author | stefank |
Tue, 27 Nov 2012 14:20:21 +0100 | |
changeset 14583 | d70ee55535f4 |
parent 13878 | 6e6a462a6cff |
child 15088 | 8875e774f1a3 |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#include "precompiled.hpp" |
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#include "classfile/javaClasses.hpp" |
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#include "classfile/symbolTable.hpp" |
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#include "classfile/systemDictionary.hpp" |
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#include "classfile/vmSymbols.hpp" |
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#include "code/codeCache.hpp" |
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#include "code/icBuffer.hpp" |
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#include "gc_interface/collectedHeap.inline.hpp" |
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#include "memory/genCollectedHeap.hpp" |
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#include "memory/genMarkSweep.hpp" |
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#include "memory/genOopClosures.inline.hpp" |
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#include "memory/generation.inline.hpp" |
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#include "memory/modRefBarrierSet.hpp" |
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#include "memory/referencePolicy.hpp" |
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#include "memory/space.hpp" |
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#include "oops/instanceRefKlass.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "prims/jvmtiExport.hpp" |
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#include "runtime/fprofiler.hpp" |
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#include "runtime/handles.inline.hpp" |
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#include "runtime/synchronizer.hpp" |
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#include "runtime/thread.inline.hpp" |
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#include "runtime/vmThread.hpp" |
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#include "utilities/copy.hpp" |
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#include "utilities/events.hpp" |
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void GenMarkSweep::invoke_at_safepoint(int level, ReferenceProcessor* rp, |
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bool clear_all_softrefs) { |
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assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); |
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GenCollectedHeap* gch = GenCollectedHeap::heap(); |
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#ifdef ASSERT |
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if (gch->collector_policy()->should_clear_all_soft_refs()) { |
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assert(clear_all_softrefs, "Policy should have been checked earlier"); |
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} |
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#endif |
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// hook up weak ref data so it can be used during Mark-Sweep |
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assert(ref_processor() == NULL, "no stomping"); |
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assert(rp != NULL, "should be non-NULL"); |
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_ref_processor = rp; |
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rp->setup_policy(clear_all_softrefs); |
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TraceTime t1(GCCauseString("Full GC", gch->gc_cause()), PrintGC && !PrintGCDetails, true, gclog_or_tty); |
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// When collecting the permanent generation Method*s may be moving, |
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// so we either have to flush all bcp data or convert it into bci. |
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CodeCache::gc_prologue(); |
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Threads::gc_prologue(); |
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// Increment the invocation count |
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_total_invocations++; |
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// Capture heap size before collection for printing. |
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size_t gch_prev_used = gch->used(); |
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// Some of the card table updates below assume that the perm gen is |
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// also being collected. |
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assert(level == gch->n_gens() - 1, |
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"All generations are being collected, ergo perm gen too."); |
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// Capture used regions for each generation that will be |
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// subject to collection, so that card table adjustments can |
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// be made intelligently (see clear / invalidate further below). |
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gch->save_used_regions(level); |
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allocate_stacks(); |
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mark_sweep_phase1(level, clear_all_softrefs); |
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mark_sweep_phase2(); |
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// Don't add any more derived pointers during phase3 |
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COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity")); |
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COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); |
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mark_sweep_phase3(level); |
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VALIDATE_MARK_SWEEP_ONLY( |
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if (ValidateMarkSweep) { |
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guarantee(_root_refs_stack->length() == 0, "should be empty by now"); |
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} |
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) |
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mark_sweep_phase4(); |
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VALIDATE_MARK_SWEEP_ONLY( |
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if (ValidateMarkSweep) { |
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guarantee(_live_oops->length() == _live_oops_moved_to->length(), |
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"should be the same size"); |
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} |
