monitor), bytes, len); \ |
10739 | 100 |
} \ |
101 |
} |
|
102 |
||
1 | 103 |
#else // ndef DTRACE_ENABLED |
104 |
||
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10739
diff
changeset
|
105 |
#define DTRACE_MONITOR_WAIT_PROBE(obj, thread, millis, mon) {;} |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10739
diff
changeset
|
106 |
#define DTRACE_MONITOR_PROBE(probe, obj, thread, mon) {;} |
1 | 107 |
|
108 |
#endif // ndef DTRACE_ENABLED |
|
109 |
||
6975 | 110 |
// This exists only as a workaround of dtrace bug 6254741 |
111 |
int dtrace_waited_probe(ObjectMonitor* monitor, Handle obj, Thread* thr) { |
|
112 |
DTRACE_MONITOR_PROBE(waited, monitor, obj(), thr); |
|
113 |
return 0; |
|
114 |
} |
|
115 |
||
116 |
#define NINFLATIONLOCKS 256 |
|
30244 | 117 |
static volatile intptr_t gInflationLocks[NINFLATIONLOCKS]; |
6975 | 118 |
|
30244 | 119 |
// global list of blocks of monitors |
47634
6a0c42c40cd1
8188220: Remove Atomic::*_ptr() uses and overloads from hotspot
coleenp
parents:
47216
diff
changeset
|
120 |
PaddedEnd<ObjectMonitor> * volatile ObjectSynchronizer::gBlockList = NULL; |
30244 | 121 |
// global monitor free list |
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
122 |
ObjectMonitor * volatile ObjectSynchronizer::gFreeList = NULL; |
30244 | 123 |
// global monitor in-use list, for moribund threads, |
124 |
// monitors they inflated need to be scanned for deflation |
|
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
125 |
ObjectMonitor * volatile ObjectSynchronizer::gOmInUseList = NULL; |
30244 | 126 |
// count of entries in gOmInUseList |
6975 | 127 |
int ObjectSynchronizer::gOmInUseCount = 0; |
30244 | 128 |
|
129 |
static volatile intptr_t gListLock = 0; // protects global monitor lists |
|
130 |
static volatile int gMonitorFreeCount = 0; // # on gFreeList |
|
131 |
static volatile int gMonitorPopulation = 0; // # Extant -- in circulation |
|
132 |
||
20282
7f9cbdf89af2
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
18025
diff
changeset
|
133 |
#define CHAINMARKER (cast_to_oop<intptr_t>(-1)) |
6975 | 134 |
|
29070 | 135 |
|
136 |
// =====================> Quick functions |
|
137 |
||
138 |
// The quick_* forms are special fast-path variants used to improve |
|
139 |
// performance. In the simplest case, a "quick_*" implementation could |
|
140 |
// simply return false, in which case the caller will perform the necessary |
|
141 |
// state transitions and call the slow-path form. |
|
142 |
// The fast-path is designed to handle frequently arising cases in an efficient |
|
143 |
// manner and is just a degenerate "optimistic" variant of the slow-path. |
|
144 |
// returns true -- to indicate the call was satisfied. |
|
145 |
// returns false -- to indicate the call needs the services of the slow-path. |
|
146 |
// A no-loitering ordinance is in effect for code in the quick_* family |
|
147 |
// operators: safepoints or indefinite blocking (blocking that might span a |
|
148 |
// safepoint) are forbidden. Generally the thread_state() is _in_Java upon |
|
149 |
// entry. |
|
31856 | 150 |
// |
151 |
// Consider: An interesting optimization is to have the JIT recognize the |
|
152 |
// following common idiom: |
|
153 |
// synchronized (someobj) { .... ; notify(); } |
|
154 |
// That is, we find a notify() or notifyAll() call that immediately precedes |
|
155 |
// the monitorexit operation. In that case the JIT could fuse the operations |
|
156 |
// into a single notifyAndExit() runtime primitive. |
|
157 |
||
158 |
bool ObjectSynchronizer::quick_notify(oopDesc * obj, Thread * self, bool all) { |
|
159 |
assert(!SafepointSynchronize::is_at_safepoint(), "invariant"); |
|
160 |
assert(self->is_Java_thread(), "invariant"); |
|
161 |
assert(((JavaThread *) self)->thread_state() == _thread_in_Java, "invariant"); |
|
35492
c8c0273e6b91
8146690: Make all classes in GC follow the naming convention.
david
parents:
35171
diff
changeset
|
162 |
NoSafepointVerifier nsv; |
31856 | 163 |
if (obj == NULL) return false; // slow-path for invalid obj |
164 |
const markOop mark = obj->mark(); |
|
165 |
||
166 |
if (mark->has_locker() && self->is_lock_owned((address)mark->locker())) { |
|
167 |
// Degenerate notify |
|
168 |
// stack-locked by caller so by definition the implied waitset is empty. |
|
169 |
return true; |
|
170 |
} |
|
171 |
||
172 |
if (mark->has_monitor()) { |
|
173 |
ObjectMonitor * const mon = mark->monitor(); |
|
49658 | 174 |
assert(oopDesc::equals((oop) mon->object(), obj), "invariant"); |
31856 | 175 |
if (mon->owner() != self) return false; // slow-path for IMS exception |
176 |
||
177 |
if (mon->first_waiter() != NULL) { |
|
178 |
// We have one or more waiters. Since this is an inflated monitor |
|
179 |
// that we own, we can transfer one or more threads from the waitset |
|
180 |
// to the entrylist here and now, avoiding the slow-path. |
|
181 |
if (all) { |
|
182 |
DTRACE_MONITOR_PROBE(notifyAll, mon, obj, self); |
|
183 |
} else { |
|
184 |
DTRACE_MONITOR_PROBE(notify, mon, obj, self); |
|
185 |
} |
|
186 |
int tally = 0; |
|
187 |
do { |
|
188 |
mon->INotify(self); |
|
189 |
++tally; |
|
190 |
} while (mon->first_waiter() != NULL && all); |
|
32614
b7b2407bc7e5
8049304: race between VM_Exit and _sync_FutileWakeups->inc()
dcubed
parents:
31856
diff
changeset
|
191 |
OM_PERFDATA_OP(Notifications, inc(tally)); |
31856 | 192 |
} |
193 |
return true; |
|
194 |
} |
|
195 |
||
196 |
// biased locking and any other IMS exception states take the slow-path |
|
197 |
return false; |
|
198 |
} |
|
199 |
||
29070 | 200 |
|
201 |
// The LockNode emitted directly at the synchronization site would have |
|
202 |
// been too big if it were to have included support for the cases of inflated |
|
203 |
// recursive enter and exit, so they go here instead. |
|
204 |
// Note that we can't safely call AsyncPrintJavaStack() from within |
|
205 |
// quick_enter() as our thread state remains _in_Java. |
|
206 |
||
207 |
bool ObjectSynchronizer::quick_enter(oop obj, Thread * Self, |
|
37250
2fecd8bdc8e9
8077392: Stream fork/join tasks occasionally fail to complete
dcubed
parents:
37092
diff
changeset
|
208 |
BasicLock * lock) { |
29070 | 209 |
assert(!SafepointSynchronize::is_at_safepoint(), "invariant"); |
210 |
assert(Self->is_Java_thread(), "invariant"); |
|
211 |
assert(((JavaThread *) Self)->thread_state() == _thread_in_Java, "invariant"); |
|
35492
c8c0273e6b91
8146690: Make all classes in GC follow the naming convention.
david
parents:
35171
diff
changeset
|
212 |
NoSafepointVerifier nsv; |
29070 | 213 |
if (obj == NULL) return false; // Need to throw NPE |
214 |
const markOop mark = obj->mark(); |
|
215 |
||
216 |
if (mark->has_monitor()) { |
|
217 |
ObjectMonitor * const m = mark->monitor(); |
|
49658 | 218 |
assert(oopDesc::equals((oop) m->object(), obj), "invariant"); |
29070 | 219 |
Thread * const owner = (Thread *) m->_owner; |
220 |
||
221 |
// Lock contention and Transactional Lock Elision (TLE) diagnostics |
|
222 |
// and observability |
|
223 |
// Case: light contention possibly amenable to TLE |
|
224 |
// Case: TLE inimical operations such as nested/recursive synchronization |
|
225 |
||
226 |
if (owner == Self) { |
|
227 |
m->_recursions++; |
|
228 |
return true; |
|
229 |
} |
|
230 |
||
37250
2fecd8bdc8e9
8077392: Stream fork/join tasks occasionally fail to complete
dcubed
parents:
37092
diff
changeset
|
231 |
// This Java Monitor is inflated so obj's header will never be |
2fecd8bdc8e9
8077392: Stream fork/join tasks occasionally fail to complete
dcubed
parents:
37092
diff
changeset
|
232 |
// displaced to this thread's BasicLock. Make the displaced header |
2fecd8bdc8e9
8077392: Stream fork/join tasks occasionally fail to complete
dcubed
parents:
37092
diff
changeset
|
233 |
// non-NULL so this BasicLock is not seen as recursive nor as |
2fecd8bdc8e9
8077392: Stream fork/join tasks occasionally fail to complete
dcubed
parents:
37092
diff
changeset
|
234 |
// being locked. We do this unconditionally so that this thread's |
2fecd8bdc8e9
8077392: Stream fork/join tasks occasionally fail to complete
dcubed
parents:
37092
diff
changeset
|
235 |
// BasicLock cannot be mis-interpreted by any stack walkers. For |
2fecd8bdc8e9
8077392: Stream fork/join tasks occasionally fail to complete
dcubed
parents:
37092
diff
changeset
|
236 |
// performance reasons, stack walkers generally first check for |
2fecd8bdc8e9
8077392: Stream fork/join tasks occasionally fail to complete
dcubed
parents:
37092
diff
changeset
|
237 |
// Biased Locking in the object's header, the second check is for |
2fecd8bdc8e9
8077392: Stream fork/join tasks occasionally fail to complete
dcubed
parents:
37092
diff
changeset
|
238 |
// stack-locking in the object's header, the third check is for |
2fecd8bdc8e9
8077392: Stream fork/join tasks occasionally fail to complete
dcubed
parents:
37092
diff
changeset
|
239 |
// recursive stack-locking in the displaced header in the BasicLock, |
2fecd8bdc8e9
8077392: Stream fork/join tasks occasionally fail to complete
dcubed
parents:
37092
diff
changeset
|
240 |
// and last are the inflated Java Monitor (ObjectMonitor) checks. |
2fecd8bdc8e9
8077392: Stream fork/join tasks occasionally fail to complete
dcubed
parents:
37092
diff
changeset
|
241 |
lock->set_displaced_header(markOopDesc::unused_mark()); |
2fecd8bdc8e9
8077392: Stream fork/join tasks occasionally fail to complete
dcubed
parents:
37092
diff
changeset
|
242 |
|
48488 | 243 |
if (owner == NULL && Atomic::replace_if_null(Self, &(m->_owner))) { |
29070 | 244 |
assert(m->_recursions == 0, "invariant"); |
245 |
assert(m->_owner == Self, "invariant"); |
|
246 |
return true; |
|
247 |
} |
|
248 |
} |
|
249 |
||
250 |
// Note that we could inflate in quick_enter. |
|
251 |
// This is likely a useful optimization |
|
252 |
// Critically, in quick_enter() we must not: |
|
253 |
// -- perform bias revocation, or |
|
254 |
// -- block indefinitely, or |
|
255 |
// -- reach a safepoint |
|
256 |
||
257 |
return false; // revert to slow-path |
|
258 |
} |
|
259 |
||
6975 | 260 |
// ----------------------------------------------------------------------------- |
261 |
// Fast Monitor Enter/Exit |
|
262 |
// This the fast monitor enter. The interpreter and compiler use |
|
263 |
// some assembly copies of this code. Make sure update those code |
|
264 |
// if the following function is changed. The implementation is |
|
265 |
// extremely sensitive to race condition. Be careful. |
|
266 |
||
26684
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
267 |
void ObjectSynchronizer::fast_enter(Handle obj, BasicLock* lock, |
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
268 |
bool attempt_rebias, TRAPS) { |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
269 |
if (UseBiasedLocking) { |
6975 | 270 |
if (!SafepointSynchronize::is_at_safepoint()) { |
271 |
BiasedLocking::Condition cond = BiasedLocking::revoke_and_rebias(obj, attempt_rebias, THREAD); |
|
272 |
if (cond == BiasedLocking::BIAS_REVOKED_AND_REBIASED) { |
|
273 |
return; |
|
274 |
} |
|
275 |
} else { |
|
276 |
assert(!attempt_rebias, "can not rebias toward VM thread"); |
|
277 |
BiasedLocking::revoke_at_safepoint(obj); |
|
278 |
} |
|
279 |
assert(!obj->mark()->has_bias_pattern(), "biases should be revoked by now"); |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
280 |
} |
6975 | 281 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
282 |
slow_enter(obj, lock, THREAD); |
6975 | 283 |
} |
284 |
||
285 |
void ObjectSynchronizer::fast_exit(oop object, BasicLock* lock, TRAPS) { |
|
37251
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
286 |
markOop mark = object->mark(); |
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
287 |
// We cannot check for Biased Locking if we are racing an inflation. |
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
288 |
assert(mark == markOopDesc::INFLATING() || |
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
289 |
!mark->has_bias_pattern(), "should not see bias pattern here"); |
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
290 |
|
6975 | 291 |
markOop dhw = lock->displaced_header(); |
292 |
if (dhw == NULL) { |
|
37251
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
293 |
// If the displaced header is NULL, then this exit matches up with |
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
294 |
// a recursive enter. No real work to do here except for diagnostics. |
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
295 |
#ifndef PRODUCT |
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
296 |
if (mark != markOopDesc::INFLATING()) { |
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
297 |
// Only do diagnostics if we are not racing an inflation. Simply |
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
298 |
// exiting a recursive enter of a Java Monitor that is being |
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
299 |
// inflated is safe; see the has_monitor() comment below. |
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
300 |
assert(!mark->is_neutral(), "invariant"); |
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
301 |
assert(!mark->has_locker() || |
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
302 |
THREAD->is_lock_owned((address)mark->locker()), "invariant"); |
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
303 |
if (mark->has_monitor()) { |
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
304 |
// The BasicLock's displaced_header is marked as a recursive |
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
305 |
// enter and we have an inflated Java Monitor (ObjectMonitor). |
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
306 |
// This is a special case where the Java Monitor was inflated |
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
307 |
// after this thread entered the stack-lock recursively. When a |
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
308 |
// Java Monitor is inflated, we cannot safely walk the Java |
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
309 |
// Monitor owner's stack and update the BasicLocks because a |
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
310 |
// Java Monitor can be asynchronously inflated by a thread that |
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
311 |
// does not own the Java Monitor. |
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
312 |
ObjectMonitor * m = mark->monitor(); |
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
313 |
assert(((oop)(m->object()))->mark() == mark, "invariant"); |
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
314 |
assert(m->is_entered(THREAD), "invariant"); |
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
315 |
} |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
316 |
} |
37251
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
317 |
#endif |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
318 |
return; |
6975 | 319 |
} |
320 |
||
321 |
if (mark == (markOop) lock) { |
|
37251
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
322 |
// If the object is stack-locked by the current thread, try to |
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
323 |
// swing the displaced header from the BasicLock back to the mark. |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
324 |
assert(dhw->is_neutral(), "invariant"); |
46678
9b8b0fe92c93
8184181: Use oopDesc::cas_set_mark() instead of raw CAS when accessing oop header
rkennke
parents:
46625
diff
changeset
|
325 |
if (object->cas_set_mark(dhw, mark) == mark) { |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
326 |
return; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
327 |
} |
6975 | 328 |
} |
329 |
||
37251
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
330 |
// We have to take the slow-path of possible inflation and then exit. |
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
331 |
inflate(THREAD, object, inflate_cause_vm_internal)->exit(true, THREAD); |
6975 | 332 |
} |
333 |
||
334 |
// ----------------------------------------------------------------------------- |
|
335 |
// Interpreter/Compiler Slow Case |
|
336 |
// This routine is used to handle interpreter/compiler slow case |
|
337 |
// We don't need to use fast path here, because it must have been |
|
338 |
// failed in the interpreter/compiler code. |
|
339 |
void ObjectSynchronizer::slow_enter(Handle obj, BasicLock* lock, TRAPS) { |
|
340 |
markOop mark = obj->mark(); |
|
341 |
assert(!mark->has_bias_pattern(), "should not see bias pattern here"); |
|
342 |
||
343 |
if (mark->is_neutral()) { |
|
344 |
// Anticipate successful CAS -- the ST of the displaced mark must |
|
345 |
// be visible <= the ST performed by the CAS. |
|
346 |
lock->set_displaced_header(mark); |
|
46678
9b8b0fe92c93
8184181: Use oopDesc::cas_set_mark() instead of raw CAS when accessing oop header
rkennke
parents:
46625
diff
changeset
|
347 |
if (mark == obj()->cas_set_mark((markOop) lock, mark)) { |
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
348 |
return; |
6975 | 349 |
} |
350 |
// Fall through to inflate() ... |
|
26684
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
351 |
} else if (mark->has_locker() && |
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
352 |
THREAD->is_lock_owned((address)mark->locker())) { |
6975 | 353 |
assert(lock != mark->locker(), "must not re-lock the same lock"); |
354 |
assert(lock != (BasicLock*)obj->mark(), "don't relock with same BasicLock"); |
|
355 |
lock->set_displaced_header(NULL); |
|
356 |
return; |
|
357 |
} |
|
358 |
||
359 |
// The object header will never be displaced to this lock, |
|
360 |
// so it does not matter what the value is, except that it |
|
361 |
// must be non-zero to avoid looking like a re-entrant lock, |
|
362 |
// and must not look locked either. |
|
363 |
lock->set_displaced_header(markOopDesc::unused_mark()); |
|
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
364 |
inflate(THREAD, obj(), inflate_cause_monitor_enter)->enter(THREAD); |
6975 | 365 |
} |
366 |
||
367 |
// This routine is used to handle interpreter/compiler slow case |
|
368 |
// We don't need to use fast path here, because it must have |
|
369 |
// failed in the interpreter/compiler code. Simply use the heavy |
|
370 |
// weight monitor should be ok, unless someone find otherwise. |
|
371 |
void ObjectSynchronizer::slow_exit(oop object, BasicLock* lock, TRAPS) { |
|
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
372 |
fast_exit(object, lock, THREAD); |
6975 | 373 |
} |
374 |
||
375 |
// ----------------------------------------------------------------------------- |
|
376 |
// Class Loader support to workaround deadlocks on the class loader lock objects |
|
377 |
// Also used by GC |
|
378 |
// complete_exit()/reenter() are used to wait on a nested lock |
|
379 |
// i.e. to give up an outer lock completely and then re-enter |
|
380 |
// Used when holding nested locks - lock acquisition order: lock1 then lock2 |
|
381 |
// 1) complete_exit lock1 - saving recursion count |
|
382 |
// 2) wait on lock2 |
|
383 |
// 3) when notified on lock2, unlock lock2 |
|
384 |
// 4) reenter lock1 with original recursion count |
|
385 |
// 5) lock lock2 |
|
386 |
// NOTE: must use heavy weight monitor to handle complete_exit/reenter() |
|
387 |
intptr_t ObjectSynchronizer::complete_exit(Handle obj, TRAPS) { |
|
388 |
if (UseBiasedLocking) { |
|
389 |
BiasedLocking::revoke_and_rebias(obj, false, THREAD); |
|
390 |
assert(!obj->mark()->has_bias_pattern(), "biases should be revoked by now"); |
|
1 | 391 |
} |
392 |
||
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
393 |
ObjectMonitor* monitor = inflate(THREAD, obj(), inflate_cause_vm_internal); |
6975 | 394 |
|
395 |
return monitor->complete_exit(THREAD); |
|
396 |
} |
|
397 |
||
398 |
// NOTE: must use heavy weight monitor to handle complete_exit/reenter() |
|
399 |
void ObjectSynchronizer::reenter(Handle obj, intptr_t recursion, TRAPS) { |
|
400 |
if (UseBiasedLocking) { |
|
401 |
BiasedLocking::revoke_and_rebias(obj, false, THREAD); |
|
402 |
assert(!obj->mark()->has_bias_pattern(), "biases should be revoked by now"); |
|
403 |
} |
|
404 |
||
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
405 |
ObjectMonitor* monitor = inflate(THREAD, obj(), inflate_cause_vm_internal); |
6975 | 406 |
|
407 |
monitor->reenter(recursion, THREAD); |
