author | coleenp |
Sat, 27 May 2017 09:21:01 -0400 | |
changeset 46505 | fd4bc78630b1 |
parent 41683 | cd5d2527e163 |
child 46795 | 623a5e42deb6 |
permissions | -rw-r--r-- |
1 | 1 |
/* |
46505
fd4bc78630b1
8174749: Use hash table/oops for MemberName table
coleenp
parents:
41683
diff
changeset
|
2 |
* Copyright (c) 2001, 2017, 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:
5343
diff
changeset
|
19 |
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
f4b087cbb361
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
5343
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:
5343
diff
changeset
|
21 |
* questions. |
1 | 22 |
* |
23 |
*/ |
|
24 |
||
7397 | 25 |
#include "precompiled.hpp" |
26 |
#include "classfile/javaClasses.hpp" |
|
24426
0a69c8cdfca9
8038654: Separate SymbolTable and StringTable code
gziemski
parents:
22883
diff
changeset
|
27 |
#include "classfile/stringTable.hpp" |
34666 | 28 |
#include "classfile/symbolTable.hpp" |
7397 | 29 |
#include "classfile/systemDictionary.hpp" |
30 |
#include "classfile/vmSymbols.hpp" |
|
31 |
#include "code/codeCache.hpp" |
|
32 |
#include "code/icBuffer.hpp" |
|
30764 | 33 |
#include "gc/serial/genMarkSweep.hpp" |
34 |
#include "gc/shared/collectedHeap.inline.hpp" |
|
35 |
#include "gc/shared/gcHeapSummary.hpp" |
|
36 |
#include "gc/shared/gcTimer.hpp" |
|
37 |
#include "gc/shared/gcTrace.hpp" |
|
35061 | 38 |
#include "gc/shared/gcTraceTime.inline.hpp" |
30764 | 39 |
#include "gc/shared/genCollectedHeap.hpp" |
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31354
diff
changeset
|
40 |
#include "gc/shared/generation.hpp" |
30764 | 41 |
#include "gc/shared/genOopClosures.inline.hpp" |
42 |
#include "gc/shared/modRefBarrierSet.hpp" |
|
43 |
#include "gc/shared/referencePolicy.hpp" |
|
44 |
#include "gc/shared/space.hpp" |
|
30868
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
45 |
#include "gc/shared/strongRootsScope.hpp" |
7397 | 46 |
#include "oops/instanceRefKlass.hpp" |
47 |
#include "oops/oop.inline.hpp" |
|
48 |
#include "prims/jvmtiExport.hpp" |
|
49 |
#include "runtime/fprofiler.hpp" |
|
50 |
#include "runtime/handles.inline.hpp" |
|
51 |
#include "runtime/synchronizer.hpp" |
|
14583
d70ee55535f4
8003935: Simplify the needed includes for using Thread::current()
stefank
parents:
13878
diff
changeset
|
52 |
#include "runtime/thread.inline.hpp" |
7397 | 53 |
#include "runtime/vmThread.hpp" |
54 |
#include "utilities/copy.hpp" |
|
55 |
#include "utilities/events.hpp" |
|
29702
9ed339a5e096
8075809: Add missing includes of stack.inline.hpp
stefank
parents:
29693
diff
changeset
|
56 |
#include "utilities/stack.inline.hpp" |
1 | 57 |
|
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31354
diff
changeset
|
58 |
void GenMarkSweep::invoke_at_safepoint(ReferenceProcessor* rp, bool clear_all_softrefs) { |
1 | 59 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); |
60 |
||
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
5076
diff
changeset
|
61 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
5076
diff
changeset
|
62 |
#ifdef ASSERT |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
5076
diff
changeset
|
63 |
if (gch->collector_policy()->should_clear_all_soft_refs()) { |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
5076
diff
changeset
|
64 |
assert(clear_all_softrefs, "Policy should have been checked earlier"); |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
5076
diff
changeset
|
65 |
} |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
5076
diff
changeset
|
66 |
#endif |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
5076
diff
changeset
|
67 |
|
1 | 68 |
// hook up weak ref data so it can be used during Mark-Sweep |
69 |
assert(ref_processor() == NULL, "no stomping"); |
|
1606
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
1388
diff
changeset
|
70 |
assert(rp != NULL, "should be non-NULL"); |
32606
fdaa30d06ada
8129417: Oop iteration clean-up to remove oop_ms_follow_contents
sjohanss
parents:
31358
diff
changeset
|
71 |
set_ref_processor(rp); |
1610
5dddd195cc86
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
parents:
1606
diff
changeset
|
72 |
rp->setup_policy(clear_all_softrefs); |
1 | 73 |
|
18025 | 74 |
gch->trace_heap_before_gc(_gc_tracer); |
1 | 75 |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13195
diff
changeset
|
76 |
// When collecting the permanent generation Method*s may be moving, |
1 | 77 |
// so we either have to flush all bcp data or convert it into bci. |
78 |
CodeCache::gc_prologue(); |