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) |
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restore_marks(); |
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// Set saved marks for allocation profiler (and other things? -- dld) |
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// (Should this be in general part?) |
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gch->save_marks(); |
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deallocate_stacks(); |
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// If compaction completely evacuated all generations younger than this |
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// one, then we can clear the card table. Otherwise, we must invalidate |
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// it (consider all cards dirty). In the future, we might consider doing |
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// compaction within generations only, and doing card-table sliding. |
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bool all_empty = true; |
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for (int i = 0; all_empty && i < level; i++) { |
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Generation* g = gch->get_gen(i); |
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all_empty = all_empty && gch->get_gen(i)->used() == 0; |
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} |
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GenRemSet* rs = gch->rem_set(); |
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// Clear/invalidate below make use of the "prev_used_regions" saved earlier. |
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if (all_empty) { |
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// We've evacuated all generations below us. |
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Generation* g = gch->get_gen(level); |
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rs->clear_into_younger(g); |
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} else { |
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// Invalidate the cards corresponding to the currently used |
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// region and clear those corresponding to the evacuated region |
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// of all generations just collected (i.e. level and younger). |
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rs->invalidate_or_clear(gch->get_gen(level), |
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true /* younger */); |
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} |
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Threads::gc_epilogue(); |
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CodeCache::gc_epilogue(); |
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JvmtiExport::gc_epilogue(); |
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if (PrintGC && !PrintGCDetails) { |
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gch->print_heap_change(gch_prev_used); |
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} |
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// refs processing: clean slate |
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_ref_processor = NULL; |
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// Update heap occupancy information which is used as |
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// input to soft ref clearing policy at the next gc. |
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Universe::update_heap_info_at_gc(); |
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// Update time of last gc for all generations we collected |
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// (which curently is all the generations in the heap). |
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// We need to use a monotonically non-deccreasing time in ms |
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// or we will see time-warp warnings and os::javaTimeMillis() |
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// does not guarantee monotonicity. |
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jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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gch->update_time_of_last_gc(now); |
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} |
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void GenMarkSweep::allocate_stacks() { |
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GenCollectedHeap* gch = GenCollectedHeap::heap(); |
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// Scratch request on behalf of oldest generation; will do no |
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// allocation. |
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ScratchBlock* scratch = gch->gather_scratch(gch->_gens[gch->_n_gens-1], 0); |
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// $$$ To cut a corner, we'll only use the first scratch block, and then |
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// revert to malloc. |
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if (scratch != NULL) { |
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_preserved_count_max = |
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scratch->num_words * HeapWordSize / sizeof(PreservedMark); |
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} else { |
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_preserved_count_max = 0; |
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} |
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_preserved_marks = (PreservedMark*)scratch; |
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_preserved_count = 0; |
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#ifdef VALIDATE_MARK_SWEEP |
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if (ValidateMarkSweep) { |
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_root_refs_stack = new (ResourceObj::C_HEAP, mtGC) GrowableArray<void*>(100, true); |
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_other_refs_stack = new (ResourceObj::C_HEAP, mtGC) GrowableArray<void*>(100, true); |
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_adjusted_pointers = new (ResourceObj::C_HEAP, mtGC) GrowableArray<void*>(100, true); |
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_live_oops = new (ResourceObj::C_HEAP, mtGC) GrowableArray<oop>(100, true); |
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_live_oops_moved_to = new (ResourceObj::C_HEAP, mtGC) GrowableArray<oop>(100, true); |
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_live_oops_size = new (ResourceObj::C_HEAP, mtGC) GrowableArray<size_t>(100, true); |
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} |
200 |
if (RecordMarkSweepCompaction) { |
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if (_cur_gc_live_oops == NULL) { |
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_cur_gc_live_oops = new(ResourceObj::C_HEAP, mtGC) GrowableArray<HeapWord*>(100, true); |
