author | ysr |
Mon, 02 Mar 2009 16:37:04 -0800 | |
changeset 2141 | e9a644aaff87 |
parent 1388 | 3677f5f3d66b |
child 5348 | 5141d36180d5 |
permissions | -rw-r--r-- |
1 | 1 |
/* |
670 | 2 |
* Copyright 2005-2008 Sun Microsystems, Inc. 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 |
* |
|
19 |
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
|
20 |
* CA 95054 USA or visit www.sun.com if you need additional information or |
|
21 |
* have any questions. |
|
22 |
* |
|
23 |
*/ |
|
24 |
# include "incls/_precompiled.incl" |
|
25 |
# include "incls/_vmGCOperations.cpp.incl" |
|
26 |
||
27 |
HS_DTRACE_PROBE_DECL1(hotspot, gc__begin, bool); |
|
28 |
HS_DTRACE_PROBE_DECL(hotspot, gc__end); |
|
29 |
||
30 |
// The same dtrace probe can't be inserted in two different files, so we |
|
31 |
// have to call it here, so it's only in one file. Can't create new probes |
|
32 |
// for the other file anymore. The dtrace probes have to remain stable. |
|
33 |
void VM_GC_Operation::notify_gc_begin(bool full) { |
|
34 |
HS_DTRACE_PROBE1(hotspot, gc__begin, full); |
|
35 |
} |
|
36 |
||
37 |
void VM_GC_Operation::notify_gc_end() { |
|
38 |
HS_DTRACE_PROBE(hotspot, gc__end); |
|
39 |
} |
|
40 |
||
41 |
void VM_GC_Operation::acquire_pending_list_lock() { |
|
42 |
// we may enter this with pending exception set |
|
43 |
instanceRefKlass::acquire_pending_list_lock(&_pending_list_basic_lock); |
|
44 |
} |
|
45 |
||
46 |
||
47 |
void VM_GC_Operation::release_and_notify_pending_list_lock() { |
|
48 |
||
49 |
instanceRefKlass::release_and_notify_pending_list_lock(&_pending_list_basic_lock); |
|
50 |
} |
|
51 |
||
52 |
// Allocations may fail in several threads at about the same time, |
|
53 |
// resulting in multiple gc requests. We only want to do one of them. |
|
54 |
// In case a GC locker is active and the need for a GC is already signalled, |
|
55 |
// we want to skip this GC attempt altogether, without doing a futile |
|
56 |
// safepoint operation. |
|
57 |
bool VM_GC_Operation::skip_operation() const { |
|
58 |
bool skip = (_gc_count_before != Universe::heap()->total_collections()); |
|
59 |
if (_full && skip) { |
|
60 |
skip = (_full_gc_count_before != Universe::heap()->total_full_collections()); |
|
61 |
} |
|
62 |
if (!skip && GC_locker::is_active_and_needs_gc()) { |
|
63 |
skip = Universe::heap()->is_maximal_no_gc(); |
|
64 |
assert(!(skip && (_gc_cause == GCCause::_gc_locker)), |
|
65 |
"GC_locker cannot be active when initiating GC"); |
|
66 |
} |
|
67 |
return skip; |
|
68 |
} |
|
69 |
||
70 |
bool VM_GC_Operation::doit_prologue() { |
|
71 |
assert(Thread::current()->is_Java_thread(), "just checking"); |
|
72 |
||
73 |
acquire_pending_list_lock(); |
|
74 |
// If the GC count has changed someone beat us to the collection |
|
75 |
// Get the Heap_lock after the pending_list_lock. |
|
76 |
Heap_lock->lock(); |
|
1374
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
386
diff
changeset
|
77 |
|
1 | 78 |
// Check invocations |
79 |
if (skip_operation()) { |
|
80 |
// skip collection |
|
81 |
Heap_lock->unlock(); |
|
82 |
release_and_notify_pending_list_lock(); |
|
83 |
_prologue_succeeded = false; |
|
84 |
} else { |
|
85 |
_prologue_succeeded = true; |
|
1374
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
386
diff
changeset
|
86 |
SharedHeap* sh = SharedHeap::heap(); |
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
386
diff
changeset
|
87 |
if (sh != NULL) sh->_thread_holds_heap_lock_for_gc = true; |
1 | 88 |
} |
89 |
return _prologue_succeeded; |
|
90 |
} |
|
91 |
||
92 |
||
93 |
void VM_GC_Operation::doit_epilogue() { |
|
94 |
assert(Thread::current()->is_Java_thread(), "just checking"); |
|
95 |
// Release the Heap_lock first. |
|
1374
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
386
diff
changeset
|
96 |
SharedHeap* sh = SharedHeap::heap(); |
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
386
diff
changeset
|
97 |
if (sh != NULL) sh->_thread_holds_heap_lock_for_gc = false; |
1 | 98 |
Heap_lock->unlock(); |
99 |
release_and_notify_pending_list_lock(); |
|
100 |
} |
|
101 |
||
102 |
bool VM_GC_HeapInspection::doit_prologue() { |
|
103 |
if (Universe::heap()->supports_heap_inspection()) { |
|
104 |
return VM_GC_Operation::doit_prologue(); |
|
105 |
} else { |
|
106 |
return false; |
|
107 |
} |
|
108 |
} |
|
109 |
||
110 |
bool VM_GC_HeapInspection::skip_operation() const { |
|
111 |
assert(Universe::heap()->supports_heap_inspection(), "huh?"); |
|
112 |
return false; |
|
113 |
} |
|
114 |
||
115 |
void VM_GC_HeapInspection::doit() { |
|
116 |
HandleMark hm; |
|
117 |
CollectedHeap* ch = Universe::heap(); |
|
118 |