|
408 |
} |
|
409 |
// ----------------------------------------------------------------------------- |
|
410 |
// JNI locks on java objects |
|
411 |
// NOTE: must use heavy weight monitor to handle jni monitor enter |
|
26684
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
412 |
void ObjectSynchronizer::jni_enter(Handle obj, TRAPS) { |
6975 | 413 |
// the current locking is from JNI instead of Java code |
414 |
if (UseBiasedLocking) { |
|
415 |
BiasedLocking::revoke_and_rebias(obj, false, THREAD); |
|
416 |
assert(!obj->mark()->has_bias_pattern(), "biases should be revoked by now"); |
|
417 |
} |
|
418 |
THREAD->set_current_pending_monitor_is_from_java(false); |
|
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
419 |
inflate(THREAD, obj(), inflate_cause_jni_enter)->enter(THREAD); |
6975 | 420 |
THREAD->set_current_pending_monitor_is_from_java(true); |
421 |
} |
|
422 |
||
423 |
// NOTE: must use heavy weight monitor to handle jni monitor exit |
|
424 |
void ObjectSynchronizer::jni_exit(oop obj, Thread* THREAD) { |
|
425 |
if (UseBiasedLocking) { |
|
15233
c06b129cf6c7
6444286: Possible naked oop related to biased locking revocation safepoint in jni_exit()
dcubed
parents:
14583
diff
changeset
|
426 |
Handle h_obj(THREAD, obj); |
c06b129cf6c7
6444286: Possible naked oop related to biased locking revocation safepoint in jni_exit()
dcubed
parents:
14583
diff
changeset
|
427 |
BiasedLocking::revoke_and_rebias(h_obj, false, THREAD); |
c06b129cf6c7
6444286: Possible naked oop related to biased locking revocation safepoint in jni_exit()
dcubed
parents:
14583
diff
changeset
|
428 |
obj = h_obj(); |
6975 | 429 |
} |
430 |
assert(!obj->mark()->has_bias_pattern(), "biases should be revoked by now"); |
|
431 |
||
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
432 |
ObjectMonitor* monitor = inflate(THREAD, obj, inflate_cause_jni_exit); |
6975 | 433 |
// If this thread has locked the object, exit the monitor. Note: can't use |
434 |
// monitor->check(CHECK); must exit even if an exception is pending. |
|
435 |
if (monitor->check(THREAD)) { |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
436 |
monitor->exit(true, THREAD); |
1 | 437 |
} |
6975 | 438 |
} |
439 |
||
440 |
// ----------------------------------------------------------------------------- |
|
441 |
// Internal VM locks on java objects |
|
442 |
// standard constructor, allows locking failures |
|
443 |
ObjectLocker::ObjectLocker(Handle obj, Thread* thread, bool doLock) { |
|
444 |
_dolock = doLock; |
|
445 |
_thread = thread; |
|
446 |
debug_only(if (StrictSafepointChecks) _thread->check_for_valid_safepoint_state(false);) |
|
447 |
_obj = obj; |
|
1 | 448 |
|
6975 | 449 |
if (_dolock) { |
450 |
ObjectSynchronizer::fast_enter(_obj, &_lock, false, _thread); |
|
451 |
} |
|
452 |
} |
|
453 |
||
454 |
ObjectLocker::~ObjectLocker() { |
|
455 |
if (_dolock) { |
|
456 |
ObjectSynchronizer::fast_exit(_obj(), &_lock, _thread); |
|
457 |
} |
|
458 |
} |
|
1 | 459 |
|
460 |
||
6975 | 461 |
// ----------------------------------------------------------------------------- |
462 |
// Wait/Notify/NotifyAll |
|
463 |
// NOTE: must use heavy weight monitor to handle wait() |
|
22743
e043208c9d93
8030808: dtrace/hotspot/Monitors/Monitors001 fails in product builds on solaris-sparc
fparain
parents:
22551
diff
changeset
|
464 |
int ObjectSynchronizer::wait(Handle obj, jlong millis, TRAPS) { |
6975 | 465 |
if (UseBiasedLocking) { |
466 |
BiasedLocking::revoke_and_rebias(obj, false, THREAD); |
|
467 |
assert(!obj->mark()->has_bias_pattern(), "biases should be revoked by now"); |
|
468 |
} |
|
469 |
if (millis < 0) { |
|
22743
e043208c9d93
8030808: dtrace/hotspot/Monitors/Monitors001 fails in product builds on solaris-sparc
fparain
parents:
22551
diff
changeset
|
470 |
THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); |
6975 | 471 |
} |
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
472 |
ObjectMonitor* monitor = inflate(THREAD, obj(), inflate_cause_wait); |
35934
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
473 |
|
6975 | 474 |
DTRACE_MONITOR_WAIT_PROBE(monitor, obj(), THREAD, millis); |
475 |
monitor->wait(millis, true, THREAD); |
|
476 |
||
22743
e043208c9d93
8030808: dtrace/hotspot/Monitors/Monitors001 fails in product builds on solaris-sparc
fparain
parents:
22551
diff
changeset
|
477 |
// This dummy call is in place to get around dtrace bug 6254741. Once |
e043208c9d93
8030808: dtrace/hotspot/Monitors/Monitors001 fails in product builds on solaris-sparc
fparain
parents:
22551
diff
changeset
|
478 |
// that's fixed we can uncomment the following line, remove the call |
e043208c9d93
8030808: dtrace/hotspot/Monitors/Monitors001 fails in product builds on solaris-sparc
fparain
parents:
22551
diff
changeset
|
479 |
// and change this function back into a "void" func. |
6975 | 480 |
// DTRACE_MONITOR_PROBE(waited, monitor, obj(), THREAD); |
22743
e043208c9d93
8030808: dtrace/hotspot/Monitors/Monitors001 fails in product builds on solaris-sparc
fparain
parents:
22551
diff
changeset
|
481 |
return dtrace_waited_probe(monitor, obj, THREAD); |
6975 | 482 |
} |
1 | 483 |
|
26684
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
484 |
void ObjectSynchronizer::waitUninterruptibly(Handle obj, jlong millis, TRAPS) { |
6975 | 485 |
if (UseBiasedLocking) { |
486 |
BiasedLocking::revoke_and_rebias(obj, false, THREAD); |
|
487 |
assert(!obj->mark()->has_bias_pattern(), "biases should be revoked by now"); |
|
488 |
} |
|
489 |
if (millis < 0) { |
|
490 |
THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); |
|
491 |
} |
|
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
492 |
inflate(THREAD, obj(), inflate_cause_wait)->wait(millis, false, THREAD); |
6975 | 493 |
} |
494 |
||
495 |
void ObjectSynchronizer::notify(Handle obj, TRAPS) { |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
496 |
if (UseBiasedLocking) { |
6975 | 497 |
BiasedLocking::revoke_and_rebias(obj, false, THREAD); |
498 |
assert(!obj->mark()->has_bias_pattern(), "biases should be revoked by now"); |
|
499 |
} |
|
1 | 500 |
|
6975 | 501 |
markOop mark = obj->mark(); |
502 |
if (mark->has_locker() && THREAD->is_lock_owned((address)mark->locker())) { |
|
503 |
return; |
|
504 |
} |
|
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
505 |
inflate(THREAD, obj(), inflate_cause_notify)->notify(THREAD); |
6975 | 506 |
} |
1 | 507 |
|
6975 | 508 |
// NOTE: see comment of notify() |
509 |
void ObjectSynchronizer::notifyall(Handle obj, TRAPS) { |
|
510 |
if (UseBiasedLocking) { |
|
511 |
BiasedLocking::revoke_and_rebias(obj, false, THREAD); |
|
512 |
assert(!obj->mark()->has_bias_pattern(), "biases should be revoked by now"); |
|
513 |
} |
|
514 |
||
515 |
markOop mark = obj->mark(); |
|
516 |
if (mark->has_locker() && THREAD->is_lock_owned((address)mark->locker())) { |
|
517 |
return; |
|
518 |
} |
|
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
519 |
inflate(THREAD, obj(), inflate_cause_notify)->notifyAll(THREAD); |
6975 | 520 |
} |
521 |
||
522 |
// ----------------------------------------------------------------------------- |
|
523 |
// Hash Code handling |
|
524 |
// |
|
1 | 525 |
// Performance concern: |
25633
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
526 |
// OrderAccess::storestore() calls release() which at one time stored 0 |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
527 |
// into the global volatile OrderAccess::dummy variable. This store was |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
528 |
// unnecessary for correctness. Many threads storing into a common location |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
529 |
// causes considerable cache migration or "sloshing" on large SMP systems. |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
530 |
// As such, I avoided using OrderAccess::storestore(). In some cases |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
531 |
// OrderAccess::fence() -- which incurs local latency on the executing |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
532 |
// processor -- is a better choice as it scales on SMP systems. |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
533 |
// |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
534 |
// See http://blogs.oracle.com/dave/entry/biased_locking_in_hotspot for |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
535 |
// a discussion of coherency costs. Note that all our current reference |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
536 |
// platforms provide strong ST-ST order, so the issue is moot on IA32, |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
537 |
// x64, and SPARC. |
1 | 538 |
// |
539 |
// As a general policy we use "volatile" to control compiler-based reordering |
|
25633
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
540 |
// and explicit fences (barriers) to control for architectural reordering |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
541 |
// performed by the CPU(s) or platform. |
1 | 542 |
|
543 |
struct SharedGlobals { |
|
27165
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
544 |
char _pad_prefix[DEFAULT_CACHE_LINE_SIZE]; |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
545 |
// These are highly shared mostly-read variables. |
27165
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
546 |
// To avoid false-sharing they need to be the sole occupants of a cache line. |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
547 |
volatile int stwRandom; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
548 |
volatile int stwCycle; |
27165
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
549 |
DEFINE_PAD_MINUS_SIZE(1, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile int) * 2); |
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
550 |
// Hot RW variable -- Sequester to avoid false-sharing |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
551 |
volatile int hcSequence; |
27165
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
552 |
DEFINE_PAD_MINUS_SIZE(2, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile int)); |
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
553 |
}; |
1 | 554 |
|
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
555 |
static SharedGlobals GVars; |
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
556 |
static int MonitorScavengeThreshold = 1000000; |
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
557 |
static volatile int ForceMonitorScavenge = 0; // Scavenge required and pending |
1 | 558 |
|
26684
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
559 |
static markOop ReadStableMark(oop obj) { |
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
560 |
markOop mark = obj->mark(); |
6975 | 561 |
if (!mark->is_being_inflated()) { |
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
562 |
return mark; // normal fast-path return |
6975 | 563 |
} |
1 | 564 |
|
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
565 |
int its = 0; |
6975 | 566 |
for (;;) { |
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
567 |
markOop mark = obj->mark(); |
6975 | 568 |
if (!mark->is_being_inflated()) { |
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
569 |
return mark; // normal fast-path return |
6975 | 570 |
} |
571 |
||
572 |
// The object is being inflated by some other thread. |
|
573 |
// The caller of ReadStableMark() must wait for inflation to complete. |
|
574 |
// Avoid live-lock |
|
575 |
// TODO: consider calling SafepointSynchronize::do_call_back() while |
|
576 |
// spinning to see if there's a safepoint pending. If so, immediately |
|
577 |
// yielding or blocking would be appropriate. Avoid spinning while |
|
578 |
// there is a safepoint pending. |
|
579 |
// TODO: add inflation contention performance counters. |
|
580 |
// TODO: restrict the aggregate number of spinners. |
|
1 | 581 |
|
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
582 |
++its; |
6975 | 583 |
if (its > 10000 || !os::is_MP()) { |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
584 |
if (its & 1) { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
585 |
os::naked_yield(); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
586 |
} else { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
587 |
// Note that the following code attenuates the livelock problem but is not |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
588 |
// a complete remedy. A more complete solution would require that the inflating |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
589 |
// thread hold the associated inflation lock. The following code simply restricts |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
590 |
// the number of spinners to at most one. We'll have N-2 threads blocked |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
591 |
// on the inflationlock, 1 thread holding the inflation lock and using |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
592 |
// a yield/park strategy, and 1 thread in the midst of inflation. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
593 |
// A more refined approach would be to change the encoding of INFLATING |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
594 |
// to allow encapsulation of a native thread pointer. Threads waiting for |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
595 |
// inflation to complete would use CAS to push themselves onto a singly linked |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
596 |
// list rooted at the markword. Once enqueued, they'd loop, checking a per-thread flag |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
597 |
// and calling park(). When inflation was complete the thread that accomplished inflation |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
598 |
// would detach the list and set the markword to inflated with a single CAS and |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
599 |
// then for each thread on the list, set the flag and unpark() the thread. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
600 |
// This is conceptually similar to muxAcquire-muxRelease, except that muxRelease |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
601 |
// wakes at most one thread whereas we need to wake the entire list. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
602 |
int ix = (cast_from_oop<intptr_t>(obj) >> 5) & (NINFLATIONLOCKS-1); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
603 |
int YieldThenBlock = 0; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
604 |
assert(ix >= 0 && ix < NINFLATIONLOCKS, "invariant"); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
605 |
assert((NINFLATIONLOCKS & (NINFLATIONLOCKS-1)) == 0, "invariant"); |
30244 | 606 |
Thread::muxAcquire(gInflationLocks + ix, "gInflationLock"); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
607 |
while (obj->mark() == markOopDesc::INFLATING()) { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
608 |
// Beware: NakedYield() is advisory and has almost no effect on some platforms |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
609 |
// so we periodically call Self->_ParkEvent->park(1). |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
610 |
// We use a mixed spin/yield/block mechanism. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
611 |
if ((YieldThenBlock++) >= 16) { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
612 |
Thread::current()->_ParkEvent->park(1); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
613 |
} else { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
614 |
os::naked_yield(); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
615 |
} |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
616 |
} |
30244 | 617 |
Thread::muxRelease(gInflationLocks + ix); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
618 |
} |
6975 | 619 |
} else { |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
620 |
SpinPause(); // SMP-polite spinning |
6975 | 621 |
} |
622 |
} |
|
623 |
} |
|
1 | 624 |
|
625 |
// hashCode() generation : |
|
626 |
// |
|
627 |
// Possibilities: |
|
628 |
// * MD5Digest of {obj,stwRandom} |
|
629 |
// * CRC32 of {obj,stwRandom} or any linear-feedback shift register function. |
|
630 |
// * A DES- or AES-style SBox[] mechanism |
|
631 |
// * One of the Phi-based schemes, such as: |
|
632 |
// 2654435761 = 2^32 * Phi (golden ratio) |
|
633 |
// HashCodeValue = ((uintptr_t(obj) >> 3) * 2654435761) ^ GVars.stwRandom ; |
|
634 |
// * A variation of Marsaglia's shift-xor RNG scheme. |
|
635 |
// * (obj ^ stwRandom) is appealing, but can result |
|
636 |
// in undesirable regularity in the hashCode values of adjacent objects |
|
637 |
// (objects allocated back-to-back, in particular). This could potentially |
|
638 |
// result in hashtable collisions and reduced hashtable efficiency. |
|
639 |
// There are simple ways to "diffuse" the middle address bits over the |
|
640 |
// generated hashCode values: |
|
641 |
||
642 |
static inline intptr_t get_next_hash(Thread * Self, oop obj) { |
|
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
643 |
intptr_t value = 0; |
1 | 644 |
if (hashCode == 0) { |
46587
6c97f34cb194
8182554: Code for os::random() assumes long is 32 bits
coleenp
parents:
46541
diff
changeset
|
645 |
// This form uses global Park-Miller RNG. |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
646 |
// On MP system we'll have lots of RW access to a global, so the |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
647 |
// mechanism induces lots of coherency traffic. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
648 |
value = os::random(); |
26684
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
649 |
} else if (hashCode == 1) { |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
650 |
// This variation has the property of being stable (idempotent) |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
651 |
// between STW operations. This can be useful in some of the 1-0 |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
652 |
// synchronization schemes. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
653 |
intptr_t addrBits = cast_from_oop<intptr_t>(obj) >> 3; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
654 |
value = addrBits ^ (addrBits >> 5) ^ GVars.stwRandom; |
26684
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
655 |
} else if (hashCode == 2) { |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
656 |
value = 1; // for sensitivity testing |
26684
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
657 |
} else if (hashCode == 3) { |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
658 |
value = ++GVars.hcSequence; |
26684
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
659 |
} else if (hashCode == 4) { |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
660 |
value = cast_from_oop<intptr_t>(obj); |
1 | 661 |
} else { |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
662 |
// Marsaglia's xor-shift scheme with thread-specific state |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
663 |
// This is probably the best overall implementation -- we'll |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
664 |
// likely make this the default in future releases. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
665 |
unsigned t = Self->_hashStateX; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
666 |
t ^= (t << 11); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
667 |
Self->_hashStateX = Self->_hashStateY; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
668 |
Self->_hashStateY = Self->_hashStateZ; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
669 |
Self->_hashStateZ = Self->_hashStateW; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
670 |
unsigned v = Self->_hashStateW; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
671 |
v = (v ^ (v >> 19)) ^ (t ^ (t >> 8)); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
672 |
Self->_hashStateW = v; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
673 |
value = v; |
1 | 674 |
} |
675 |
||
676 |
value &= markOopDesc::hash_mask; |
|
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
677 |
if (value == 0) value = 0xBAD; |
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
678 |
assert(value != markOopDesc::no_hash, "invariant"); |
1 | 679 |
return value; |
680 |
} |
|
26684
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