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_cur_gc_live_oops_moved_to = new(ResourceObj::C_HEAP, mtGC) GrowableArray<HeapWord*>(100, true); |
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_cur_gc_live_oops_size = new(ResourceObj::C_HEAP, mtGC) GrowableArray<size_t>(100, true); |
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_last_gc_live_oops = new(ResourceObj::C_HEAP, mtGC) GrowableArray<HeapWord*>(100, true); |
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_last_gc_live_oops_moved_to = new(ResourceObj::C_HEAP, mtGC) GrowableArray<HeapWord*>(100, true); |
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_last_gc_live_oops_size = new(ResourceObj::C_HEAP, mtGC) GrowableArray<size_t>(100, true); |
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} else { |
209 |
_cur_gc_live_oops->clear(); |
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_cur_gc_live_oops_moved_to->clear(); |
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_cur_gc_live_oops_size->clear(); |
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} |
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} |
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#endif |
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} |
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216 |
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void GenMarkSweep::deallocate_stacks() { |
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if (!UseG1GC) { |
220 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
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gch->release_scratch(); |
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} |
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_preserved_mark_stack.clear(true); |
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_preserved_oop_stack.clear(true); |
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_marking_stack.clear(); |
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_objarray_stack.clear(true); |
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#ifdef VALIDATE_MARK_SWEEP |
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230 |
if (ValidateMarkSweep) { |
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delete _root_refs_stack; |
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232 |
delete _other_refs_stack; |
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233 |
delete _adjusted_pointers; |
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234 |
delete _live_oops; |
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delete _live_oops_size; |
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236 |
delete _live_oops_moved_to; |
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237 |
_live_oops_index = 0; |
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238 |
_live_oops_index_at_perm = 0; |
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239 |
} |
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240 |
#endif |
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241 |
} |
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242 |
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243 |
void GenMarkSweep::mark_sweep_phase1(int level, |
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244 |
bool clear_all_softrefs) { |
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245 |
// Recursively traverse all live objects and mark them |
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246 |
TraceTime tm("phase 1", PrintGC && Verbose, true, gclog_or_tty); |
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247 |
trace(" 1"); |
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248 |
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VALIDATE_MARK_SWEEP_ONLY(reset_live_oop_tracking()); |
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GenCollectedHeap* gch = GenCollectedHeap::heap(); |
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252 |
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253 |
// Because follow_root_closure is created statically, cannot |
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254 |
// use OopsInGenClosure constructor which takes a generation, |
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255 |
// as the Universe has not been created when the static constructors |
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256 |
// are run. |
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257 |
follow_root_closure.set_orig_generation(gch->get_gen(level)); |
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// Need new claim bits before marking starts. |
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ClassLoaderDataGraph::clear_claimed_marks(); |
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1 | 262 |
gch->gen_process_strong_roots(level, |
263 |
false, // Younger gens are not roots. |
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true, // activate StrongRootsScope |
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false, // not scavenging |
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SharedHeap::SO_SystemClasses, |
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&follow_root_closure, |
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true, // walk code active on stacks |
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&follow_root_closure, |
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&follow_klass_closure); |
1 | 271 |
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272 |
// Process reference objects found during marking |
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273 |
{ |
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ref_processor()->setup_policy(clear_all_softrefs); |
1 | 275 |
ref_processor()->process_discovered_references( |
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&is_alive, &keep_alive, &follow_stack_closure, NULL); |
1 | 277 |
} |
278 |
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279 |
// Follow system dictionary roots and unload classes |
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280 |
bool purged_class = SystemDictionary::do_unloading(&is_alive); |
|
281 |
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// Follow code cache roots |
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CodeCache::do_unloading(&is_alive, purged_class); |
1 | 284 |
follow_stack(); // Flush marking stack |
285 |
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286 |
// Update subklass/sibling/implementor links of live klasses |
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Klass::clean_weak_klass_links(&is_alive); |
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assert(_marking_stack.is_empty(), "just drained"); |
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// Visit interned string tables and delete unmarked oops |
1 | 291 |
StringTable::unlink(&is_alive); |
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// Clean up unreferenced symbols in symbol table. |
