author | johnc |
Tue, 18 Jun 2013 12:31:07 -0700 | |
changeset 18091 | ddde9f0f414d |
parent 18025 | b7bcf7497f93 |
child 19286 | 48394008c803 |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright (c) 2001, 2013, 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_implementation/shared/gcHeapSummary.hpp" |
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#include "gc_implementation/shared/gcTimer.hpp" |
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#include "gc_implementation/shared/gcTrace.hpp" |
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#include "gc_implementation/shared/gcTraceTime.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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GCTraceTime t1(GCCauseString("Full GC", gch->gc_cause()), PrintGC && !PrintGCDetails, true, NULL); |
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gch->trace_heap_before_gc(_gc_tracer); |
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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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mark_sweep_phase4(); |
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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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gch->trace_heap_after_gc(_gc_tracer); |
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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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} |
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void GenMarkSweep::deallocate_stacks() { |
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if (!UseG1GC) { |
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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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} |
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void GenMarkSweep::mark_sweep_phase1(int level, |
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bool clear_all_softrefs) { |
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// Recursively traverse all live objects and mark them |
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GCTraceTime tm("phase 1", PrintGC && Verbose, true, _gc_timer); |
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trace(" 1"); |
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GenCollectedHeap* gch = GenCollectedHeap::heap(); |
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// Because follow_root_closure is created statically, cannot |
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// use OopsInGenClosure constructor which takes a generation, |
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// as the Universe has not been created when the static constructors |
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// are run. |
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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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gch->gen_process_strong_roots(level, |
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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 | 226 |
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// Process reference objects found during marking |
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{ |
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ref_processor()->setup_policy(clear_all_softrefs); |
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const ReferenceProcessorStats& stats = |
231 |
ref_processor()->process_discovered_references( |
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&is_alive, &keep_alive, &follow_stack_closure, NULL, _gc_timer); |
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gc_tracer()->report_gc_reference_stats(stats); |
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} |
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// This is the point where the entire marking should have completed. |
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assert(_marking_stack.is_empty(), "Marking should have completed"); |
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// Unload classes and purge the SystemDictionary. |
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bool purged_class = SystemDictionary::do_unloading(&is_alive); |
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// Unload nmethods. |
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CodeCache::do_unloading(&is_alive, purged_class); |
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// Prune dead klasses from subklass/sibling/implementor lists. |
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Klass::clean_weak_klass_links(&is_alive); |
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// Delete entries for dead interned strings. |
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StringTable::unlink(&is_alive); |
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// Clean up unreferenced symbols in symbol table. |
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SymbolTable::unlink(); |
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gc_tracer()->report_object_count_after_gc(&is_alive); |
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1 | 255 |
} |
256 |
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257 |
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258 |
void GenMarkSweep::mark_sweep_phase2() { |
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259 |
// Now all live objects are marked, compute the new object addresses. |
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260 |
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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 | 264 |
// overwritten. This is fine since it is dead, but if the class has dead |
265 |
// instances we have to skip them, and in order to find their size we |
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// need the Klass*! |
1 | 267 |
// |
268 |
// It is not required that we traverse spaces in the same order in |
|
269 |
// phase2, phase3 and phase4, but the ValidateMarkSweep live oops |
|
270 |
// tracking expects us to do so. See comment under phase4. |
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271 |
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272 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
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273 |
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18025 | 274 |
GCTraceTime tm("phase 2", PrintGC && Verbose, true, _gc_timer); |
1 | 275 |
trace("2"); |
276 |
||
277 |
gch->prepare_for_compaction(); |
|
278 |
} |
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279 |
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280 |
class GenAdjustPointersClosure: public GenCollectedHeap::GenClosure { |
|
281 |
public: |
|
282 |
void do_generation(Generation* gen) { |
|
283 |
gen->adjust_pointers(); |
|
284 |
} |
|
285 |
}; |
|
286 |
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287 |
void GenMarkSweep::mark_sweep_phase3(int level) { |
|
288 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
|
289 |
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290 |
// Adjust the pointers to reflect the new locations |
|
18025 | 291 |
GCTraceTime tm("phase 3", PrintGC && Verbose, true, _gc_timer); |
1 | 292 |
trace("3"); |
293 |
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// Need new claim bits for the pointer adjustment tracing. |
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ClassLoaderDataGraph::clear_claimed_marks(); |
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// Because the closure below is created statically, we cannot |
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// use OopsInGenClosure constructor which takes a generation, |
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// as the Universe has not been created when the static constructors |
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// are run. |
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adjust_pointer_closure.set_orig_generation(gch->get_gen(level)); |
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gch->gen_process_strong_roots(level, |
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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_AllClasses, |
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&adjust_pointer_closure, |
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false, // do not walk code |
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&adjust_pointer_closure, |
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&adjust_klass_closure); |
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// Now adjust pointers in remaining weak roots. (All of which should |
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// have been cleared if they pointed to non-surviving objects.) |
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CodeBlobToOopClosure adjust_code_pointer_closure(&adjust_pointer_closure, |
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/*do_marking=*/ false); |
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gch->gen_process_weak_roots(&adjust_pointer_closure, |
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&adjust_code_pointer_closure); |
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adjust_marks(); |
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GenAdjustPointersClosure blk; |
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gch->generation_iterate(&blk, true); |
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} |
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class GenCompactClosure: public GenCollectedHeap::GenClosure { |
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public: |
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void do_generation(Generation* gen) { |
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gen->compact(); |
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} |
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}; |
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void GenMarkSweep::mark_sweep_phase4() { |
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// All pointers are now adjusted, move objects accordingly |
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// It is imperative that we traverse perm_gen first in phase4. All |
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// classes must be allocated earlier than their instances, and traversing |
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// perm_gen first makes sure that all Klass*s have moved to their new |
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// location before any instance does a dispatch through it's klass! |
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// The ValidateMarkSweep live oops tracking expects us to traverse spaces |
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// in the same order in phase2, phase3 and phase4. We don't quite do that |
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// here (perm_gen first rather than last), so we tell the validate code |
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// to use a higher index (saved from phase2) when verifying perm_gen. |
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GenCollectedHeap* gch = GenCollectedHeap::heap(); |
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GCTraceTime tm("phase 4", PrintGC && Verbose, true, _gc_timer); |
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trace("4"); |
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GenCompactClosure blk; |
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gch->generation_iterate(&blk, true); |
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} |