20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaClasses.hpp"
27 #include "classfile/stringTable.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/codeCache.hpp"
31 #include "code/icBuffer.hpp"
32 #include "gc_implementation/shared/gcHeapSummary.hpp"
33 #include "gc_implementation/shared/gcTimer.hpp"
34 #include "gc_implementation/shared/gcTrace.hpp"
35 #include "gc_implementation/shared/gcTraceTime.hpp"
36 #include "gc_interface/collectedHeap.inline.hpp"
37 #include "memory/genCollectedHeap.hpp"
38 #include "memory/genMarkSweep.hpp"
39 #include "memory/genOopClosures.inline.hpp"
40 #include "memory/modRefBarrierSet.hpp"
41 #include "memory/referencePolicy.hpp"
42 #include "memory/space.hpp"
43 #include "oops/instanceRefKlass.hpp"
44 #include "oops/oop.inline.hpp"
45 #include "prims/jvmtiExport.hpp"
46 #include "runtime/fprofiler.hpp"
47 #include "runtime/handles.inline.hpp"
48 #include "runtime/synchronizer.hpp"
49 #include "runtime/thread.inline.hpp"
50 #include "runtime/vmThread.hpp"
51 #include "utilities/copy.hpp"
52 #include "utilities/events.hpp"
53 #include "utilities/stack.inline.hpp"
54
55 void GenMarkSweep::invoke_at_safepoint(int level, ReferenceProcessor* rp, bool clear_all_softrefs) {
56 guarantee(level == 1, "We always collect both old and young.");
57 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
58
59 GenCollectedHeap* gch = GenCollectedHeap::heap();
60 #ifdef ASSERT
61 if (gch->collector_policy()->should_clear_all_soft_refs()) {
62 assert(clear_all_softrefs, "Policy should have been checked earlier");
63 }
64 #endif
65
66 // hook up weak ref data so it can be used during Mark-Sweep
67 assert(ref_processor() == NULL, "no stomping");
68 assert(rp != NULL, "should be non-NULL");
69 _ref_processor = rp;
70 rp->setup_policy(clear_all_softrefs);
71
72 GCTraceTime t1(GCCauseString("Full GC", gch->gc_cause()), PrintGC && !PrintGCDetails, true, NULL, _gc_tracer->gc_id());
73
74 gch->trace_heap_before_gc(_gc_tracer);
75
76 // When collecting the permanent generation Method*s may be moving,
77 // so we either have to flush all bcp data or convert it into bci.
78 CodeCache::gc_prologue();
79
80 // Increment the invocation count
81 _total_invocations++;
82
83 // Capture heap size before collection for printing.
84 size_t gch_prev_used = gch->used();
85
86 // Capture used regions for each generation that will be
87 // subject to collection, so that card table adjustments can
88 // be made intelligently (see clear / invalidate further below).
89 gch->save_used_regions(level);
90
91 allocate_stacks();
92
93 mark_sweep_phase1(level, clear_all_softrefs);
94
95 mark_sweep_phase2();
96
97 // Don't add any more derived pointers during phase3
98 COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity"));
99 COMPILER2_PRESENT(DerivedPointerTable::set_active(false));
100
101 mark_sweep_phase3(level);
102
103 mark_sweep_phase4();
104
105 restore_marks();
106
107 // Set saved marks for allocation profiler (and other things? -- dld)
108 // (Should this be in general part?)
109 gch->save_marks();
110
111 deallocate_stacks();
112
113 // If compaction completely evacuated the young generation then we
114 // can clear the card table. Otherwise, we must invalidate
115 // it (consider all cards dirty). In the future, we might consider doing
116 // compaction within generations only, and doing card-table sliding.
117 GenRemSet* rs = gch->rem_set();
118 Generation* old_gen = gch->old_gen();
119
120 // Clear/invalidate below make use of the "prev_used_regions" saved earlier.