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SymbolTable::unlink(); |
1 | 294 |
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assert(_marking_stack.is_empty(), "stack should be empty by now"); |
1 | 296 |
} |
297 |
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298 |
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void GenMarkSweep::mark_sweep_phase2() { |
|
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// Now all live objects are marked, compute the new object addresses. |
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// It is imperative that we traverse perm_gen LAST. If dead space is |
|
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// allowed a range of dead object may get overwritten by a dead int |
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// array. If perm_gen is not traversed last a Klass* may get |
1 | 305 |
// overwritten. This is fine since it is dead, but if the class has dead |
306 |
// instances we have to skip them, and in order to find their size we |
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// need the Klass*! |
1 | 308 |
// |
309 |
// It is not required that we traverse spaces in the same order in |
|
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// phase2, phase3 and phase4, but the ValidateMarkSweep live oops |
|
311 |
// tracking expects us to do so. See comment under phase4. |
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GenCollectedHeap* gch = GenCollectedHeap::heap(); |
|
314 |
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TraceTime tm("phase 2", PrintGC && Verbose, true, gclog_or_tty); |
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trace("2"); |
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317 |
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VALIDATE_MARK_SWEEP_ONLY(reset_live_oop_tracking()); |
1 | 319 |
|
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gch->prepare_for_compaction(); |
|
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} |
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322 |
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class GenAdjustPointersClosure: public GenCollectedHeap::GenClosure { |
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public: |
|
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void do_generation(Generation* gen) { |
|
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gen->adjust_pointers(); |
|
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} |
|
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}; |
|
329 |
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330 |
void GenMarkSweep::mark_sweep_phase3(int level) { |
|
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GenCollectedHeap* gch = GenCollectedHeap::heap(); |
|
332 |
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333 |
// Adjust the pointers to reflect the new locations |
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TraceTime tm("phase 3", PrintGC && Verbose, true, gclog_or_tty); |
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trace("3"); |
|
336 |
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// Need new claim bits for the pointer adjustment tracing. |
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338 |
ClassLoaderDataGraph::clear_claimed_marks(); |
1 | 339 |
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VALIDATE_MARK_SWEEP_ONLY(reset_live_oop_tracking()); |
1 | 341 |
|
342 |
// Because the two closures below are created statically, cannot |
|
343 |
// use OopsInGenClosure constructor which takes a generation, |
|
344 |
// as the Universe has not been created when the static constructors |
|
345 |
// are run. |
|
346 |
adjust_root_pointer_closure.set_orig_generation(gch->get_gen(level)); |
|
347 |
adjust_pointer_closure.set_orig_generation(gch->get_gen(level)); |
|
348 |
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gch->gen_process_strong_roots(level, |
|
350 |
false, // Younger gens are not roots. |
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changeset
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351 |
true, // activate StrongRootsScope |
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false, // not scavenging |
1 | 353 |
SharedHeap::SO_AllClasses, |
354 |
&adjust_root_pointer_closure, |
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false, // do not walk code |
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356 |
&adjust_root_pointer_closure, |
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357 |
&adjust_klass_closure); |
1 | 358 |
|
359 |
// Now adjust pointers in remaining weak roots. (All of which should |
|
360 |
// have been cleared if they pointed to non-surviving objects.) |
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changeset
|
361 |
CodeBlobToOopClosure adjust_code_pointer_closure(&adjust_pointer_closure, |
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362 |
/*do_marking=*/ false); |
1 | 363 |
gch->gen_process_weak_roots(&adjust_root_pointer_closure, |
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changeset
|
364 |
&adjust_code_pointer_closure, |
1 | 365 |
&adjust_pointer_closure); |
366 |
||
367 |
adjust_marks(); |
|
368 |
GenAdjustPointersClosure blk; |
|
369 |
gch->generation_iterate(&blk, true); |
|
370 |
} |
|
371 |
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372 |
class GenCompactClosure: public GenCollectedHeap::GenClosure { |
|
373 |
public: |
|
374 |
void do_generation(Generation* gen) { |
|
375 |
gen->compact(); |
|
376 |
} |
|
377 |
}; |
|
378 |
||
379 |
void GenMarkSweep::mark_sweep_phase4() { |
|
380 |
// All pointers are now adjusted, move objects accordingly |
|
381 |
||
382 |
// It is imperative that we traverse perm_gen first in phase4. All |
|
383 |
// classes must be allocated earlier than their instances, and traversing |
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parents:
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diff
changeset
|
384 |
// perm_gen first makes sure that all Klass*s have moved to their new |
1 | 385 |
// location before any instance does a dispatch through it's klass! |
386 |
||
387 |
// The ValidateMarkSweep live oops tracking expects us to traverse spaces |
|
388 |
// in the same order in phase2, phase3 and phase4. We don't quite do that |
|
389 |
// here (perm_gen first rather than last), so we tell the validate code |
|
390 |
// to use a higher index (saved from phase2) when verifying perm_gen. |
|
391 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
|
392 |
||
393 |
TraceTime tm("phase 4", PrintGC && Verbose, true, gclog_or_tty); |
|
394 |
trace("4"); |
|
395 |
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diff
changeset
|
396 |
VALIDATE_MARK_SWEEP_ONLY(reset_live_oop_tracking()); |
1 | 397 |
|
398 |
GenCompactClosure blk; |
|
399 |
gch->generation_iterate(&blk, true); |
|
400 |
||
401 |
VALIDATE_MARK_SWEEP_ONLY(compaction_complete()); |
|
402 |
} |