|
79 |
||
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13195
diff
changeset
|
80 |
// Increment the invocation count |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13195
diff
changeset
|
81 |
_total_invocations++; |
1 | 82 |
|
83 |
// Capture used regions for each generation that will be |
|
84 |
// subject to collection, so that card table adjustments can |
|
85 |
// be made intelligently (see clear / invalidate further below). |
|
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31354
diff
changeset
|
86 |
gch->save_used_regions(); |
1 | 87 |
|
88 |
allocate_stacks(); |
|
89 |
||
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31354
diff
changeset
|
90 |
mark_sweep_phase1(clear_all_softrefs); |
1 | 91 |
|
92 |
mark_sweep_phase2(); |
|
93 |
||
94 |
// Don't add any more derived pointers during phase3 |
|
33160
c59f1676d27e
8136421: JEP 243: Java-Level JVM Compiler Interface
twisti
parents:
32606
diff
changeset
|
95 |
#if defined(COMPILER2) || INCLUDE_JVMCI |
c59f1676d27e
8136421: JEP 243: Java-Level JVM Compiler Interface
twisti
parents:
32606
diff
changeset
|
96 |
assert(DerivedPointerTable::is_active(), "Sanity"); |
c59f1676d27e
8136421: JEP 243: Java-Level JVM Compiler Interface
twisti
parents:
32606
diff
changeset
|
97 |
DerivedPointerTable::set_active(false); |
c59f1676d27e
8136421: JEP 243: Java-Level JVM Compiler Interface
twisti
parents:
32606
diff
changeset
|
98 |
#endif |
1 | 99 |
|
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31354
diff
changeset
|
100 |
mark_sweep_phase3(); |
1 | 101 |
|
102 |
mark_sweep_phase4(); |
|
103 |
||
104 |
restore_marks(); |
|
105 |
||
106 |
// Set saved marks for allocation profiler (and other things? -- dld) |
|
107 |
// (Should this be in general part?) |
|
108 |
gch->save_marks(); |
|
109 |
||
110 |
deallocate_stacks(); |
|
111 |
||
29684
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
112 |
// If compaction completely evacuated the young generation then we |
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
113 |
// can clear the card table. Otherwise, we must invalidate |
1 | 114 |
// it (consider all cards dirty). In the future, we might consider doing |
115 |
// compaction within generations only, and doing card-table sliding. |
|
33212 | 116 |
CardTableRS* rs = gch->rem_set(); |
29684
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
117 |
Generation* old_gen = gch->old_gen(); |
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
118 |
|
1 | 119 |
// Clear/invalidate below make use of the "prev_used_regions" saved earlier. |
29684
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
120 |
if (gch->young_gen()->used() == 0) { |
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
121 |
// We've evacuated the young generation. |
19289
213031f03f61
8023021: Unnecessary clearing of the card table introduced by the fix for JDK-8023013
brutisso
parents:
19286
diff
changeset
|
122 |
rs->clear_into_younger(old_gen); |
1 | 123 |
} else { |
124 |
// Invalidate the cards corresponding to the currently used |
|
19289
213031f03f61
8023021: Unnecessary clearing of the card table introduced by the fix for JDK-8023013
brutisso
parents:
19286
diff
changeset
|
125 |
// region and clear those corresponding to the evacuated region. |
213031f03f61
8023021: Unnecessary clearing of the card table introduced by the fix for JDK-8023013
brutisso
parents:
19286
diff
changeset
|
126 |
rs->invalidate_or_clear(old_gen); |
1 | 127 |
} |
128 |
||
129 |
CodeCache::gc_epilogue(); |
|
7918
ce1e4ae77aea
7012505: BreakpointWithFullGC.sh fails with Internal Error (src/share/vm/oops/methodOop.cpp:220)
kamg
parents:
7397
diff
changeset
|
130 |
JvmtiExport::gc_epilogue(); |
1 | 131 |
|
132 |
// refs processing: clean slate |
|
32606
fdaa30d06ada
8129417: Oop iteration clean-up to remove oop_ms_follow_contents
sjohanss
parents:
31358
diff
changeset
|
133 |
set_ref_processor(NULL); |
1 | 134 |
|
135 |
// Update heap occupancy information which is used as |
|
136 |
// input to soft ref clearing policy at the next gc. |
|
137 |
Universe::update_heap_info_at_gc(); |
|
138 |
||
139 |
// Update time of last gc for all generations we collected |
|
22551 | 140 |
// (which currently is all the generations in the heap). |
141 |
// We need to use a monotonically non-decreasing time in ms |
|
11755 | 142 |
// or we will see time-warp warnings and os::javaTimeMillis() |
143 |
// does not guarantee monotonicity. |
|
144 |
jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
|
145 |