121 if (gch->young_gen()->used() == 0) {
166 _preserved_count_max = 0;
167 }
168
169 _preserved_marks = (PreservedMark*)scratch;
170 _preserved_count = 0;
171 }
172
173
174 void GenMarkSweep::deallocate_stacks() {
175 if (!UseG1GC) {
176 GenCollectedHeap* gch = GenCollectedHeap::heap();
177 gch->release_scratch();
178 }
179
180 _preserved_mark_stack.clear(true);
181 _preserved_oop_stack.clear(true);
182 _marking_stack.clear();
183 _objarray_stack.clear(true);
184 }
185
186 void GenMarkSweep::mark_sweep_phase1(int level,
187 bool clear_all_softrefs) {
188 // Recursively traverse all live objects and mark them
189 GCTraceTime tm("phase 1", PrintGC && Verbose, true, _gc_timer, _gc_tracer->gc_id());
190
191 GenCollectedHeap* gch = GenCollectedHeap::heap();
192
193 // Because follow_root_closure is created statically, cannot
194 // use OopsInGenClosure constructor which takes a generation,
195 // as the Universe has not been created when the static constructors
196 // are run.
197 assert(level == 1, "We don't use mark-sweep on young generations");
198 follow_root_closure.set_orig_generation(gch->old_gen());
199
200 // Need new claim bits before marking starts.
201 ClassLoaderDataGraph::clear_claimed_marks();
202
203 gch->gen_process_roots(level,
204 false, // Younger gens are not roots.
205 true, // activate StrongRootsScope
206 GenCollectedHeap::SO_None,
207 GenCollectedHeap::StrongRootsOnly,
208 &follow_root_closure,
209 &follow_root_closure,
210 &follow_cld_closure);
211
212 // Process reference objects found during marking
213 {
214 ref_processor()->setup_policy(clear_all_softrefs);
215 const ReferenceProcessorStats& stats =
216 ref_processor()->process_discovered_references(
217 &is_alive, &keep_alive, &follow_stack_closure, NULL, _gc_timer, _gc_tracer->gc_id());
218 gc_tracer()->report_gc_reference_stats(stats);
219 }
220
221 // This is the point where the entire marking should have completed.
222 assert(_marking_stack.is_empty(), "Marking should have completed");
223
251 // need the Klass*!
252 //
253 // It is not required that we traverse spaces in the same order in
254 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops
255 // tracking expects us to do so. See comment under phase4.
256
257 GenCollectedHeap* gch = GenCollectedHeap::heap();
258
259 GCTraceTime tm("phase 2", PrintGC && Verbose, true, _gc_timer, _gc_tracer->gc_id());
260
261 gch->prepare_for_compaction();
262 }
263
264 class GenAdjustPointersClosure: public GenCollectedHeap::GenClosure {
265 public:
266 void do_generation(Generation* gen) {
267 gen->adjust_pointers();
268 }
269 };
270
271 void GenMarkSweep::mark_sweep_phase3(int level) {
272 GenCollectedHeap* gch = GenCollectedHeap::heap();
273
274 // Adjust the pointers to reflect the new locations
275 GCTraceTime tm("phase 3", PrintGC && Verbose, true, _gc_timer, _gc_tracer->gc_id());
276
277 // Need new claim bits for the pointer adjustment tracing.
278 ClassLoaderDataGraph::clear_claimed_marks();
279
280 // Because the closure below is created statically, we cannot
281 // use OopsInGenClosure constructor which takes a generation,
282 // as the Universe has not been created when the static constructors
283 // are run.
284 assert(level == 1, "We don't use mark-sweep on young generations.");
285 adjust_pointer_closure.set_orig_generation(gch->old_gen());
286
287 gch->gen_process_roots(level,
288 false, // Younger gens are not roots.