681 |
|
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
682 |
intptr_t ObjectSynchronizer::FastHashCode(Thread * Self, oop obj) { |
6975 | 683 |
if (UseBiasedLocking) { |
684 |
// NOTE: many places throughout the JVM do not expect a safepoint |
|
685 |
// to be taken here, in particular most operations on perm gen |
|
686 |
// objects. However, we only ever bias Java instances and all of |
|
687 |
// the call sites of identity_hash that might revoke biases have |
|
688 |
// been checked to make sure they can handle a safepoint. The |
|
689 |
// added check of the bias pattern is to avoid useless calls to |
|
690 |
// thread-local storage. |
|
691 |
if (obj->mark()->has_bias_pattern()) { |
|
25472
381638db28e6
8047104: cleanup misc issues prior to Contended Locking reorder and cache
dcubed
parents:
25468
diff
changeset
|
692 |
// Handle for oop obj in case of STW safepoint |
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
693 |
Handle hobj(Self, obj); |
6975 | 694 |
// Relaxing assertion for bug 6320749. |
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
695 |
assert(Universe::verify_in_progress() || |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
696 |
!SafepointSynchronize::is_at_safepoint(), |
6975 | 697 |
"biases should not be seen by VM thread here"); |
698 |
BiasedLocking::revoke_and_rebias(hobj, false, JavaThread::current()); |
|
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
699 |
obj = hobj(); |
6975 | 700 |
assert(!obj->mark()->has_bias_pattern(), "biases should be revoked by now"); |
701 |
} |
|
702 |
} |
|
1 | 703 |
|
6975 | 704 |
// hashCode() is a heap mutator ... |
705 |
// Relaxing assertion for bug 6320749. |
|
31345
1bba15125d8d
8015086: add interned strings to the shared archive.
jiangli
parents:
30244
diff
changeset
|
706 |
assert(Universe::verify_in_progress() || DumpSharedSpaces || |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
707 |
!SafepointSynchronize::is_at_safepoint(), "invariant"); |
31345
1bba15125d8d
8015086: add interned strings to the shared archive.
jiangli
parents:
30244
diff
changeset
|
708 |
assert(Universe::verify_in_progress() || DumpSharedSpaces || |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
709 |
Self->is_Java_thread() , "invariant"); |
31345
1bba15125d8d
8015086: add interned strings to the shared archive.
jiangli
parents:
30244
diff
changeset
|
710 |
assert(Universe::verify_in_progress() || DumpSharedSpaces || |
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
711 |
((JavaThread *)Self)->thread_state() != _thread_blocked, "invariant"); |
6975 | 712 |
|
713 |
ObjectMonitor* monitor = NULL; |
|
714 |
markOop temp, test; |
|
715 |
intptr_t hash; |
|
26684
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
716 |
markOop mark = ReadStableMark(obj); |
6975 | 717 |
|
718 |
// object should remain ineligible for biased locking |
|
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
719 |
assert(!mark->has_bias_pattern(), "invariant"); |
6975 | 720 |
|
721 |
if (mark->is_neutral()) { |
|
722 |
hash = mark->hash(); // this is a normal header |
|
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
723 |
if (hash != 0) { // if it has hash, just return it |
6975 | 724 |
return hash; |
725 |
} |
|
726 |
hash = get_next_hash(Self, obj); // allocate a new hash code |
|
727 |
temp = mark->copy_set_hash(hash); // merge the hash code into header |
|
728 |
// use (machine word version) atomic operation to install the hash |
|
46678
9b8b0fe92c93
8184181: Use oopDesc::cas_set_mark() instead of raw CAS when accessing oop header
rkennke
parents:
46625
diff
changeset
|
729 |
test = obj->cas_set_mark(temp, mark); |
6975 | 730 |
if (test == mark) { |
731 |
return hash; |
|
732 |
} |
|
733 |
// If atomic operation failed, we must inflate the header |
|
734 |
// into heavy weight monitor. We could add more code here |
|
735 |
// for fast path, but it does not worth the complexity. |
|
736 |
} else if (mark->has_monitor()) { |
|
737 |
monitor = mark->monitor(); |
|
738 |
temp = monitor->header(); |
|
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
739 |
assert(temp->is_neutral(), "invariant: header=" INTPTR_FORMAT, p2i(temp)); |
6975 | 740 |
hash = temp->hash(); |
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
741 |
if (hash != 0) { |
6975 | 742 |
return hash; |
743 |
} |
|
744 |
// Skip to the following code to reduce code size |
|
745 |
} else if (Self->is_lock_owned((address)mark->locker())) { |
|
746 |
temp = mark->displaced_mark_helper(); // this is a lightweight monitor owned |
|
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
747 |
assert(temp->is_neutral(), "invariant: header=" INTPTR_FORMAT, p2i(temp)); |
6975 | 748 |
hash = temp->hash(); // by current thread, check if the displaced |
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
749 |
if (hash != 0) { // header contains hash code |
6975 | 750 |
return hash; |
751 |
} |
|
752 |
// WARNING: |
|
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
753 |
// The displaced header in the BasicLock on a thread's stack |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
754 |
// is strictly immutable. It CANNOT be changed in ANY cases. |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
755 |
// So we have to inflate the stack lock into an ObjectMonitor |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
756 |
// even if the current thread owns the lock. The BasicLock on |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
757 |
// a thread's stack can be asynchronously read by other threads |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
758 |
// during an inflate() call so any change to that stack memory |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
759 |
// may not propagate to other threads correctly. |
6975 | 760 |
} |
761 |
||
762 |
// Inflate the monitor to set hash code |
|
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
763 |
monitor = inflate(Self, obj, inflate_cause_hash_code); |
6975 | 764 |
// Load displaced header and check it has hash code |
765 |
mark = monitor->header(); |
|
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
766 |
assert(mark->is_neutral(), "invariant: header=" INTPTR_FORMAT, p2i(mark)); |
6975 | 767 |
hash = mark->hash(); |
768 |
if (hash == 0) { |
|
769 |
hash = get_next_hash(Self, obj); |
|
770 |
temp = mark->copy_set_hash(hash); // merge hash code into header |
|
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
771 |
assert(temp->is_neutral(), "invariant: header=" INTPTR_FORMAT, p2i(temp)); |
47634
6a0c42c40cd1
8188220: Remove Atomic::*_ptr() uses and overloads from hotspot
coleenp
parents:
47216
diff
changeset
|
772 |
test = Atomic::cmpxchg(temp, monitor->header_addr(), mark); |
6975 | 773 |
if (test != mark) { |
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
774 |
// The only update to the ObjectMonitor's header/dmw field |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
775 |
// is to merge in the hash code. If someone adds a new usage |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
776 |
// of the header/dmw field, please update this code. |
6975 | 777 |
hash = test->hash(); |
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
778 |
assert(test->is_neutral(), "invariant: header=" INTPTR_FORMAT, p2i(test)); |
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
779 |
assert(hash != 0, "Trivial unexpected object/monitor header usage."); |
6975 | 780 |
} |
781 |
} |
|
782 |
// We finally get the hash |
|
783 |
return hash; |
|
1 | 784 |
} |
785 |
||
6975 | 786 |
// Deprecated -- use FastHashCode() instead. |
1 | 787 |
|
6975 | 788 |
intptr_t ObjectSynchronizer::identity_hash_value_for(Handle obj) { |
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
789 |
return FastHashCode(Thread::current(), obj()); |
1 | 790 |
} |
791 |
||
792 |
||
6975 | 793 |
bool ObjectSynchronizer::current_thread_holds_lock(JavaThread* thread, |
794 |
Handle h_obj) { |
|
795 |
if (UseBiasedLocking) { |
|
796 |
BiasedLocking::revoke_and_rebias(h_obj, false, thread); |
|
797 |
assert(!h_obj->mark()->has_bias_pattern(), "biases should be revoked by now"); |
|
798 |
} |
|
799 |
||
800 |
assert(thread == JavaThread::current(), "Can only be called on current thread"); |
|
801 |
oop obj = h_obj(); |
|
802 |
||
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
803 |
markOop mark = ReadStableMark(obj); |
1 | 804 |
|
6975 | 805 |
// Uncontended case, header points to stack |
806 |
if (mark->has_locker()) { |
|
807 |
return thread->is_lock_owned((address)mark->locker()); |
|
1 | 808 |
} |
6975 | 809 |
// Contended case, header points to ObjectMonitor (tagged pointer) |
810 |
if (mark->has_monitor()) { |
|
811 |
ObjectMonitor* monitor = mark->monitor(); |
|
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
812 |
return monitor->is_entered(thread) != 0; |
1 | 813 |
} |
6975 | 814 |
// Unlocked case, header in place |
815 |
assert(mark->is_neutral(), "sanity check"); |
|
816 |
return false; |
|
1 | 817 |
} |
818 |
||
6975 | 819 |
// Be aware of this method could revoke bias of the lock object. |
22551 | 820 |
// This method queries the ownership of the lock handle specified by 'h_obj'. |
6975 | 821 |
// If the current thread owns the lock, it returns owner_self. If no |
822 |
// thread owns the lock, it returns owner_none. Otherwise, it will return |
|
22551 | 823 |
// owner_other. |
6975 | 824 |
ObjectSynchronizer::LockOwnership ObjectSynchronizer::query_lock_ownership |
825 |
(JavaThread *self, Handle h_obj) { |
|
826 |
// The caller must beware this method can revoke bias, and |
|
827 |
// revocation can result in a safepoint. |
|
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
828 |
assert(!SafepointSynchronize::is_at_safepoint(), "invariant"); |
26684
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
829 |
assert(self->thread_state() != _thread_blocked, "invariant"); |
1 | 830 |
|
6975 | 831 |
// Possible mark states: neutral, biased, stack-locked, inflated |
832 |
||
833 |
if (UseBiasedLocking && h_obj()->mark()->has_bias_pattern()) { |
|
834 |
// CASE: biased |
|
835 |
BiasedLocking::revoke_and_rebias(h_obj, false, self); |
|
836 |
assert(!h_obj->mark()->has_bias_pattern(), |
|
837 |
"biases should be revoked by now"); |
|
838 |
} |
|
1 | 839 |
|
6975 | 840 |
assert(self == JavaThread::current(), "Can only be called on current thread"); |
841 |
oop obj = h_obj(); |
|
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
842 |
markOop mark = ReadStableMark(obj); |
6975 | 843 |
|
844 |
// CASE: stack-locked. Mark points to a BasicLock on the owner's stack. |
|
845 |
if (mark->has_locker()) { |
|
846 |
return self->is_lock_owned((address)mark->locker()) ? |
|
847 |
owner_self : owner_other; |
|
848 |
} |
|
1 | 849 |
|
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
850 |
// CASE: inflated. Mark (tagged pointer) points to an ObjectMonitor. |
6975 | 851 |
// The Object:ObjectMonitor relationship is stable as long as we're |
852 |
// not at a safepoint. |
|
853 |
if (mark->has_monitor()) { |
|
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
854 |
void * owner = mark->monitor()->_owner; |
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
855 |
if (owner == NULL) return owner_none; |
6975 | 856 |
return (owner == self || |
857 |
self->is_lock_owned((address)owner)) ? owner_self : owner_other; |
|
858 |
} |
|
859 |
||
860 |
// CASE: neutral |
|
861 |
assert(mark->is_neutral(), "sanity check"); |
|
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
862 |
return owner_none; // it's unlocked |
6975 | 863 |
} |
1 | 864 |
|
6975 | 865 |
// FIXME: jvmti should call this |
48105
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents:
47634
diff
changeset
|
866 |
JavaThread* ObjectSynchronizer::get_lock_owner(ThreadsList * t_list, Handle h_obj) { |
6975 | 867 |
if (UseBiasedLocking) { |
868 |
if (SafepointSynchronize::is_at_safepoint()) { |
|
869 |
BiasedLocking::revoke_at_safepoint(h_obj); |
|
870 |
} else { |
|
871 |
BiasedLocking::revoke_and_rebias(h_obj, false, JavaThread::current()); |
|
872 |
} |
|
873 |
assert(!h_obj->mark()->has_bias_pattern(), "biases should be revoked by now"); |
|
874 |
} |
|
875 |
||
876 |
oop obj = h_obj(); |
|
877 |
address owner = NULL; |
|
878 |
||
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
879 |
markOop mark = ReadStableMark(obj); |
6975 | 880 |
|
881 |
// Uncontended case, header points to stack |
|
882 |
if (mark->has_locker()) { |
|
883 |
owner = (address) mark->locker(); |
|
884 |
} |
|
885 |
||
886 |
// Contended case, header points to ObjectMonitor (tagged pointer) |
|
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
887 |
else if (mark->has_monitor()) { |
6975 | 888 |
ObjectMonitor* monitor = mark->monitor(); |
889 |
assert(monitor != NULL, "monitor should be non-null"); |
|
890 |
owner = (address) monitor->owner(); |
|
891 |
} |
|
892 |
||
893 |
if (owner != NULL) { |
|
15853
1c4e16950e96
8007476: assert(the_owner != NULL) failed: Did not find owning Java thread for lock word address
dcubed
parents:
15475
diff
changeset
|
894 |
// owning_thread_from_monitor_owner() may also return NULL here |
48105
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents:
47634
diff
changeset
|
895 |
return Threads::owning_thread_from_monitor_owner(t_list, owner); |
6975 | 896 |
} |
897 |
||
898 |
// Unlocked case, header in place |
|
899 |
// Cannot have assertion since this object may have been |
|
900 |
// locked by another thread when reaching here. |
|
901 |
// assert(mark->is_neutral(), "sanity check"); |
|
902 |
||
903 |
return NULL; |
|
904 |
} |
|
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
905 |
|
6975 | 906 |
// Visitors ... |
907 |
||
908 |
void ObjectSynchronizer::monitors_iterate(MonitorClosure* closure) { |
|
47634
6a0c42c40cd1
8188220: Remove Atomic::*_ptr() uses and overloads from hotspot
coleenp
parents:
47216
diff
changeset
|
909 |
PaddedEnd<ObjectMonitor> * block = OrderAccess::load_acquire(&gBlockList); |
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
910 |
while (block != NULL) { |
6975 | 911 |
assert(block->object() == CHAINMARKER, "must be a block header"); |
912 |
for (int i = _BLOCKSIZE - 1; i > 0; i--) { |
|
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
913 |
ObjectMonitor* mid = (ObjectMonitor *)(block + i); |
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
914 |
oop object = (oop)mid->object(); |
6975 | 915 |
if (object != NULL) { |
916 |
closure->do_monitor(mid); |
|
917 |
} |
|
918 |
} |
|
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
919 |
block = (PaddedEnd<ObjectMonitor> *)block->FreeNext; |
1 | 920 |
} |
921 |
} |
|
922 |
||
6975 | 923 |
// Get the next block in the block list. |
47634
6a0c42c40cd1
8188220: Remove Atomic::*_ptr() uses and overloads from hotspot
coleenp
parents:
47216
diff
changeset
|
924 |
static inline PaddedEnd<ObjectMonitor>* next(PaddedEnd<ObjectMonitor>* block) { |
6975 | 925 |
assert(block->object() == CHAINMARKER, "must be a block header"); |
47634
6a0c42c40cd1
8188220: Remove Atomic::*_ptr() uses and overloads from hotspot
coleenp
parents:
47216
diff
changeset
|
926 |
block = (PaddedEnd<ObjectMonitor>*) block->FreeNext; |
6975 | 927 |
assert(block == NULL || block->object() == CHAINMARKER, "must be a block header"); |
928 |
return block; |
|
1 | 929 |
} |
930 |
||
46541
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
931 |
static bool monitors_used_above_threshold() { |
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
932 |
if (gMonitorPopulation == 0) { |
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
933 |
return false; |
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
934 |
} |
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
935 |
int monitors_used = gMonitorPopulation - gMonitorFreeCount; |
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
936 |
int monitor_usage = (monitors_used * 100LL) / gMonitorPopulation; |
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
937 |
return monitor_usage > MonitorUsedDeflationThreshold; |
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
938 |
} |
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
939 |
|
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
940 |
bool ObjectSynchronizer::is_cleanup_needed() { |
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
941 |
if (MonitorUsedDeflationThreshold > 0) { |
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
942 |
return monitors_used_above_threshold(); |
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
943 |
} |
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
944 |
return false; |
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
945 |
} |
1 | 946 |
|
6975 | 947 |
void ObjectSynchronizer::oops_do(OopClosure* f) { |
51998
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
948 |
// We only scan the global used list here (for moribund threads), and |
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
949 |
// the thread-local monitors in Thread::oops_do(). |
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
950 |
global_used_oops_do(f); |
1 | 951 |
} |
952 |
||
46474
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
953 |
void ObjectSynchronizer::global_used_oops_do(OopClosure* f) { |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
954 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
955 |
list_oops_do(gOmInUseList, f); |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
956 |
} |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
957 |
|
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
958 |
void ObjectSynchronizer::thread_local_used_oops_do(Thread* thread, OopClosure* f) { |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
959 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
960 |
list_oops_do(thread->omInUseList, f); |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
961 |
} |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
962 |
|
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
963 |
void ObjectSynchronizer::list_oops_do(ObjectMonitor* list, OopClosure* f) { |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
964 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
965 |
ObjectMonitor* mid; |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
966 |
for (mid = list; mid != NULL; mid = mid->FreeNext) { |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
967 |
if (mid->object() != NULL) { |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
968 |
f->do_oop((oop*)mid->object_addr()); |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
969 |
} |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
970 |
} |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
971 |
} |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
972 |
|
1 | 973 |
|
6975 | 974 |
// ----------------------------------------------------------------------------- |
1 | 975 |
// ObjectMonitor Lifecycle |
976 |
// ----------------------- |
|
977 |
// Inflation unlinks monitors from the global gFreeList and |
|
978 |
// associates them with objects. Deflation -- which occurs at |
|
979 |
// STW-time -- disassociates idle monitors from objects. Such |
|
980 |
// scavenged monitors are returned to the gFreeList. |
|
981 |
// |
|
30244 | 982 |
// The global list is protected by gListLock. All the critical sections |
1 | 983 |
// are short and operate in constant-time. |
984 |
// |
|
985 |
// ObjectMonitors reside in type-stable memory (TSM) and are immortal. |
|
986 |
// |
|
987 |
// Lifecycle: |
|
988 |
// -- unassigned and on the global free list |
|
989 |
// -- unassigned and on a thread's private omFreeList |
|
990 |
// -- assigned to an object. The object is inflated and the mark refers |
|
991 |
// to the objectmonitor. |
|
992 |
||
993 |
||
5710 | 994 |
// Constraining monitor pool growth via MonitorBound ... |
995 |
// |
|
996 |
// The monitor pool is grow-only. We scavenge at STW safepoint-time, but the |
|
997 |
// the rate of scavenging is driven primarily by GC. As such, we can find |
|
998 |
// an inordinate number of monitors in circulation. |
|
999 |
// To avoid that scenario we can artificially induce a STW safepoint |
|
1000 |
// if the pool appears to be growing past some reasonable bound. |
|
1001 |
// Generally we favor time in space-time tradeoffs, but as there's no |
|
1002 |