gch->update_time_of_last_gc(now); |
|
18025 | 146 |
|
147 |
gch->trace_heap_after_gc(_gc_tracer); |
|
1 | 148 |
} |
149 |
||
150 |
void GenMarkSweep::allocate_stacks() { |
|
151 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
|
29684
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
152 |
// Scratch request on behalf of old generation; will do no allocation. |
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
153 |
ScratchBlock* scratch = gch->gather_scratch(gch->old_gen(), 0); |
1 | 154 |
|
155 |
// $$$ To cut a corner, we'll only use the first scratch block, and then |
|
156 |
// revert to malloc. |
|
157 |
if (scratch != NULL) { |
|
158 |
_preserved_count_max = |
|
159 |
scratch->num_words * HeapWordSize / sizeof(PreservedMark); |
|
160 |
} else { |
|
161 |
_preserved_count_max = 0; |
|
162 |
} |
|
163 |
||
164 |
_preserved_marks = (PreservedMark*)scratch; |
|
165 |
_preserved_count = 0; |
|
166 |
} |
|
167 |
||
168 |
||
169 |
void GenMarkSweep::deallocate_stacks() { |
|
1388 | 170 |
if (!UseG1GC) { |
171 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
|
172 |
gch->release_scratch(); |
|
173 |
} |
|
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
174 |
|
6762
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
175 |
_preserved_mark_stack.clear(true); |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
176 |
_preserved_oop_stack.clear(true); |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
177 |
_marking_stack.clear(); |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
178 |
_objarray_stack.clear(true); |
1 | 179 |
} |
180 |
||
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31354
diff
changeset
|
181 |
void GenMarkSweep::mark_sweep_phase1(bool clear_all_softrefs) { |
1 | 182 |
// Recursively traverse all live objects and mark them |
37146 | 183 |
GCTraceTime(Info, gc, phases) tm("Phase 1: Mark live objects", _gc_timer); |
1 | 184 |
|
185 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
|
186 |
||
187 |
// Because follow_root_closure is created statically, cannot |
|
188 |
// use OopsInGenClosure constructor which takes a generation, |
|
189 |
// as the Universe has not been created when the static constructors |
|
190 |
// are run. |
|
29684
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
191 |
follow_root_closure.set_orig_generation(gch->old_gen()); |
1 | 192 |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13195
diff
changeset
|
193 |
// Need new claim bits before marking starts. |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13195
diff
changeset
|
194 |
ClassLoaderDataGraph::clear_claimed_marks(); |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13195
diff
changeset
|
195 |
|
30868
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
196 |
{ |
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
197 |
StrongRootsScope srs(1); |
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
198 |
|
41683
cd5d2527e163
8165949: Serial and ConcMarkSweep do not unload strings when class unloading is disabled
sjohanss
parents:
41682
diff
changeset
|
199 |
gch->full_process_roots(&srs, |
cd5d2527e163
8165949: Serial and ConcMarkSweep do not unload strings when class unloading is disabled
sjohanss
parents:
41682
diff
changeset
|
200 |
false, // not the adjust phase |
cd5d2527e163
8165949: Serial and ConcMarkSweep do not unload strings when class unloading is disabled
sjohanss
parents:
41682
diff
changeset
|
201 |
GenCollectedHeap::SO_None, |
cd5d2527e163
8165949: Serial and ConcMarkSweep do not unload strings when class unloading is disabled
sjohanss
parents:
41682
diff
changeset
|
202 |
ClassUnloading, // only strong roots if ClassUnloading |
cd5d2527e163
8165949: Serial and ConcMarkSweep do not unload strings when class unloading is disabled
sjohanss
parents:
41682
diff
changeset
|
203 |
// is enabled |
cd5d2527e163
8165949: Serial and ConcMarkSweep do not unload strings when class unloading is disabled
sjohanss
parents:
41682
diff
changeset
|
204 |
&follow_root_closure, |
cd5d2527e163
8165949: Serial and ConcMarkSweep do not unload strings when class unloading is disabled
sjohanss
parents:
41682
diff
changeset
|
205 |
&follow_cld_closure); |
30868
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
206 |
} |
1 | 207 |
|
208 |
// Process reference objects found during marking |
|
209 |
{ |
|
37146 | 210 |
GCTraceTime(Debug, gc, phases) tm_m("Reference Processing", gc_timer()); |
211 |
||
1610
5dddd195cc86
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
parents:
1606