289 true, // activate StrongRootsScope
290 GenCollectedHeap::SO_AllCodeCache,
291 GenCollectedHeap::StrongAndWeakRoots,
292 &adjust_pointer_closure,
293 &adjust_pointer_closure,
294 &adjust_cld_closure);
295
296 gch->gen_process_weak_roots(&adjust_pointer_closure);
297
298 adjust_marks();
299 GenAdjustPointersClosure blk;
300 gch->generation_iterate(&blk, true);
301 }
302
303 class GenCompactClosure: public GenCollectedHeap::GenClosure {
304 public:
305 void do_generation(Generation* gen) {
306 gen->compact();
307 }
|
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaClasses.hpp"
27 #include "classfile/stringTable.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/codeCache.hpp"
31 #include "code/icBuffer.hpp"
32 #include "gc_implementation/shared/gcHeapSummary.hpp"
33 #include "gc_implementation/shared/gcTimer.hpp"
34 #include "gc_implementation/shared/gcTrace.hpp"
35 #include "gc_implementation/shared/gcTraceTime.hpp"
36 #include "gc_interface/collectedHeap.inline.hpp"
37 #include "memory/genCollectedHeap.hpp"
38 #include "memory/genMarkSweep.hpp"
39 #include "memory/genOopClosures.inline.hpp"
40 #include "memory/generation.hpp"
41 #include "memory/modRefBarrierSet.hpp"
42 #include "memory/referencePolicy.hpp"
43 #include "memory/space.hpp"
44 #include "oops/instanceRefKlass.hpp"
45 #include "oops/oop.inline.hpp"
46 #include "prims/jvmtiExport.hpp"
47 #include "runtime/fprofiler.hpp"
48 #include "runtime/handles.inline.hpp"
49 #include "runtime/synchronizer.hpp"
50 #include "runtime/thread.inline.hpp"
51 #include "runtime/vmThread.hpp"
52 #include "utilities/copy.hpp"
53 #include "utilities/events.hpp"
54 #include "utilities/stack.inline.hpp"
55
56 void GenMarkSweep::invoke_at_safepoint(ReferenceProcessor* rp, bool clear_all_softrefs) {
57 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
58
59 GenCollectedHeap* gch = GenCollectedHeap::heap();
60 #ifdef ASSERT
61 if (gch->collector_policy()->should_clear_all_soft_refs()) {
62 assert(clear_all_softrefs, "Policy should have been checked earlier");
63 }
64 #endif
65
66 // hook up weak ref data so it can be used during Mark-Sweep
67 assert(ref_processor() == NULL, "no stomping");
68 assert(rp != NULL, "should be non-NULL");
69 _ref_processor = rp;
70 rp->setup_policy(clear_all_softrefs);
71
72 GCTraceTime t1(GCCauseString("Full GC", gch->gc_cause()), PrintGC && !PrintGCDetails, true, NULL, _gc_tracer->gc_id());
73
74 gch->trace_heap_before_gc(_gc_tracer);
75
76 // When collecting the permanent generation Method*s may be moving,
77 // so we either have to flush all bcp data or convert it into bci.
78 CodeCache::gc_prologue();
79
80 // Increment the invocation count
81 _total_invocations++;
82
83 // Capture heap size before collection for printing.
84 size_t gch_prev_used = gch->used();
85
86 // Capture used regions for each generation that will be
87 // subject to collection, so that card table adjustments can
88 // be made intelligently (see clear / invalidate further below).
89 gch->save_used_regions();
90
91 allocate_stacks();
92
93 mark_sweep_phase1(clear_all_softrefs);
94
95 mark_sweep_phase2();
96
97 // Don't add any more derived pointers during phase3
98 COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity"));
99 COMPILER2_PRESENT(DerivedPointerTable::set_active(false));
100
101 mark_sweep_phase3();
102
103 mark_sweep_phase4();
104
105 restore_marks();
106
107 // Set saved marks for allocation profiler (and other things? -- dld)
108 // (Should this be in general part?)
109 gch->save_marks();
110
111 deallocate_stacks();
112
113 // If compaction completely evacuated the young generation then we
114 // can clear the card table. Otherwise, we must invalidate
115 // it (consider all cards dirty). In the future, we might consider doing
116 // compaction within generations only, and doing card-table sliding.
117 GenRemSet* rs = gch->rem_set();
118 Generation* old_gen = gch->old_gen();
119
120 // Clear/invalidate below make use of the "prev_used_regions" saved earlier.