// natural back-pressure on the # of extant monitors we need to impose some |
|
1003 |
// type of limit. Beware that if MonitorBound is set to too low a value |
|
1004 |
// we could just loop. In addition, if MonitorBound is set to a low value |
|
1005 |
// we'll incur more safepoints, which are harmful to performance. |
|
1006 |
// See also: GuaranteedSafepointInterval |
|
1007 |
// |
|
1008 |
// The current implementation uses asynchronous VM operations. |
|
1009 |
||
26684
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
1010 |
static void InduceScavenge(Thread * Self, const char * Whence) { |
5710 | 1011 |
// Induce STW safepoint to trim monitors |
1012 |
// Ultimately, this results in a call to deflate_idle_monitors() in the near future. |
|
1013 |
// More precisely, trigger an asynchronous STW safepoint as the number |
|
1014 |
// of active monitors passes the specified threshold. |
|
1015 |
// TODO: assert thread state is reasonable |
|
1016 |
||
1017 |
if (ForceMonitorScavenge == 0 && Atomic::xchg (1, &ForceMonitorScavenge) == 0) { |
|
1018 |
// Induce a 'null' safepoint to scavenge monitors |
|
1019 |
// Must VM_Operation instance be heap allocated as the op will be enqueue and posted |
|
1020 |
// to the VMthread and have a lifespan longer than that of this activation record. |
|
1021 |
// The VMThread will delete the op when completed. |
|
46495
34f7d403039f
8152953: ForceSafepoint operations should be more specific
rehn
parents:
46484
diff
changeset
|
1022 |
VMThread::execute(new VM_ScavengeMonitors()); |
5710 | 1023 |
} |
1024 |
} |
|
25472
381638db28e6
8047104: cleanup misc issues prior to Contended Locking reorder and cache
dcubed
parents:
25468
diff
changeset
|
1025 |
|
37092
0e56e3c9d545
8151593: Cleanup definition/usage of INLINE/NOINLINE macros and add xlC support
simonis
parents:
35934
diff
changeset
|
1026 |
ObjectMonitor* ObjectSynchronizer::omAlloc(Thread * Self) { |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1027 |
// A large MAXPRIVATE value reduces both list lock contention |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1028 |
// and list coherency traffic, but also tends to increase the |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1029 |
// number of objectMonitors in circulation as well as the STW |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1030 |
// scavenge costs. As usual, we lean toward time in space-time |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1031 |
// tradeoffs. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1032 |
const int MAXPRIVATE = 1024; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1033 |
for (;;) { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1034 |
ObjectMonitor * m; |
1 | 1035 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1036 |
// 1: try to allocate from the thread's local omFreeList. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1037 |
// Threads will attempt to allocate first from their local list, then |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1038 |
// from the global list, and only after those attempts fail will the thread |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1039 |
// attempt to instantiate new monitors. Thread-local free lists take |
30244 | 1040 |
// heat off the gListLock and improve allocation latency, as well as reducing |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1041 |
// coherency traffic on the shared global list. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1042 |
m = Self->omFreeList; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1043 |
if (m != NULL) { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1044 |
Self->omFreeList = m->FreeNext; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1045 |
Self->omFreeCount--; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1046 |
guarantee(m->object() == NULL, "invariant"); |
51998
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1047 |
m->FreeNext = Self->omInUseList; |
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1048 |
Self->omInUseList = m; |
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1049 |
Self->omInUseCount++; |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1050 |
return m; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1051 |
} |
1 | 1052 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1053 |
// 2: try to allocate from the global gFreeList |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1054 |
// CONSIDER: use muxTry() instead of muxAcquire(). |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1055 |
// If the muxTry() fails then drop immediately into case 3. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1056 |
// If we're using thread-local free lists then try |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1057 |
// to reprovision the caller's free list. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1058 |
if (gFreeList != NULL) { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1059 |
// Reprovision the thread's omFreeList. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1060 |
// Use bulk transfers to reduce the allocation rate and heat |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1061 |
// on various locks. |
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
1062 |
Thread::muxAcquire(&gListLock, "omAlloc(1)"); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1063 |
for (int i = Self->omFreeProvision; --i >= 0 && gFreeList != NULL;) { |
30244 | 1064 |
gMonitorFreeCount--; |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1065 |
ObjectMonitor * take = gFreeList; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1066 |
gFreeList = take->FreeNext; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1067 |
guarantee(take->object() == NULL, "invariant"); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1068 |
guarantee(!take->is_busy(), "invariant"); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1069 |
take->Recycle(); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1070 |
omRelease(Self, take, false); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1071 |
} |
30244 | 1072 |
Thread::muxRelease(&gListLock); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1073 |
Self->omFreeProvision += 1 + (Self->omFreeProvision/2); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1074 |
if (Self->omFreeProvision > MAXPRIVATE) Self->omFreeProvision = MAXPRIVATE; |
5710 | 1075 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1076 |
const int mx = MonitorBound; |
30244 | 1077 |
if (mx > 0 && (gMonitorPopulation-gMonitorFreeCount) > mx) { |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1078 |
// We can't safely induce a STW safepoint from omAlloc() as our thread |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1079 |
// state may not be appropriate for such activities and callers may hold |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1080 |
// naked oops, so instead we defer the action. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1081 |
InduceScavenge(Self, "omAlloc"); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1082 |
} |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1083 |
continue; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1084 |
} |
1 | 1085 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1086 |
// 3: allocate a block of new ObjectMonitors |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1087 |
// Both the local and global free lists are empty -- resort to malloc(). |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1088 |
// In the current implementation objectMonitors are TSM - immortal. |
27165
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
1089 |
// Ideally, we'd write "new ObjectMonitor[_BLOCKSIZE], but we want |
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
1090 |
// each ObjectMonitor to start at the beginning of a cache line, |
46619
a3919f5e8d2b
8178499: Remove _ptr_ and _size_ infixes from align functions
stefank
parents:
46618
diff
changeset
|
1091 |
// so we use align_up(). |
27165
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
1092 |
// A better solution would be to use C++ placement-new. |
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
1093 |
// BEWARE: As it stands currently, we don't run the ctors! |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1094 |
assert(_BLOCKSIZE > 1, "invariant"); |
27165
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
1095 |
size_t neededsize = sizeof(PaddedEnd<ObjectMonitor>) * _BLOCKSIZE; |
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
1096 |
PaddedEnd<ObjectMonitor> * temp; |
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
1097 |
size_t aligned_size = neededsize + (DEFAULT_CACHE_LINE_SIZE - 1); |
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
1098 |
void* real_malloc_addr = (void *)NEW_C_HEAP_ARRAY(char, aligned_size, |
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
1099 |
mtInternal); |
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
1100 |
temp = (PaddedEnd<ObjectMonitor> *) |
46619
a3919f5e8d2b
8178499: Remove _ptr_ and _size_ infixes from align functions
stefank
parents:
46618
diff
changeset
|
1101 |
align_up(real_malloc_addr, DEFAULT_CACHE_LINE_SIZE); |
1 | 1102 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1103 |
// NOTE: (almost) no way to recover if allocation failed. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1104 |
// We might be able to induce a STW safepoint and scavenge enough |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1105 |
// objectMonitors to permit progress. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1106 |
if (temp == NULL) { |
27165
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
1107 |
vm_exit_out_of_memory(neededsize, OOM_MALLOC_ERROR, |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1108 |
"Allocate ObjectMonitors"); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1109 |
} |
27165
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
1110 |
(void)memset((void *) temp, 0, neededsize); |
1 | 1111 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1112 |
// Format the block. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1113 |
// initialize the linked list, each monitor points to its next |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1114 |
// forming the single linked free list, the very first monitor |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1115 |
// will points to next block, which forms the block list. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1116 |
// The trick of using the 1st element in the block as gBlockList |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1117 |
// linkage should be reconsidered. A better implementation would |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1118 |
// look like: class Block { Block * next; int N; ObjectMonitor Body [N] ; } |
1 | 1119 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1120 |
for (int i = 1; i < _BLOCKSIZE; i++) { |
27165
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
1121 |
temp[i].FreeNext = (ObjectMonitor *)&temp[i+1]; |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1122 |
} |
1 | 1123 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1124 |
// terminate the last monitor as the end of list |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1125 |
temp[_BLOCKSIZE - 1].FreeNext = NULL; |
1 | 1126 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1127 |
// Element [0] is reserved for global list linkage |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1128 |
temp[0].set_object(CHAINMARKER); |
1 | 1129 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1130 |
// Consider carving out this thread's current request from the |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1131 |
// block in hand. This avoids some lock traffic and redundant |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1132 |
// list activity. |
1 | 1133 |
|
30244 | 1134 |
// Acquire the gListLock to manipulate gBlockList and gFreeList. |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1135 |
// An Oyama-Taura-Yonezawa scheme might be more efficient. |
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
1136 |
Thread::muxAcquire(&gListLock, "omAlloc(2)"); |
30244 | 1137 |
gMonitorPopulation += _BLOCKSIZE-1; |
1138 |
gMonitorFreeCount += _BLOCKSIZE-1; |
|
1 | 1139 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1140 |
// Add the new block to the list of extant blocks (gBlockList). |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1141 |
// The very first objectMonitor in a block is reserved and dedicated. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1142 |
// It serves as blocklist "next" linkage. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1143 |
temp[0].FreeNext = gBlockList; |
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1144 |
// There are lock-free uses of gBlockList so make sure that |
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1145 |
// the previous stores happen before we update gBlockList. |
47634
6a0c42c40cd1
8188220: Remove Atomic::*_ptr() uses and overloads from hotspot
coleenp
parents:
47216
diff
changeset
|
1146 |
OrderAccess::release_store(&gBlockList, temp); |
1 | 1147 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1148 |
// Add the new string of objectMonitors to the global free list |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1149 |
temp[_BLOCKSIZE - 1].FreeNext = gFreeList; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1150 |
gFreeList = temp + 1; |
30244 | 1151 |
Thread::muxRelease(&gListLock); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1152 |
} |
1 | 1153 |
} |
1154 |
||
1155 |
// Place "m" on the caller's private per-thread omFreeList. |
|
1156 |
// In practice there's no need to clamp or limit the number of |
|
1157 |
// monitors on a thread's omFreeList as the only time we'll call |
|
1158 |
// omRelease is to return a monitor to the free list after a CAS |
|
1159 |
// attempt failed. This doesn't allow unbounded #s of monitors to |
|
1160 |
// accumulate on a thread's free list. |
|
30244 | 1161 |
// |
1162 |
// Key constraint: all ObjectMonitors on a thread's free list and the global |
|
1163 |
// free list must have their object field set to null. This prevents the |
|
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
1164 |
// scavenger -- deflate_monitor_list() -- from reclaiming them. |
1 | 1165 |
|
26684
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
1166 |
void ObjectSynchronizer::omRelease(Thread * Self, ObjectMonitor * m, |
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
1167 |
bool fromPerThreadAlloc) { |
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
1168 |
guarantee(m->header() == NULL, "invariant"); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1169 |
guarantee(m->object() == NULL, "invariant"); |
30244 | 1170 |
guarantee(((m->is_busy()|m->_recursions) == 0), "freeing in-use monitor"); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1171 |
// Remove from omInUseList |
51998
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1172 |
if (fromPerThreadAlloc) { |
30244 | 1173 |
ObjectMonitor* cur_mid_in_use = NULL; |
1174 |
bool extracted = false; |
|
1175 |
for (ObjectMonitor* mid = Self->omInUseList; mid != NULL; cur_mid_in_use = mid, mid = mid->FreeNext) { |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1176 |
if (m == mid) { |
30244 | 1177 |
// extract from per-thread in-use list |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1178 |
if (mid == Self->omInUseList) { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1179 |
Self->omInUseList = mid->FreeNext; |
30244 | 1180 |
} else if (cur_mid_in_use != NULL) { |
1181 |
cur_mid_in_use->FreeNext = mid->FreeNext; // maintain the current thread in-use list |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1182 |
} |
30244 | 1183 |
extracted = true; |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1184 |
Self->omInUseCount--; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1185 |
break; |
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1186 |
} |
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1187 |
} |
30244 | 1188 |
assert(extracted, "Should have extracted from in-use list"); |
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1189 |
} |
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1190 |
|
25472
381638db28e6
8047104: cleanup misc issues prior to Contended Locking reorder and cache
dcubed
parents:
25468
diff
changeset
|
1191 |
// FreeNext is used for both omInUseList and omFreeList, so clear old before setting new |
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
1192 |
m->FreeNext = Self->omFreeList; |
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
1193 |
Self->omFreeList = m; |
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
1194 |
Self->omFreeCount++; |
1 | 1195 |
} |
1196 |
||
1197 |
// Return the monitors of a moribund thread's local free list to |
|
1198 |
// the global free list. Typically a thread calls omFlush() when |
|
1199 |
// it's dying. We could also consider having the VM thread steal |
|
1200 |
// monitors from threads that have not run java code over a few |
|
1201 |
// consecutive STW safepoints. Relatedly, we might decay |
|
1202 |
// omFreeProvision at STW safepoints. |
|
1203 |
// |
|
25472
381638db28e6
8047104: cleanup misc issues prior to Contended Locking reorder and cache
dcubed
parents:
25468
diff
changeset
|
1204 |
// Also return the monitors of a moribund thread's omInUseList to |
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1205 |
// a global gOmInUseList under the global list lock so these |
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1206 |
// will continue to be scanned. |
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1207 |
// |
46484
688e3a206b86
8180599: Possibly miss to iterate monitors on thread exit
rkennke
parents:
46474
diff
changeset
|
1208 |
// We currently call omFlush() from Threads::remove() _before the thread |
1 | 1209 |
// has been excised from the thread list and is no longer a mutator. |
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
1210 |
// This means that omFlush() cannot run concurrently with a safepoint and |
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
1211 |
// interleave with the deflate_idle_monitors scavenge operator. In particular, |
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
1212 |
// this ensures that the thread's monitors are scanned by a GC safepoint, |
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
1213 |
// either via Thread::oops_do() (if safepoint happens before omFlush()) or via |
46484
688e3a206b86
8180599: Possibly miss to iterate monitors on thread exit
rkennke
parents:
46474
diff
changeset
|
1214 |
// ObjectSynchronizer::oops_do() (if it happens after omFlush() and the thread's |
688e3a206b86
8180599: Possibly miss to iterate monitors on thread exit
rkennke
parents:
46474
diff
changeset
|
1215 |
// monitors have been transferred to the global in-use list). |
1 | 1216 |
|
26684
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
1217 |
void ObjectSynchronizer::omFlush(Thread * Self) { |
30244 | 1218 |
ObjectMonitor * list = Self->omFreeList; // Null-terminated SLL |
1219 |
ObjectMonitor * tail = NULL; |
|
1220 |
int tally = 0; |
|
1221 |
if (list != NULL) { |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1222 |
ObjectMonitor * s; |
30244 | 1223 |
// The thread is going away, the per-thread free monitors |
1224 |
// are freed via set_owner(NULL) |
|
1225 |
// Link them to tail, which will be linked into the global free list |
|
1226 |
// gFreeList below, under the gListLock |
|
1227 |
for (s = list; s != NULL; s = s->FreeNext) { |
|
1228 |
tally++; |
|
1229 |
tail = s; |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1230 |
guarantee(s->object() == NULL, "invariant"); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1231 |
guarantee(!s->is_busy(), "invariant"); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1232 |
s->set_owner(NULL); // redundant but good hygiene |
1 | 1233 |
} |
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
1234 |
guarantee(tail != NULL, "invariant"); |
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
1235 |
assert(Self->omFreeCount == tally, "free-count off"); |