diff
changeset
|
212 |
ref_processor()->setup_policy(clear_all_softrefs); |
18025 | 213 |
const ReferenceProcessorStats& stats = |
214 |
ref_processor()->process_discovered_references( |
|
33107
77bf0d2069a3
8134953: Make the GC ID available in a central place
brutisso
parents:
32606
diff
changeset
|
215 |
&is_alive, &keep_alive, &follow_stack_closure, NULL, _gc_timer); |
18025 | 216 |
gc_tracer()->report_gc_reference_stats(stats); |
1 | 217 |
} |
218 |
||
17114
b341b4c63384
8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading
stefank
parents:
17105
diff
changeset
|
219 |
// This is the point where the entire marking should have completed. |
b341b4c63384
8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading
stefank
parents:
17105
diff
changeset
|
220 |
assert(_marking_stack.is_empty(), "Marking should have completed"); |
b341b4c63384
8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading
stefank
parents:
17105
diff
changeset
|
221 |
|
37140
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
35061
diff
changeset
|
222 |
{ |
37146 | 223 |
GCTraceTime(Debug, gc, phases) tm_m("Class Unloading", gc_timer()); |
1 | 224 |
|
37140
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
35061
diff
changeset
|
225 |
// Unload classes and purge the SystemDictionary. |
46505
fd4bc78630b1
8174749: Use hash table/oops for MemberName table
coleenp
parents:
41683
diff
changeset
|
226 |
bool purged_class = SystemDictionary::do_unloading(&is_alive, gc_timer()); |
37140
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
35061
diff
changeset
|
227 |
|
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
35061
diff
changeset
|
228 |
// Unload nmethods. |
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
35061
diff
changeset
|
229 |
CodeCache::do_unloading(&is_alive, purged_class); |
1 | 230 |
|
37140
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
35061
diff
changeset
|
231 |
// Prune dead klasses from subklass/sibling/implementor lists. |
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
35061
diff
changeset
|
232 |
Klass::clean_weak_klass_links(&is_alive); |
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
35061
diff
changeset
|
233 |
} |
3696 | 234 |
|
37140
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
35061
diff
changeset
|
235 |
{ |
37146 | 236 |
GCTraceTime(Debug, gc, phases) t("Scrub String Table", gc_timer()); |
37140
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
35061
diff
changeset
|
237 |
// Delete entries for dead interned strings. |
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
35061
diff
changeset
|
238 |
StringTable::unlink(&is_alive); |
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
35061
diff
changeset
|
239 |
} |
17114
b341b4c63384
8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading
stefank
parents:
17105
diff
changeset
|
240 |
|
37140
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
35061
diff
changeset
|
241 |
{ |
37146 | 242 |
GCTraceTime(Debug, gc, phases) t("Scrub Symbol Table", gc_timer()); |
37140
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
35061
diff
changeset
|
243 |
// Clean up unreferenced symbols in symbol table. |
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
35061
diff
changeset
|
244 |
SymbolTable::unlink(); |
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
35061
diff
changeset
|
245 |
} |
18025 | 246 |
|
247 |
gc_tracer()->report_object_count_after_gc(&is_alive); |
|
1 | 248 |
} |
249 |
||
250 |
||
251 |
void GenMarkSweep::mark_sweep_phase2() { |
|
252 |
// Now all live objects are marked, compute the new object addresses. |
|
253 |
||
254 |
// It is imperative that we traverse perm_gen LAST. If dead space is |
|
255 |
// allowed a range of dead object may get overwritten by a dead int |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13195
diff
changeset
|
256 |
// array. If perm_gen is not traversed last a Klass* may get |
1 | 257 |
// overwritten. This is fine since it is dead, but if the class has dead |
258 |
// instances we have to skip them, and in order to find their size we |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13195
diff
changeset
|
259 |
// need the Klass*! |
1 | 260 |
// |
261 |
// It is not required that we traverse spaces in the same order in |
|
262 |
// phase2, phase3 and phase4, but the ValidateMarkSweep live oops |
|
263 |
// tracking expects us to do so. See comment under phase4. |
|
264 |
||
265 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
|
266 |
||
37146 | 267 |