121 if (gch->young_gen()->used() == 0) {
166 _preserved_count_max = 0;
167 }
168
169 _preserved_marks = (PreservedMark*)scratch;
170 _preserved_count = 0;
171 }
172
173
174 void GenMarkSweep::deallocate_stacks() {
175 if (!UseG1GC) {
176 GenCollectedHeap* gch = GenCollectedHeap::heap();
177 gch->release_scratch();
178 }
179
180 _preserved_mark_stack.clear(true);
181 _preserved_oop_stack.clear(true);
182 _marking_stack.clear();
183 _objarray_stack.clear(true);
184 }
185
186 void GenMarkSweep::mark_sweep_phase1(bool clear_all_softrefs) {
187 // Recursively traverse all live objects and mark them
188 GCTraceTime tm("phase 1", PrintGC && Verbose, true, _gc_timer, _gc_tracer->gc_id());
189
190 GenCollectedHeap* gch = GenCollectedHeap::heap();
191
192 // Because follow_root_closure is created statically, cannot
193 // use OopsInGenClosure constructor which takes a generation,
194 // as the Universe has not been created when the static constructors
195 // are run.
196 follow_root_closure.set_orig_generation(gch->old_gen());
197
198 // Need new claim bits before marking starts.
199 ClassLoaderDataGraph::clear_claimed_marks();
200
201 gch->gen_process_roots(Generation::Old,
202 false, // Younger gens are not roots.
203 true, // activate StrongRootsScope
204 GenCollectedHeap::SO_None,
205 GenCollectedHeap::StrongRootsOnly,
206 &follow_root_closure,
207 &follow_root_closure,
208 &follow_cld_closure);
209
210 // Process reference objects found during marking
211 {
212 ref_processor()->setup_policy(clear_all_softrefs);
213 const ReferenceProcessorStats& stats =
214 ref_processor()->process_discovered_references(
215 &is_alive, &keep_alive, &follow_stack_closure, NULL, _gc_timer, _gc_tracer->gc_id());
216 gc_tracer()->report_gc_reference_stats(stats);
217 }
218
219 // This is the point where the entire marking should have completed.
220 assert(_marking_stack.is_empty(), "Marking should have completed");
221
249 // need the Klass*!
250 //
251 // It is not required that we traverse spaces in the same order in
252 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops
253 // tracking expects us to do so. See comment under phase4.
254
255 GenCollectedHeap* gch = GenCollectedHeap::heap();
256
257 GCTraceTime tm("phase 2", PrintGC && Verbose, true, _gc_timer, _gc_tracer->gc_id());
258
259 gch->prepare_for_compaction();
260 }
261
262 class GenAdjustPointersClosure: public GenCollectedHeap::GenClosure {
263 public:
264 void do_generation(Generation* gen) {
265 gen->adjust_pointers();
266 }
267 };
268
269 void GenMarkSweep::mark_sweep_phase3() {
270 GenCollectedHeap* gch = GenCollectedHeap::heap();
271
272 // Adjust the pointers to reflect the new locations
273 GCTraceTime tm("phase 3", PrintGC && Verbose, true, _gc_timer, _gc_tracer->gc_id());
274
275 // Need new claim bits for the pointer adjustment tracing.
276 ClassLoaderDataGraph::clear_claimed_marks();
277
278 // Because the closure below is created statically, we cannot
279 // use OopsInGenClosure constructor which takes a generation,
280 // as the Universe has not been created when the static constructors
281 // are run.
282 adjust_pointer_closure.set_orig_generation(gch->old_gen());
283
284 gch->gen_process_roots(Generation::Old,
285 false, // Younger gens are not roots.
286 true, // activate StrongRootsScope
287 GenCollectedHeap::SO_AllCodeCache,
288 GenCollectedHeap::StrongAndWeakRoots,
289 &adjust_pointer_closure,
290 &adjust_pointer_closure,
291 &adjust_cld_closure);
292
293 gch->gen_process_weak_roots(&adjust_pointer_closure);
294
295 adjust_marks();
296 GenAdjustPointersClosure blk;
297 gch->generation_iterate(&blk, true);
298 }
299
300 class GenCompactClosure: public GenCollectedHeap::GenClosure {
301 public:
302 void do_generation(Generation* gen) {
303 gen->compact();
304 }
|