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
1236 |
Self->omFreeList = NULL; |
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
1237 |
Self->omFreeCount = 0; |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1238 |
} |
1 | 1239 |
|
30244 | 1240 |
ObjectMonitor * inUseList = Self->omInUseList; |
1241 |
ObjectMonitor * inUseTail = NULL; |
|
1242 |
int inUseTally = 0; |
|
1243 |
if (inUseList != NULL) { |
|
1244 |
ObjectMonitor *cur_om; |
|
1245 |
// The thread is going away, however the omInUseList inflated |
|
1246 |
// monitors may still be in-use by other threads. |
|
1247 |
// Link them to inUseTail, which will be linked into the global in-use list |
|
1248 |
// gOmInUseList below, under the gListLock |
|
1249 |
for (cur_om = inUseList; cur_om != NULL; cur_om = cur_om->FreeNext) { |
|
1250 |
inUseTail = cur_om; |
|
1251 |
inUseTally++; |
|
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1252 |
} |
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
1253 |
guarantee(inUseTail != NULL, "invariant"); |
30244 | 1254 |
assert(Self->omInUseCount == inUseTally, "in-use count off"); |
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
1255 |
Self->omInUseList = NULL; |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1256 |
Self->omInUseCount = 0; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1257 |
} |
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1258 |
|
30244 | 1259 |
Thread::muxAcquire(&gListLock, "omFlush"); |
1260 |
if (tail != NULL) { |
|
1261 |
tail->FreeNext = gFreeList; |
|
1262 |
gFreeList = list; |
|
1263 |
gMonitorFreeCount += tally; |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1264 |
} |
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1265 |
|
30244 | 1266 |
if (inUseTail != NULL) { |
1267 |
inUseTail->FreeNext = gOmInUseList; |
|
1268 |
gOmInUseList = inUseList; |
|
1269 |
gOmInUseCount += inUseTally; |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1270 |
} |
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1271 |
|
30244 | 1272 |
Thread::muxRelease(&gListLock); |
54291
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1273 |
|
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1274 |
LogStreamHandle(Debug, monitorinflation) lsh_debug; |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1275 |
LogStreamHandle(Info, monitorinflation) lsh_info; |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1276 |
LogStream * ls = NULL; |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1277 |
if (log_is_enabled(Debug, monitorinflation)) { |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1278 |
ls = &lsh_debug; |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1279 |
} else if ((tally != 0 || inUseTally != 0) && |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1280 |
log_is_enabled(Info, monitorinflation)) { |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1281 |
ls = &lsh_info; |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1282 |
} |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1283 |
if (ls != NULL) { |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1284 |
ls->print_cr("omFlush: jt=" INTPTR_FORMAT ", free_monitor_tally=%d" |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1285 |
", in_use_monitor_tally=%d" ", omFreeProvision=%d", |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1286 |
p2i(Self), tally, inUseTally, Self->omFreeProvision); |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1287 |
} |
1 | 1288 |
} |
1289 |
||
50113 | 1290 |
static void post_monitor_inflate_event(EventJavaMonitorInflate* event, |
1291 |
const oop obj, |
|
1292 |
ObjectSynchronizer::InflateCause cause) { |
|
1293 |
assert(event != NULL, "invariant"); |
|
1294 |
assert(event->should_commit(), "invariant"); |
|
1295 |
event->set_monitorClass(obj->klass()); |
|
1296 |
event->set_address((uintptr_t)(void*)obj); |
|
1297 |
event->set_cause((u1)cause); |
|
1298 |
event->commit(); |
|
1299 |
} |
|
1300 |
||
1 | 1301 |
// Fast path code shared by multiple functions |
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
1302 |
void ObjectSynchronizer::inflate_helper(oop obj) { |
1 | 1303 |
markOop mark = obj->mark(); |
1304 |
if (mark->has_monitor()) { |
|
1305 |
assert(ObjectSynchronizer::verify_objmon_isinpool(mark->monitor()), "monitor is invalid"); |
|
1306 |
assert(mark->monitor()->header()->is_neutral(), "monitor must record a good object header"); |
|
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
1307 |
return; |
1 | 1308 |
} |
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
1309 |
inflate(Thread::current(), obj, inflate_cause_vm_internal); |
1 | 1310 |
} |
1311 |
||
37092
0e56e3c9d545
8151593: Cleanup definition/usage of INLINE/NOINLINE macros and add xlC support
simonis
parents:
35934
diff
changeset
|
1312 |
ObjectMonitor* ObjectSynchronizer::inflate(Thread * Self, |
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
1313 |
oop object, |
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
1314 |
const InflateCause cause) { |
1 | 1315 |
// Inflate mutates the heap ... |
1316 |
// Relaxing assertion for bug 6320749. |
|
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
1317 |
assert(Universe::verify_in_progress() || |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1318 |
!SafepointSynchronize::is_at_safepoint(), "invariant"); |
1 | 1319 |
|
35934
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1320 |
EventJavaMonitorInflate event; |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1321 |
|
1 | 1322 |
for (;;) { |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1323 |
const markOop mark = object->mark(); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1324 |
assert(!mark->has_bias_pattern(), "invariant"); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1325 |
|
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1326 |
// The mark can be in one of the following states: |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1327 |
// * Inflated - just return |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1328 |
// * Stack-locked - coerce it to inflated |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1329 |
// * INFLATING - busy wait for conversion to complete |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1330 |
// * Neutral - aggressively inflate the object. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1331 |
// * BIASED - Illegal. We should never see this |
1 | 1332 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1333 |
// CASE: inflated |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1334 |
if (mark->has_monitor()) { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1335 |
ObjectMonitor * inf = mark->monitor(); |
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
1336 |
markOop dmw = inf->header(); |
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1337 |
assert(dmw->is_neutral(), "invariant: header=" INTPTR_FORMAT, p2i(dmw)); |
49658 | 1338 |
assert(oopDesc::equals((oop) inf->object(), object), "invariant"); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1339 |
assert(ObjectSynchronizer::verify_objmon_isinpool(inf), "monitor is invalid"); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1340 |
return inf; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1341 |
} |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1342 |
|
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1343 |
// CASE: inflation in progress - inflating over a stack-lock. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1344 |
// Some other thread is converting from stack-locked to inflated. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1345 |
// Only that thread can complete inflation -- other threads must wait. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1346 |
// The INFLATING value is transient. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1347 |
// Currently, we spin/yield/park and poll the markword, waiting for inflation to finish. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1348 |
// We could always eliminate polling by parking the thread on some auxiliary list. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1349 |
if (mark == markOopDesc::INFLATING()) { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1350 |
ReadStableMark(object); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1351 |
continue; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1352 |
} |
1 | 1353 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1354 |
// CASE: stack-locked |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1355 |
// Could be stack-locked either by this thread or by some other thread. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1356 |
// |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1357 |
// Note that we allocate the objectmonitor speculatively, _before_ attempting |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1358 |
// to install INFLATING into the mark word. We originally installed INFLATING, |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1359 |
// allocated the objectmonitor, and then finally STed the address of the |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1360 |
// objectmonitor into the mark. This was correct, but artificially lengthened |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1361 |
// the interval in which INFLATED appeared in the mark, thus increasing |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1362 |
// the odds of inflation contention. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1363 |
// |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1364 |
// We now use per-thread private objectmonitor free lists. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1365 |
// These list are reprovisioned from the global free list outside the |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1366 |
// critical INFLATING...ST interval. A thread can transfer |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1367 |
// multiple objectmonitors en-mass from the global free list to its local free list. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1368 |
// This reduces coherency traffic and lock contention on the global free list. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1369 |
// Using such local free lists, it doesn't matter if the omAlloc() call appears |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1370 |
// before or after the CAS(INFLATING) operation. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1371 |
// See the comments in omAlloc(). |
1 | 1372 |
|
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1373 |
LogStreamHandle(Trace, monitorinflation) lsh; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1374 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1375 |
if (mark->has_locker()) { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1376 |
ObjectMonitor * m = omAlloc(Self); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1377 |
// Optimistically prepare the objectmonitor - anticipate successful CAS |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1378 |
// We do this before the CAS in order to minimize the length of time |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1379 |
// in which INFLATING appears in the mark. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1380 |
m->Recycle(); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1381 |
m->_Responsible = NULL; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1382 |
m->_recursions = 0; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1383 |
m->_SpinDuration = ObjectMonitor::Knob_SpinLimit; // Consider: maintain by type/class |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1384 |
|
46678
9b8b0fe92c93
8184181: Use oopDesc::cas_set_mark() instead of raw CAS when accessing oop header
rkennke
parents:
46625
diff
changeset
|
1385 |
markOop cmp = object->cas_set_mark(markOopDesc::INFLATING(), mark); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1386 |
if (cmp != mark) { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1387 |
omRelease(Self, m, true); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1388 |
continue; // Interference -- just retry |
1 | 1389 |
} |
1390 |
||
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1391 |
// We've successfully installed INFLATING (0) into the mark-word. |
32623
390a27af5657
8134626: Misc cleanups after generation array removal
jwilhelm
parents:
32614
diff
changeset
|
1392 |
// This is the only case where 0 will appear in a mark-word. |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1393 |
// Only the singular thread that successfully swings the mark-word |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1394 |
// to 0 can perform (or more precisely, complete) inflation. |
1 | 1395 |
// |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1396 |
// Why do we CAS a 0 into the mark-word instead of just CASing the |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1397 |
// mark-word from the stack-locked value directly to the new inflated state? |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1398 |
// Consider what happens when a thread unlocks a stack-locked object. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1399 |
// It attempts to use CAS to swing the displaced header value from the |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1400 |
// on-stack basiclock back into the object header. Recall also that the |
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1401 |
// header value (hash code, etc) can reside in (a) the object header, or |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1402 |
// (b) a displaced header associated with the stack-lock, or (c) a displaced |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1403 |
// header in an objectMonitor. The inflate() routine must copy the header |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1404 |
// value from the basiclock on the owner's stack to the objectMonitor, all |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1405 |
// the while preserving the hashCode stability invariants. If the owner |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1406 |
// decides to release the lock while the value is 0, the unlock will fail |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1407 |
// and control will eventually pass from slow_exit() to inflate. The owner |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1408 |
// will then spin, waiting for the 0 value to disappear. Put another way, |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1409 |
// the 0 causes the owner to stall if the owner happens to try to |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1410 |
// drop the lock (restoring the header from the basiclock to the object) |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1411 |
// while inflation is in-progress. This protocol avoids races that might |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1412 |
// would otherwise permit hashCode values to change or "flicker" for an object. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1413 |
// Critically, while object->mark is 0 mark->displaced_mark_helper() is stable. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1414 |
// 0 serves as a "BUSY" inflate-in-progress indicator. |
1 | 1415 |
|
1416 |
||
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1417 |
// fetch the displaced mark from the owner's stack. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1418 |
// The owner can't die or unwind past the lock while our INFLATING |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1419 |
// object is in the mark. Furthermore the owner can't complete |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1420 |
// an unlock on the object, either. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1421 |
markOop dmw = mark->displaced_mark_helper(); |
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1422 |
// Catch if the object's header is not neutral (not locked and |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1423 |
// not marked is what we care about here). |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1424 |
assert(dmw->is_neutral(), "invariant: header=" INTPTR_FORMAT, p2i(dmw)); |
1 | 1425 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1426 |
// Setup monitor fields to proper values -- prepare the monitor |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1427 |
m->set_header(dmw); |
1 | 1428 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1429 |
// Optimization: if the mark->locker stack address is associated |
27165
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
1430 |
// with this thread we could simply set m->_owner = Self. |
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
1431 |
// Note that a thread can inflate an object |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1432 |
// that it has stack-locked -- as might happen in wait() -- directly |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1433 |
// with CAS. That is, we can avoid the xchg-NULL .... ST idiom. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1434 |
m->set_owner(mark->locker()); |
1 | 1435 |
m->set_object(object); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1436 |
// TODO-FIXME: assert BasicLock->dhw != 0. |
1 | 1437 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1438 |
// Must preserve store ordering. The monitor state must |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1439 |
// be stable at the time of publishing the monitor address. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1440 |
guarantee(object->mark() == markOopDesc::INFLATING(), "invariant"); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1441 |
object->release_set_mark(markOopDesc::encode(m)); |
1 | 1442 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1443 |
// Hopefully the performance counters are allocated on distinct cache lines |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1444 |
// to avoid false sharing on MP systems ... |
32614
b7b2407bc7e5
8049304: race between VM_Exit and _sync_FutileWakeups->inc()
dcubed
parents:
31856
diff
changeset
|
1445 |
OM_PERFDATA_OP(Inflations, inc()); |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1446 |
if (log_is_enabled(Trace, monitorinflation)) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1447 |
ResourceMark rm(Self); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1448 |
lsh.print_cr("inflate(has_locker): object=" INTPTR_FORMAT ", mark=" |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1449 |
INTPTR_FORMAT ", type='%s'", p2i(object), |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1450 |
p2i(object->mark()), object->klass()->external_name()); |
1 | 1451 |
} |
35934
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1452 |
if (event.should_commit()) { |
50113 | 1453 |
post_monitor_inflate_event(&event, object, cause); |
35934
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1454 |
} |
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
1455 |
return m; |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1456 |
} |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1457 |
|
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1458 |
// CASE: neutral |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1459 |
// TODO-FIXME: for entry we currently inflate and then try to CAS _owner. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1460 |
// If we know we're inflating for entry it's better to inflate by swinging a |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1461 |
// pre-locked objectMonitor pointer into the object header. A successful |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1462 |
// CAS inflates the object *and* confers ownership to the inflating thread. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1463 |
// In the current implementation we use a 2-step mechanism where we CAS() |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1464 |
// to inflate and then CAS() again to try to swing _owner from NULL to Self. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1465 |
// An inflateTry() method that we could call from fast_enter() and slow_enter() |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1466 |
// would be useful. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1467 |
|