GCTraceTime(Info, gc, phases) tm("Phase 2: Compute new object addresses", _gc_timer); |
1 | 268 |
|
269 |
gch->prepare_for_compaction(); |
|
270 |
} |
|
271 |
||
272 |
class GenAdjustPointersClosure: public GenCollectedHeap::GenClosure { |
|
273 |
public: |
|
274 |
void do_generation(Generation* gen) { |
|
275 |
gen->adjust_pointers(); |
|
276 |
} |
|
277 |
}; |
|
278 |
||
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31354
diff
changeset
|
279 |
void GenMarkSweep::mark_sweep_phase3() { |
1 | 280 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
281 |
||
282 |
// Adjust the pointers to reflect the new locations |
|
37146 | 283 |
GCTraceTime(Info, gc, phases) tm("Phase 3: Adjust pointers", gc_timer()); |
1 | 284 |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13195
diff
changeset
|
285 |
// Need new claim bits for the pointer adjustment tracing. |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13195
diff
changeset
|
286 |
ClassLoaderDataGraph::clear_claimed_marks(); |
1 | 287 |
|
17105
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
15088
diff
changeset
|
288 |
// Because the closure below is created statically, we cannot |
1 | 289 |
// use OopsInGenClosure constructor which takes a generation, |
290 |
// as the Universe has not been created when the static constructors |
|
291 |
// are run. |
|
29684
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
292 |
adjust_pointer_closure.set_orig_generation(gch->old_gen()); |
1 | 293 |
|
30868
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
294 |
{ |
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
295 |
StrongRootsScope srs(1); |
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
296 |
|
41683
cd5d2527e163
8165949: Serial and ConcMarkSweep do not unload strings when class unloading is disabled
sjohanss
parents:
41682
diff
changeset
|
297 |
gch->full_process_roots(&srs, |
cd5d2527e163
8165949: Serial and ConcMarkSweep do not unload strings when class unloading is disabled
sjohanss
parents:
41682
diff
changeset
|
298 |
true, // this is the adjust phase |
cd5d2527e163
8165949: Serial and ConcMarkSweep do not unload strings when class unloading is disabled
sjohanss
parents:
41682
diff
changeset
|
299 |
GenCollectedHeap::SO_AllCodeCache, |
cd5d2527e163
8165949: Serial and ConcMarkSweep do not unload strings when class unloading is disabled
sjohanss
parents:
41682
diff
changeset
|
300 |
false, // all roots |
cd5d2527e163
8165949: Serial and ConcMarkSweep do not unload strings when class unloading is disabled
sjohanss
parents:
41682
diff
changeset
|
301 |
&adjust_pointer_closure, |
cd5d2527e163
8165949: Serial and ConcMarkSweep do not unload strings when class unloading is disabled
sjohanss
parents:
41682
diff
changeset
|
302 |
&adjust_cld_closure); |
30868
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
303 |
} |
1 | 304 |
|
22882
195c8f70d605
8034761: Remove the do_code_roots parameter from process_strong_roots
stefank
parents:
22551
diff
changeset
|
305 |
gch->gen_process_weak_roots(&adjust_pointer_closure); |
1 | 306 |
|
307 |
adjust_marks(); |
|
308 |
GenAdjustPointersClosure blk; |
|
309 |
gch->generation_iterate(&blk, true); |
|
310 |
} |
|
311 |
||
312 |
class GenCompactClosure: public GenCollectedHeap::GenClosure { |
|
313 |
public: |
|
314 |
void do_generation(Generation* gen) { |
|
315 |
gen->compact(); |
|
316 |
} |
|
317 |
}; |
|
318 |
||
319 |
void GenMarkSweep::mark_sweep_phase4() { |
|
320 |
// All pointers are now adjusted, move objects accordingly |
|
321 |
||
322 |
// It is imperative that we traverse perm_gen first in phase4. All |
|
323 |
// classes must be allocated earlier than their instances, and traversing |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13195
diff
changeset
|
324 |
// perm_gen first makes sure that all Klass*s have moved to their new |
1 | 325 |
// location before any instance does a dispatch through it's klass! |
326 |
||
327 |
// The ValidateMarkSweep live oops tracking expects us to traverse spaces |
|
328 |
// in the same order in phase2, phase3 and phase4. We don't quite do that |
|
329 |
// here (perm_gen first rather than last), so we tell the validate code |
|
330 |
// to use a higher index (saved from phase2) when verifying perm_gen. |
|
331 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
|
332 |
||
37146 | 333 |
GCTraceTime(Info, gc, phases) tm("Phase 4: Move objects", _gc_timer); |
1 | 334 |
|
335 |
GenCompactClosure blk; |
|
336 |
gch->generation_iterate(&blk, true); |
|
337 |
} |