if (_full_gc) { |
|
119 |
ch->collect_as_vm_thread(GCCause::_heap_inspection); |
|
120 |
} else { |
|
121 |
// make the heap parsable (no need to retire TLABs) |
|
122 |
ch->ensure_parsability(false); |
|
123 |
} |
|
2141
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
1388
diff
changeset
|
124 |
HeapInspection::heap_inspection(_out, _need_prologue /* need_prologue */); |
1 | 125 |
} |
126 |
||
127 |
||
128 |
void VM_GenCollectForAllocation::doit() { |
|
129 |
JvmtiGCForAllocationMarker jgcm; |
|
130 |
notify_gc_begin(false); |
|
131 |
||
132 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
|
133 |
GCCauseSetter gccs(gch, _gc_cause); |
|
134 |
_res = gch->satisfy_failed_allocation(_size, _tlab); |
|
135 |
assert(gch->is_in_reserved_or_null(_res), "result not in heap"); |
|
136 |
||
137 |
if (_res == NULL && GC_locker::is_active_and_needs_gc()) { |
|
138 |
set_gc_locked(); |
|
139 |
} |
|
140 |
notify_gc_end(); |
|
141 |
} |
|
142 |
||
143 |
void VM_GenCollectFull::doit() { |
|
144 |
JvmtiGCFullMarker jgcm; |
|
145 |
notify_gc_begin(true); |
|
146 |
||
147 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
|
148 |
GCCauseSetter gccs(gch, _gc_cause); |
|
149 |
gch->do_full_collection(gch->must_clear_all_soft_refs(), _max_level); |
|
150 |
notify_gc_end(); |
|
151 |
} |
|
386
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
1
diff
changeset
|
152 |
|
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
1
diff
changeset
|
153 |
void VM_GenCollectForPermanentAllocation::doit() { |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
1
diff
changeset
|
154 |
JvmtiGCForAllocationMarker jgcm; |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
1
diff
changeset
|
155 |
notify_gc_begin(true); |
1374
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
386
diff
changeset
|
156 |
SharedHeap* heap = (SharedHeap*)Universe::heap(); |
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
386
diff
changeset
|
157 |
GCCauseSetter gccs(heap, _gc_cause); |
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
386
diff
changeset
|
158 |
switch (heap->kind()) { |
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
386
diff
changeset
|
159 |
case (CollectedHeap::GenCollectedHeap): { |
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
386
diff
changeset
|
160 |
GenCollectedHeap* gch = (GenCollectedHeap*)heap; |
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
386
diff
changeset
|
161 |
gch->do_full_collection(gch->must_clear_all_soft_refs(), |
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
386
diff
changeset
|
162 |
gch->n_gens() - 1); |
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
386
diff
changeset
|
163 |
break; |
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
386
diff
changeset
|
164 |
} |
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
386
diff
changeset
|
165 |
#ifndef SERIALGC |
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
386
diff
changeset
|
166 |
case (CollectedHeap::G1CollectedHeap): { |
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
386
diff
changeset
|
167 |
G1CollectedHeap* g1h = (G1CollectedHeap*)heap; |
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
386
diff
changeset
|
168 |
g1h->do_full_collection(_gc_cause == GCCause::_last_ditch_collection); |
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
386
diff
changeset
|
169 |
break; |
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
386
diff
changeset
|
170 |
} |
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
386
diff
changeset
|
171 |
#endif // SERIALGC |
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
386
diff
changeset
|
172 |
default: |
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
386
diff
changeset
|
173 |
ShouldNotReachHere(); |
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
386
diff
changeset
|
174 |
} |
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
386
diff
changeset
|
175 |
_res = heap->perm_gen()->allocate(_size, false); |
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
386
diff
changeset
|
176 |
assert(heap->is_in_reserved_or_null(_res), "result not in heap"); |
386
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
1
diff
changeset
|
177 |
if (_res == NULL && GC_locker::is_active_and_needs_gc()) { |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
1
diff
changeset
|
178 |
set_gc_locked(); |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
1
diff
changeset
|
179 |
} |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
1
diff
changeset
|
180 |
notify_gc_end(); |
7f121b1192f2
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
1
diff
changeset
|
181 |
} |