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1468 |
// Catch if the object's header is not neutral (not locked and |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1469 |
// not marked is what we care about here). |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1470 |
assert(mark->is_neutral(), "invariant: header=" INTPTR_FORMAT, p2i(mark)); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1471 |
ObjectMonitor * m = omAlloc(Self); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1472 |
// prepare m for installation - set monitor to initial state |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1473 |
m->Recycle(); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1474 |
m->set_header(mark); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1475 |
m->set_owner(NULL); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1476 |
m->set_object(object); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1477 |
m->_recursions = 0; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1478 |
m->_Responsible = NULL; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1479 |
m->_SpinDuration = ObjectMonitor::Knob_SpinLimit; // consider: keep metastats by type/class |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1480 |
|
46678
9b8b0fe92c93
8184181: Use oopDesc::cas_set_mark() instead of raw CAS when accessing oop header
rkennke
parents:
46625
diff
changeset
|
1481 |
if (object->cas_set_mark(markOopDesc::encode(m), mark) != mark) { |
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
1482 |
m->set_header(NULL); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1483 |
m->set_object(NULL); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1484 |
m->Recycle(); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1485 |
omRelease(Self, m, true); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1486 |
m = NULL; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1487 |
continue; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1488 |
// interference - the markword changed - just retry. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1489 |
// The state-transitions are one-way, so there's no chance of |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1490 |
// live-lock -- "Inflated" is an absorbing state. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1491 |
} |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1492 |
|
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1493 |
// Hopefully the performance counters are allocated on distinct |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1494 |
// cache lines to avoid false sharing on MP systems ... |
32614
b7b2407bc7e5
8049304: race between VM_Exit and _sync_FutileWakeups->inc()
dcubed
parents:
31856
diff
changeset
|
1495 |
OM_PERFDATA_OP(Inflations, inc()); |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1496 |
if (log_is_enabled(Trace, monitorinflation)) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1497 |
ResourceMark rm(Self); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1498 |
lsh.print_cr("inflate(neutral): object=" INTPTR_FORMAT ", mark=" |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1499 |
INTPTR_FORMAT ", type='%s'", p2i(object), |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1500 |
p2i(object->mark()), object->klass()->external_name()); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1501 |
} |
35934
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1502 |
if (event.should_commit()) { |
50113 | 1503 |
post_monitor_inflate_event(&event, object, cause); |
35934
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1504 |
} |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1505 |
return m; |
1 | 1506 |
} |
1507 |
} |
|
1508 |
||
1509 |
||
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1510 |
// We maintain a list of in-use monitors for each thread. |
1 | 1511 |
// |
51998
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1512 |
// deflate_thread_local_monitors() scans a single thread's in-use list, while |
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1513 |
// deflate_idle_monitors() scans only a global list of in-use monitors which |
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1514 |
// is populated only as a thread dies (see omFlush()). |
5710 | 1515 |
// |
51998
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1516 |
// These operations are called at all safepoints, immediately after mutators |
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1517 |
// are stopped, but before any objects have moved. Collectively they traverse |
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1518 |
// the population of in-use monitors, deflating where possible. The scavenged |
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1519 |
// monitors are returned to the global monitor free list. |
51998
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1520 |
// |
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1521 |
// Beware that we scavenge at *every* stop-the-world point. Having a large |
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1522 |
// number of monitors in-use could negatively impact performance. We also want |
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1523 |
// to minimize the total # of monitors in circulation, as they incur a small |
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1524 |
// footprint penalty. |
1 | 1525 |
// |
1526 |
// Perversely, the heap size -- and thus the STW safepoint rate -- |
|
1527 |
// typically drives the scavenge rate. Large heaps can mean infrequent GC, |
|
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1528 |
// which in turn can mean large(r) numbers of ObjectMonitors in circulation. |
1 | 1529 |
// This is an unfortunate aspect of this design. |
1530 |
||
30244 | 1531 |
// Deflate a single monitor if not in-use |
1532 |
// Return true if deflated, false if in-use |
|
5710 | 1533 |
bool ObjectSynchronizer::deflate_monitor(ObjectMonitor* mid, oop obj, |
26684
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
1534 |
ObjectMonitor** freeHeadp, |
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
1535 |
ObjectMonitor** freeTailp) { |
5710 | 1536 |
bool deflated; |
1537 |
// Normal case ... The monitor is associated with obj. |
|
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1538 |
const markOop mark = obj->mark(); |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1539 |
guarantee(mark == markOopDesc::encode(mid), "should match: mark=" |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1540 |
INTPTR_FORMAT ", encoded mid=" INTPTR_FORMAT, p2i(mark), |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1541 |
p2i(markOopDesc::encode(mid))); |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1542 |
// Make sure that mark->monitor() and markOopDesc::encode() agree: |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1543 |
guarantee(mark->monitor() == mid, "should match: monitor()=" INTPTR_FORMAT |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1544 |
", mid=" INTPTR_FORMAT, p2i(mark->monitor()), p2i(mid)); |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1545 |
const markOop dmw = mid->header(); |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1546 |
guarantee(dmw->is_neutral(), "invariant: header=" INTPTR_FORMAT, p2i(dmw)); |
5710 | 1547 |
|
1548 |
if (mid->is_busy()) { |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1549 |
deflated = false; |
5710 | 1550 |
} else { |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1551 |
// Deflate the monitor if it is no longer being used |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1552 |
// It's idle - scavenge and return to the global free list |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1553 |
// plain old deflation ... |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1554 |
if (log_is_enabled(Trace, monitorinflation)) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1555 |
ResourceMark rm; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1556 |
log_trace(monitorinflation)("deflate_monitor: " |
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1557 |
"object=" INTPTR_FORMAT ", mark=" |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1558 |
INTPTR_FORMAT ", type='%s'", p2i(obj), |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1559 |
p2i(mark), obj->klass()->external_name()); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1560 |
} |
5710 | 1561 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1562 |
// Restore the header back to obj |
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1563 |
obj->release_set_mark(dmw); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1564 |
mid->clear(); |
5710 | 1565 |
|
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1566 |
assert(mid->object() == NULL, "invariant: object=" INTPTR_FORMAT, |
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
1567 |
p2i(mid->object())); |
5710 | 1568 |
|
30244 | 1569 |
// Move the object to the working free list defined by freeHeadp, freeTailp |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1570 |
if (*freeHeadp == NULL) *freeHeadp = mid; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1571 |
if (*freeTailp != NULL) { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1572 |
ObjectMonitor * prevtail = *freeTailp; |
30244 | 1573 |
assert(prevtail->FreeNext == NULL, "cleaned up deflated?"); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1574 |
prevtail->FreeNext = mid; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1575 |
} |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1576 |
*freeTailp = mid; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1577 |
deflated = true; |
5710 | 1578 |
} |
1579 |
return deflated; |
|
1580 |
} |
|
1581 |
||
30244 | 1582 |
// Walk a given monitor list, and deflate idle monitors |
1583 |
// The given list could be a per-thread list or a global list |
|
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
1584 |
// Caller acquires gListLock as needed. |
46702 | 1585 |
// |
1586 |
// In the case of parallel processing of thread local monitor lists, |
|
1587 |
// work is done by Threads::parallel_threads_do() which ensures that |
|
1588 |
// each Java thread is processed by exactly one worker thread, and |
|
1589 |
// thus avoid conflicts that would arise when worker threads would |
|
1590 |
// process the same monitor lists concurrently. |
|
1591 |
// |
|
1592 |
// See also ParallelSPCleanupTask and |
|
46732
05423d4b10d2
8185273: Test8004741.java crashes with SIGSEGV in JDK10-hs nightly
dcubed
parents:
46702
diff
changeset
|
1593 |
// SafepointSynchronize::do_cleanup_tasks() in safepoint.cpp and |
46702 | 1594 |
// Threads::parallel_java_threads_do() in thread.cpp. |
30244 | 1595 |
int ObjectSynchronizer::deflate_monitor_list(ObjectMonitor** listHeadp, |
1596 |
ObjectMonitor** freeHeadp, |
|
1597 |
ObjectMonitor** freeTailp) { |
|
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1598 |
ObjectMonitor* mid; |
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1599 |
ObjectMonitor* next; |
30244 | 1600 |
ObjectMonitor* cur_mid_in_use = NULL; |
1601 |
int deflated_count = 0; |
|
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1602 |
|
30244 | 1603 |
for (mid = *listHeadp; mid != NULL;) { |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1604 |
oop obj = (oop) mid->object(); |
30244 | 1605 |
if (obj != NULL && deflate_monitor(mid, obj, freeHeadp, freeTailp)) { |
1606 |
// if deflate_monitor succeeded, |
|
1607 |
// extract from per-thread in-use list |
|
1608 |
if (mid == *listHeadp) { |
|
1609 |
*listHeadp = mid->FreeNext; |
|
1610 |
} else if (cur_mid_in_use != NULL) { |
|
1611 |
cur_mid_in_use->FreeNext = mid->FreeNext; // maintain the current thread in-use list |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1612 |
} |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1613 |
next = mid->FreeNext; |
30244 | 1614 |
mid->FreeNext = NULL; // This mid is current tail in the freeHeadp list |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1615 |
mid = next; |
30244 | 1616 |
deflated_count++; |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1617 |
} else { |
30244 | 1618 |
cur_mid_in_use = mid; |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1619 |
mid = mid->FreeNext; |
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1620 |
} |
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1621 |
} |
30244 | 1622 |
return deflated_count; |
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1623 |
} |
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1624 |
|
46702 | 1625 |
void ObjectSynchronizer::prepare_deflate_idle_monitors(DeflateMonitorCounters* counters) { |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1626 |
counters->nInuse = 0; // currently associated with objects |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1627 |
counters->nInCirculation = 0; // extant |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1628 |
counters->nScavenged = 0; // reclaimed (global and per-thread) |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1629 |
counters->perThreadScavenged = 0; // per-thread scavenge total |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1630 |
counters->perThreadTimes = 0.0; // per-thread scavenge times |
46702 | 1631 |
} |
1632 |
||
1633 |
void ObjectSynchronizer::deflate_idle_monitors(DeflateMonitorCounters* counters) { |
|
1 | 1634 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
5710 | 1635 |
bool deflated = false; |
1 | 1636 |
|
30244 | 1637 |
ObjectMonitor * freeHeadp = NULL; // Local SLL of scavenged monitors |
1638 |
ObjectMonitor * freeTailp = NULL; |
|
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1639 |
elapsedTimer timer; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1640 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1641 |
if (log_is_enabled(Info, monitorinflation)) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1642 |
timer.start(); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1643 |
} |
1 | 1644 |
|
5710 | 1645 |
// Prevent omFlush from changing mids in Thread dtor's during deflation |
1646 |
// And in case the vm thread is acquiring a lock during a safepoint |
|
1647 |
// See e.g. 6320749 |
|
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
1648 |
Thread::muxAcquire(&gListLock, "deflate_idle_monitors"); |
5710 | 1649 |
|
51998
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1650 |
// Note: the thread-local monitors lists get deflated in |
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1651 |
// a separate pass. See deflate_thread_local_monitors(). |
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1652 |
|
51998
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1653 |
// For moribund threads, scan gOmInUseList |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1654 |
int deflated_count = 0; |
51998
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1655 |
if (gOmInUseList) { |
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1656 |
counters->nInCirculation += gOmInUseCount; |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1657 |
deflated_count = deflate_monitor_list((ObjectMonitor **)&gOmInUseList, &freeHeadp, &freeTailp); |
51998
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1658 |
gOmInUseCount -= deflated_count; |
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1659 |
counters->nScavenged += deflated_count; |
27b48d82272c
8211384: Obsolete -XX:+/-MonitorInUseLists option
redestad
parents:
51860
diff
changeset
|
1660 |
counters->nInuse += gOmInUseCount; |
1 | 1661 |
} |
1662 |
||
1663 |
// Move the scavenged monitors back to the global free list. |
|
30244 | 1664 |
if (freeHeadp != NULL) { |
46702 | 1665 |
guarantee(freeTailp != NULL && counters->nScavenged > 0, "invariant"); |
30244 | 1666 |
assert(freeTailp->FreeNext == NULL, "invariant"); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1667 |
// constant-time list splice - prepend scavenged segment to gFreeList |
30244 | 1668 |
freeTailp->FreeNext = gFreeList; |
1669 |
gFreeList = freeHeadp; |
|
1 | 1670 |
} |
30244 | 1671 |
Thread::muxRelease(&gListLock); |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1672 |
timer.stop(); |
1 | 1673 |
|
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1674 |
LogStreamHandle(Debug, monitorinflation) lsh_debug; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1675 |
LogStreamHandle(Info, monitorinflation) lsh_info; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1676 |
LogStream * ls = NULL; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1677 |
if (log_is_enabled(Debug, monitorinflation)) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1678 |
ls = &lsh_debug; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1679 |
} else if (deflated_count != 0 && log_is_enabled(Info, monitorinflation)) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1680 |
ls = &lsh_info; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1681 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1682 |
if (ls != NULL) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1683 |
ls->print_cr("deflating global idle monitors, %3.7f secs, %d monitors", timer.seconds(), deflated_count); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1684 |
} |
46702 | 1685 |
} |
1686 |
||
1687 |
void ObjectSynchronizer::finish_deflate_idle_monitors(DeflateMonitorCounters* counters) { |
|
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1688 |
// Report the cumulative time for deflating each thread's idle |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1689 |
// monitors. Note: if the work is split among more than one |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1690 |
// worker thread, then the reported time will likely be more |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1691 |
// than a beginning to end measurement of the phase. |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1692 |
log_info(safepoint, cleanup)("deflating per-thread idle monitors, %3.7f secs, monitors=%d", counters->perThreadTimes, counters->perThreadScavenged); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1693 |
|
46702 | 1694 |
gMonitorFreeCount += counters->nScavenged; |
1695 |
||
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1696 |
if (log_is_enabled(Debug, monitorinflation)) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1697 |
// exit_globals()'s call to audit_and_print_stats() is done |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1698 |
// at the Info level. |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1699 |
ObjectSynchronizer::audit_and_print_stats(false /* on_exit */); |
54291
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1700 |
} else if (log_is_enabled(Info, monitorinflation)) { |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1701 |
Thread::muxAcquire(&gListLock, "finish_deflate_idle_monitors"); |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1702 |
log_info(monitorinflation)("gMonitorPopulation=%d, gOmInUseCount=%d, " |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1703 |
"gMonitorFreeCount=%d", gMonitorPopulation, |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1704 |
gOmInUseCount, gMonitorFreeCount); |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1705 |
Thread::muxRelease(&gListLock); |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1706 |
} |
46702 | 1707 |
|
1708 |
ForceMonitorScavenge = 0; // Reset |
|
1709 |
||
1710 |
OM_PERFDATA_OP(Deflations, inc(counters->nScavenged)); |
|
1711 |
OM_PERFDATA_OP(MonExtant, set_value(counters->nInCirculation)); |
|
1 | 1712 |
|
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
1713 |
GVars.stwRandom = os::random(); |
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
1714 |
GVars.stwCycle++; |
1 | 1715 |
} |
1716 |
||
46702 | 1717 |
void ObjectSynchronizer::deflate_thread_local_monitors(Thread* thread, DeflateMonitorCounters* counters) { |
1718 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
|
1719 |
||
1720 |
ObjectMonitor * freeHeadp = NULL; // Local SLL of scavenged monitors |
|
1721 |
ObjectMonitor * freeTailp = NULL; |
|
52703
e7fdc9d9c376
8202415: Incorrect time logged for monitor deflation
dcubed
parents:
52459
diff
changeset
|
1722 |
elapsedTimer timer; |
e7fdc9d9c376
8202415: Incorrect time logged for monitor deflation
dcubed
parents:
52459
diff
changeset
|
1723 |
|
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1724 |
if (log_is_enabled(Info, safepoint, cleanup) || |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1725 |
log_is_enabled(Info, monitorinflation)) { |
52703
e7fdc9d9c376
8202415: Incorrect time logged for monitor deflation
dcubed
parents:
52459
diff
changeset
|
1726 |
timer.start(); |
e7fdc9d9c376
8202415: Incorrect time logged for monitor deflation
dcubed
parents:
52459
diff
changeset
|
1727 |
} |
46702 | 1728 |
|
1729 |
int deflated_count = deflate_monitor_list(thread->omInUseList_addr(), &freeHeadp, &freeTailp); |
|
1730 |
||
53557
4cfe0e5a3b79
8217658: baseline_cleanups from Async Monitor Deflation project
dcubed
parents:
52703
diff
changeset
|
1731 |
Thread::muxAcquire(&gListLock, "deflate_thread_local_monitors"); |
46702 | 1732 |
|
1733 |
// Adjust counters |
|
1734 |
counters->nInCirculation += thread->omInUseCount; |
|
1735 |
thread->omInUseCount -= deflated_count; |
|
1736 |
counters->nScavenged += deflated_count; |
|
1737 |
counters->nInuse += thread->omInUseCount; |
|
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1738 |
counters->perThreadScavenged += deflated_count; |
46702 | 1739 |
|
1740 |
// Move the scavenged monitors back to the global free list. |
|
1741 |
if (freeHeadp != NULL) { |
|
1742 |
guarantee(freeTailp != NULL && deflated_count > 0, "invariant"); |
|
1743 |
assert(freeTailp->FreeNext == NULL, "invariant"); |
|
1744 |
||
1745 |
// constant-time list splice - prepend scavenged segment to gFreeList |
|
1746 |
freeTailp->FreeNext = gFreeList; |
|
1747 |
gFreeList = freeHeadp; |
|
1748 |
} |
|
54291
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1749 |
|
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1750 |
timer.stop(); |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1751 |
// Safepoint logging cares about cumulative perThreadTimes and |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1752 |
// we'll capture most of the cost, but not the muxRelease() which |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1753 |
// should be cheap. |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1754 |
counters->perThreadTimes += timer.seconds(); |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1755 |
|
46702 | 1756 |
Thread::muxRelease(&gListLock); |
54291
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1757 |
|
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1758 |
LogStreamHandle(Debug, monitorinflation) lsh_debug; |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1759 |
LogStreamHandle(Info, monitorinflation) lsh_info; |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1760 |
LogStream * ls = NULL; |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1761 |
if (log_is_enabled(Debug, monitorinflation)) { |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1762 |
ls = &lsh_debug; |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1763 |
} else if (deflated_count != 0 && log_is_enabled(Info, monitorinflation)) { |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1764 |
ls = &lsh_info; |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1765 |
} |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1766 |
if (ls != NULL) { |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1767 |
ls->print_cr("jt=" INTPTR_FORMAT ": deflating per-thread idle monitors, %3.7f secs, %d monitors", p2i(thread), timer.seconds(), deflated_count); |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1768 |
} |
46702 | 1769 |
} |
1770 |
||
6975 | 1771 |
// Monitor cleanup on JavaThread::exit |
1 | 1772 |
|
6975 | 1773 |
// Iterate through monitor cache and attempt to release thread's monitors |
1774 |
// Gives up on a particular monitor if an exception occurs, but continues |
|
1775 |
// the overall iteration, swallowing the exception. |
|
1776 |
class ReleaseJavaMonitorsClosure: public MonitorClosure { |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1777 |
private: |
6975 | 1778 |
TRAPS; |
1 | 1779 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1780 |
public: |
6975 | 1781 |
ReleaseJavaMonitorsClosure(Thread* thread) : THREAD(thread) {} |
1782 |
void do_monitor(ObjectMonitor* mid) { |
|
1783 |
if (mid->owner() == THREAD) { |
|
1784 |
(void)mid->complete_exit(CHECK); |
|
1 | 1785 |
} |
1786 |
} |
|
6975 | 1787 |
}; |
1 | 1788 |
|
6975 | 1789 |
// Release all inflated monitors owned by THREAD. Lightweight monitors are |
1790 |
// ignored. This is meant to be called during JNI thread detach which assumes |
|
1791 |
// all remaining monitors are heavyweight. All exceptions are swallowed. |
|
1792 |
// Scanning the extant monitor list can be time consuming. |
|
1793 |
// A simple optimization is to add a per-thread flag that indicates a thread |
|
1794 |
// called jni_monitorenter() during its lifetime. |
|
1 | 1795 |
// |
6975 | 1796 |
// Instead of No_Savepoint_Verifier it might be cheaper to |
1797 |
// use an idiom of the form: |
|
1798 |
// auto int tmp = SafepointSynchronize::_safepoint_counter ; |
|
1799 |
// <code that must not run at safepoint> |
|
1800 |
// guarantee (((tmp ^ _safepoint_counter) | (tmp & 1)) == 0) ; |
|
1801 |
// Since the tests are extremely cheap we could leave them enabled |
|
1802 |
// for normal product builds. |
|
1 | 1803 |
|
6975 | 1804 |
void ObjectSynchronizer::release_monitors_owned_by_thread(TRAPS) { |
1805 |
assert(THREAD == JavaThread::current(), "must be current Java thread"); |
|
35492
c8c0273e6b91
8146690: Make all classes in GC follow the naming convention.
david
parents:
35171
diff
changeset
|
1806 |
NoSafepointVerifier nsv; |
6975 | 1807 |
ReleaseJavaMonitorsClosure rjmc(THREAD); |
30244 | 1808 |
Thread::muxAcquire(&gListLock, "release_monitors_owned_by_thread"); |
6975 | 1809 |
ObjectSynchronizer::monitors_iterate(&rjmc); |
30244 | 1810 |
Thread::muxRelease(&gListLock); |
6975 | 1811 |
THREAD->clear_pending_exception(); |
1 | 1812 |
} |
1813 |
||
35934
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1814 |
const char* ObjectSynchronizer::inflate_cause_name(const InflateCause cause) { |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1815 |
switch (cause) { |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1816 |
case inflate_cause_vm_internal: return "VM Internal"; |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1817 |
case inflate_cause_monitor_enter: return "Monitor Enter"; |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1818 |
case inflate_cause_wait: return "Monitor Wait"; |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1819 |
case inflate_cause_notify: return "Monitor Notify"; |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1820 |
case inflate_cause_hash_code: return "Monitor Hash Code"; |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1821 |
case inflate_cause_jni_enter: return "JNI Monitor Enter"; |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1822 |
case inflate_cause_jni_exit: return "JNI Monitor Exit"; |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1823 |
default: |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1824 |
ShouldNotReachHere(); |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1825 |
} |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1826 |
return "Unknown"; |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1827 |
} |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1828 |
|
1 | 1829 |
//------------------------------------------------------------------------------ |
25633
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
1830 |
// Debugging code |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
1831 |
|
51258 | 1832 |
u_char* ObjectSynchronizer::get_gvars_addr() { |
1833 |
return (u_char*)&GVars; |
|
1834 |
} |
|
25633
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
1835 |
|
51258 | 1836 |
u_char* ObjectSynchronizer::get_gvars_hcSequence_addr() { |
1837 |
return (u_char*)&GVars.hcSequence; |
|
1838 |
} |
|
25633
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
1839 |
|
51258 | 1840 |
size_t ObjectSynchronizer::get_gvars_size() { |
1841 |
return sizeof(SharedGlobals); |
|
1842 |
} |
|
25633
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
1843 |
|
51258 | 1844 |
u_char* ObjectSynchronizer::get_gvars_stwRandom_addr() { |
1845 |
return (u_char*)&GVars.stwRandom; |
|
25633
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
1846 |
} |
1 | 1847 |
|
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1848 |
void ObjectSynchronizer::audit_and_print_stats(bool on_exit) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1849 |
assert(on_exit || SafepointSynchronize::is_at_safepoint(), "invariant"); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1850 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1851 |
LogStreamHandle(Debug, monitorinflation) lsh_debug; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1852 |
LogStreamHandle(Info, monitorinflation) lsh_info; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1853 |
LogStreamHandle(Trace, monitorinflation) lsh_trace; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1854 |
LogStream * ls = NULL; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1855 |
if (log_is_enabled(Trace, monitorinflation)) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1856 |
ls = &lsh_trace; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1857 |
} else if (log_is_enabled(Debug, monitorinflation)) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1858 |
ls = &lsh_debug; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1859 |
} else if (log_is_enabled(Info, monitorinflation)) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1860 |
ls = &lsh_info; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1861 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1862 |
assert(ls != NULL, "sanity check"); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1863 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1864 |
if (!on_exit) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1865 |
// Not at VM exit so grab the global list lock. |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1866 |
Thread::muxAcquire(&gListLock, "audit_and_print_stats"); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1867 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1868 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1869 |
// Log counts for the global and per-thread monitor lists: |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1870 |
int chkMonitorPopulation = log_monitor_list_counts(ls); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1871 |
int error_cnt = 0; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1872 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1873 |
ls->print_cr("Checking global lists:"); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1874 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1875 |
// Check gMonitorPopulation: |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1876 |
if (gMonitorPopulation == chkMonitorPopulation) { |
54291
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1877 |
ls->print_cr("gMonitorPopulation=%d equals chkMonitorPopulation=%d", |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1878 |
gMonitorPopulation, chkMonitorPopulation); |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1879 |
} else { |
54291
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1880 |
ls->print_cr("ERROR: gMonitorPopulation=%d is not equal to " |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1881 |
"chkMonitorPopulation=%d", gMonitorPopulation, |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1882 |
chkMonitorPopulation); |
e6c86f6012bf
8221350: more monitor logging updates from Async Monitor Deflation project
dcubed
parents:
53588
diff
changeset
|
1883 |
error_cnt++; |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1884 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1885 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1886 |
// Check gOmInUseList and gOmInUseCount: |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1887 |
chk_global_in_use_list_and_count(ls, &error_cnt); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1888 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1889 |
// Check gFreeList and gMonitorFreeCount: |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1890 |
chk_global_free_list_and_count(ls, &error_cnt); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1891 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1892 |
if (!on_exit) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1893 |
Thread::muxRelease(&gListLock); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1894 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1895 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1896 |
ls->print_cr("Checking per-thread lists:"); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1897 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1898 |
for (JavaThreadIteratorWithHandle jtiwh; JavaThread *jt = jtiwh.next(); ) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1899 |
// Check omInUseList and omInUseCount: |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1900 |
chk_per_thread_in_use_list_and_count(jt, ls, &error_cnt); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1901 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1902 |
// Check omFreeList and omFreeCount: |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1903 |
chk_per_thread_free_list_and_count(jt, ls, &error_cnt); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1904 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1905 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1906 |
if (error_cnt == 0) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1907 |
ls->print_cr("No errors found in monitor list checks."); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1908 |
} else { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1909 |
log_error(monitorinflation)("found monitor list errors: error_cnt=%d", error_cnt); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1910 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1911 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1912 |
if ((on_exit && log_is_enabled(Info, monitorinflation)) || |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1913 |
(!on_exit && log_is_enabled(Trace, monitorinflation))) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1914 |
// When exiting this log output is at the Info level. When called |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1915 |
// at a safepoint, this log output is at the Trace level since |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1916 |
// there can be a lot of it. |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1917 |
log_in_use_monitor_details(ls, on_exit); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1918 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1919 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1920 |
ls->flush(); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1921 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1922 |
guarantee(error_cnt == 0, "ERROR: found monitor list errors: error_cnt=%d", error_cnt); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1923 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1924 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1925 |
// Check a free monitor entry; log any errors. |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1926 |
void ObjectSynchronizer::chk_free_entry(JavaThread * jt, ObjectMonitor * n, |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1927 |
outputStream * out, int *error_cnt_p) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1928 |
if (n->is_busy()) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1929 |
if (jt != NULL) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1930 |
out->print_cr("ERROR: jt=" INTPTR_FORMAT ", monitor=" INTPTR_FORMAT |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1931 |
": free per-thread monitor must not be busy.", p2i(jt), |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1932 |
p2i(n)); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1933 |
} else { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1934 |
out->print_cr("ERROR: monitor=" INTPTR_FORMAT ": free global monitor " |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1935 |
"must not be busy.", p2i(n)); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1936 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1937 |
*error_cnt_p = *error_cnt_p + 1; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1938 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1939 |
if (n->header() != NULL) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1940 |
if (jt != NULL) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1941 |
out->print_cr("ERROR: jt=" INTPTR_FORMAT ", monitor=" INTPTR_FORMAT |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1942 |
": free per-thread monitor must have NULL _header " |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1943 |
"field: _header=" INTPTR_FORMAT, p2i(jt), p2i(n), |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1944 |
p2i(n->header())); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1945 |
} else { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1946 |
out->print_cr("ERROR: monitor=" INTPTR_FORMAT ": free global monitor " |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1947 |
"must have NULL _header field: _header=" INTPTR_FORMAT, |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1948 |
p2i(n), p2i(n->header())); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1949 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1950 |
*error_cnt_p = *error_cnt_p + 1; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1951 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1952 |
if (n->object() != NULL) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1953 |
if (jt != NULL) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1954 |
out->print_cr("ERROR: jt=" INTPTR_FORMAT ", monitor=" INTPTR_FORMAT |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1955 |
": free per-thread monitor must have NULL _object " |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1956 |
"field: _object=" INTPTR_FORMAT, p2i(jt), p2i(n), |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1957 |
p2i(n->object())); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1958 |
} else { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1959 |
out->print_cr("ERROR: monitor=" INTPTR_FORMAT ": free global monitor " |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1960 |
"must have NULL _object field: _object=" INTPTR_FORMAT, |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1961 |
p2i(n), p2i(n->object())); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1962 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1963 |
*error_cnt_p = *error_cnt_p + 1; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1964 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1965 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1966 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1967 |
// Check the global free list and count; log the results of the checks. |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1968 |
void ObjectSynchronizer::chk_global_free_list_and_count(outputStream * out, |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1969 |
int *error_cnt_p) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1970 |
int chkMonitorFreeCount = 0; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1971 |
for (ObjectMonitor * n = gFreeList; n != NULL; n = n->FreeNext) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1972 |
chk_free_entry(NULL /* jt */, n, out, error_cnt_p); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1973 |
chkMonitorFreeCount++; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1974 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1975 |
if (gMonitorFreeCount == chkMonitorFreeCount) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1976 |
out->print_cr("gMonitorFreeCount=%d equals chkMonitorFreeCount=%d", |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1977 |
gMonitorFreeCount, chkMonitorFreeCount); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1978 |
} else { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1979 |
out->print_cr("ERROR: gMonitorFreeCount=%d is not equal to " |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1980 |
"chkMonitorFreeCount=%d", gMonitorFreeCount, |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1981 |
chkMonitorFreeCount); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1982 |
*error_cnt_p = *error_cnt_p + 1; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1983 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1984 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1985 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1986 |
// Check the global in-use list and count; log the results of the checks. |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1987 |
void ObjectSynchronizer::chk_global_in_use_list_and_count(outputStream * out, |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1988 |
int *error_cnt_p) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1989 |
int chkOmInUseCount = 0; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1990 |
for (ObjectMonitor * n = gOmInUseList; n != NULL; n = n->FreeNext) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1991 |
chk_in_use_entry(NULL /* jt */, n, out, error_cnt_p); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1992 |
chkOmInUseCount++; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1993 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1994 |
if (gOmInUseCount == chkOmInUseCount) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1995 |
out->print_cr("gOmInUseCount=%d equals chkOmInUseCount=%d", gOmInUseCount, |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1996 |
chkOmInUseCount); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1997 |
} else { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1998 |
out->print_cr("ERROR: gOmInUseCount=%d is not equal to chkOmInUseCount=%d", |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
1999 |
gOmInUseCount, chkOmInUseCount); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2000 |
*error_cnt_p = *error_cnt_p + 1; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2001 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2002 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2003 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2004 |
// Check an in-use monitor entry; log any errors. |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2005 |
void ObjectSynchronizer::chk_in_use_entry(JavaThread * jt, ObjectMonitor * n, |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2006 |
outputStream * out, int *error_cnt_p) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2007 |
if (n->header() == NULL) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2008 |
if (jt != NULL) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2009 |
out->print_cr("ERROR: jt=" INTPTR_FORMAT ", monitor=" INTPTR_FORMAT |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2010 |
": in-use per-thread monitor must have non-NULL _header " |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2011 |
"field.", p2i(jt), p2i(n)); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2012 |
} else { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2013 |
out->print_cr("ERROR: monitor=" INTPTR_FORMAT ": in-use global monitor " |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2014 |
"must have non-NULL _header field.", p2i(n)); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2015 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2016 |
*error_cnt_p = *error_cnt_p + 1; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2017 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2018 |
if (n->object() == NULL) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2019 |
if (jt != NULL) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2020 |
out->print_cr("ERROR: jt=" INTPTR_FORMAT ", monitor=" INTPTR_FORMAT |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2021 |
": in-use per-thread monitor must have non-NULL _object " |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2022 |
"field.", p2i(jt), p2i(n)); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2023 |
} else { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2024 |
out->print_cr("ERROR: monitor=" INTPTR_FORMAT ": in-use global monitor " |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2025 |
"must have non-NULL _object field.", p2i(n)); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2026 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2027 |
*error_cnt_p = *error_cnt_p + 1; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2028 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2029 |
const oop obj = (oop)n->object(); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2030 |
const markOop mark = obj->mark(); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2031 |
if (!mark->has_monitor()) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2032 |
if (jt != NULL) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2033 |
out->print_cr("ERROR: jt=" INTPTR_FORMAT ", monitor=" INTPTR_FORMAT |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2034 |
": in-use per-thread monitor's object does not think " |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2035 |
"it has a monitor: obj=" INTPTR_FORMAT ", mark=" |
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
2036 |
INTPTR_FORMAT, p2i(jt), p2i(n), p2i(obj), p2i(mark)); |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2037 |
} else { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2038 |
out->print_cr("ERROR: monitor=" INTPTR_FORMAT ": in-use global " |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2039 |
"monitor's object does not think it has a monitor: obj=" |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2040 |
INTPTR_FORMAT ", mark=" INTPTR_FORMAT, p2i(n), |
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
2041 |
p2i(obj), p2i(mark)); |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2042 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2043 |
*error_cnt_p = *error_cnt_p + 1; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2044 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2045 |
ObjectMonitor * const obj_mon = mark->monitor(); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2046 |
if (n != obj_mon) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2047 |
if (jt != NULL) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2048 |
out->print_cr("ERROR: jt=" INTPTR_FORMAT ", monitor=" INTPTR_FORMAT |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2049 |
": in-use per-thread monitor's object does not refer " |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2050 |
"to the same monitor: obj=" INTPTR_FORMAT ", mark=" |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2051 |
INTPTR_FORMAT ", obj_mon=" INTPTR_FORMAT, p2i(jt), |
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
2052 |
p2i(n), p2i(obj), p2i(mark), p2i(obj_mon)); |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2053 |
} else { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2054 |
out->print_cr("ERROR: monitor=" INTPTR_FORMAT ": in-use global " |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2055 |
"monitor's object does not refer to the same monitor: obj=" |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2056 |
INTPTR_FORMAT ", mark=" INTPTR_FORMAT ", obj_mon=" |
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
2057 |
INTPTR_FORMAT, p2i(n), p2i(obj), p2i(mark), p2i(obj_mon)); |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2058 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2059 |
*error_cnt_p = *error_cnt_p + 1; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2060 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2061 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2062 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2063 |
// Check the thread's free list and count; log the results of the checks. |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2064 |
void ObjectSynchronizer::chk_per_thread_free_list_and_count(JavaThread *jt, |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2065 |
outputStream * out, |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2066 |
int *error_cnt_p) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2067 |
int chkOmFreeCount = 0; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2068 |
for (ObjectMonitor * n = jt->omFreeList; n != NULL; n = n->FreeNext) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2069 |
chk_free_entry(jt, n, out, error_cnt_p); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2070 |
chkOmFreeCount++; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2071 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2072 |
if (jt->omFreeCount == chkOmFreeCount) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2073 |
out->print_cr("jt=" INTPTR_FORMAT ": omFreeCount=%d equals " |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2074 |
"chkOmFreeCount=%d", p2i(jt), jt->omFreeCount, chkOmFreeCount); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2075 |
} else { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2076 |
out->print_cr("ERROR: jt=" INTPTR_FORMAT ": omFreeCount=%d is not " |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2077 |
"equal to chkOmFreeCount=%d", p2i(jt), jt->omFreeCount, |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2078 |
chkOmFreeCount); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2079 |
*error_cnt_p = *error_cnt_p + 1; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2080 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2081 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2082 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2083 |
// Check the thread's in-use list and count; log the results of the checks. |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2084 |
void ObjectSynchronizer::chk_per_thread_in_use_list_and_count(JavaThread *jt, |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2085 |
outputStream * out, |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2086 |
int *error_cnt_p) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2087 |
int chkOmInUseCount = 0; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2088 |
for (ObjectMonitor * n = jt->omInUseList; n != NULL; n = n->FreeNext) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2089 |
chk_in_use_entry(jt, n, out, error_cnt_p); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2090 |
chkOmInUseCount++; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2091 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2092 |
if (jt->omInUseCount == chkOmInUseCount) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2093 |
out->print_cr("jt=" INTPTR_FORMAT ": omInUseCount=%d equals " |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2094 |
"chkOmInUseCount=%d", p2i(jt), jt->omInUseCount, |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2095 |
chkOmInUseCount); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2096 |
} else { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2097 |
out->print_cr("ERROR: jt=" INTPTR_FORMAT ": omInUseCount=%d is not " |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2098 |
"equal to chkOmInUseCount=%d", p2i(jt), jt->omInUseCount, |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2099 |
chkOmInUseCount); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2100 |
*error_cnt_p = *error_cnt_p + 1; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2101 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2102 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2103 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2104 |
// Log details about ObjectMonitors on the in-use lists. The 'BHL' |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2105 |
// flags indicate why the entry is in-use, 'object' and 'object type' |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2106 |
// indicate the associated object and its type. |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2107 |
void ObjectSynchronizer::log_in_use_monitor_details(outputStream * out, |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2108 |
bool on_exit) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2109 |
if (!on_exit) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2110 |
// Not at VM exit so grab the global list lock. |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2111 |
Thread::muxAcquire(&gListLock, "log_in_use_monitor_details"); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2112 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2113 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2114 |
if (gOmInUseCount > 0) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2115 |
out->print_cr("In-use global monitor info:"); |
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
2116 |
out->print_cr("(B -> is_busy, H -> has hash code, L -> lock status)"); |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2117 |
out->print_cr("%18s %s %18s %18s", |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2118 |
"monitor", "BHL", "object", "object type"); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2119 |
out->print_cr("================== === ================== =================="); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2120 |
for (ObjectMonitor * n = gOmInUseList; n != NULL; n = n->FreeNext) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2121 |
const oop obj = (oop) n->object(); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2122 |
const markOop mark = n->header(); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2123 |
ResourceMark rm; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2124 |
out->print_cr(INTPTR_FORMAT " %d%d%d " INTPTR_FORMAT " %s", p2i(n), |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2125 |
n->is_busy() != 0, mark->hash() != 0, n->owner() != NULL, |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2126 |
p2i(obj), obj->klass()->external_name()); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2127 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2128 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2129 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2130 |
if (!on_exit) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2131 |
Thread::muxRelease(&gListLock); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2132 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2133 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2134 |
out->print_cr("In-use per-thread monitor info:"); |
54609
04857e2cd509
8222295: more baseline cleanups from Async Monitor Deflation project
dcubed
parents:
54291
diff
changeset
|
2135 |
out->print_cr("(B -> is_busy, H -> has hash code, L -> lock status)"); |
53588
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2136 |
out->print_cr("%18s %18s %s %18s %18s", |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2137 |
"jt", "monitor", "BHL", "object", "object type"); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2138 |
out->print_cr("================== ================== === ================== =================="); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2139 |
for (JavaThreadIteratorWithHandle jtiwh; JavaThread *jt = jtiwh.next(); ) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2140 |
for (ObjectMonitor * n = jt->omInUseList; n != NULL; n = n->FreeNext) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2141 |
const oop obj = (oop) n->object(); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2142 |
const markOop mark = n->header(); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2143 |
ResourceMark rm; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2144 |
out->print_cr(INTPTR_FORMAT " " INTPTR_FORMAT " %d%d%d " INTPTR_FORMAT |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2145 |
" %s", p2i(jt), p2i(n), n->is_busy() != 0, |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2146 |
mark->hash() != 0, n->owner() != NULL, p2i(obj), |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2147 |
obj->klass()->external_name()); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2148 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2149 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2150 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2151 |
out->flush(); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2152 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2153 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2154 |
// Log counts for the global and per-thread monitor lists and return |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2155 |
// the population count. |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2156 |
int ObjectSynchronizer::log_monitor_list_counts(outputStream * out) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2157 |
int popCount = 0; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2158 |
out->print_cr("%18s %10s %10s %10s", |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2159 |
"Global Lists:", "InUse", "Free", "Total"); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2160 |
out->print_cr("================== ========== ========== =========="); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2161 |
out->print_cr("%18s %10d %10d %10d", "", |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2162 |
gOmInUseCount, gMonitorFreeCount, gMonitorPopulation); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2163 |
popCount += gOmInUseCount + gMonitorFreeCount; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2164 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2165 |
out->print_cr("%18s %10s %10s %10s", |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2166 |
"Per-Thread Lists:", "InUse", "Free", "Provision"); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2167 |
out->print_cr("================== ========== ========== =========="); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2168 |
|
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2169 |
for (JavaThreadIteratorWithHandle jtiwh; JavaThread *jt = jtiwh.next(); ) { |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2170 |
out->print_cr(INTPTR_FORMAT " %10d %10d %10d", p2i(jt), |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2171 |
jt->omInUseCount, jt->omFreeCount, jt->omFreeProvision); |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2172 |
popCount += jt->omInUseCount + jt->omFreeCount; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2173 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2174 |
return popCount; |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2175 |
} |
a5f46c4690f8
8217659: monitor_logging updates from Async Monitor Deflation project
dcubed
parents:
53557
diff
changeset
|
2176 |
|
1 | 2177 |
#ifndef PRODUCT |
2178 |
||
2179 |
// Check if monitor belongs to the monitor cache |
|
2180 |
// The list is grow-only so it's *relatively* safe to traverse |
|
2181 |
// the list of extant blocks without taking a lock. |
|
2182 |
||
2183 |
int ObjectSynchronizer::verify_objmon_isinpool(ObjectMonitor *monitor) { |
|
47634
6a0c42c40cd1
8188220: Remove Atomic::*_ptr() uses and overloads from hotspot
coleenp
parents:
47216
diff
changeset
|
2184 |
PaddedEnd<ObjectMonitor> * block = OrderAccess::load_acquire(&gBlockList); |
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
2185 |
while (block != NULL) { |
1 | 2186 |
assert(block->object() == CHAINMARKER, "must be a block header"); |
47634
6a0c42c40cd1
8188220: Remove Atomic::*_ptr() uses and overloads from hotspot
coleenp
parents:
47216
diff
changeset
|
2187 |
if (monitor > &block[0] && monitor < &block[_BLOCKSIZE]) { |
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
2188 |
address mon = (address)monitor; |
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
2189 |
address blk = (address)block; |
1 | 2190 |
size_t diff = mon - blk; |
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
2191 |
assert((diff % sizeof(PaddedEnd<ObjectMonitor>)) == 0, "must be aligned"); |
1 | 2192 |
return 1; |
2193 |
} |
|
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
2194 |
block = (PaddedEnd<ObjectMonitor> *)block->FreeNext; |
1 | 2195 |
} |
2196 |
return 0; |
|
2197 |
} |
|
2198 |
||
2199 |
#endif |