author | sangheki |
Mon, 04 Jun 2018 21:20:16 -0700 | |
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permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2018, 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/stringTable.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/serial/genMarkSweep.hpp" |
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#include "gc/shared/collectedHeap.inline.hpp" |
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#include "gc/shared/gcHeapSummary.hpp" |
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#include "gc/shared/gcTimer.hpp" |
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#include "gc/shared/gcTrace.hpp" |
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#include "gc/shared/gcTraceTime.inline.hpp" |
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#include "gc/shared/genCollectedHeap.hpp" |
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#include "gc/shared/generation.hpp" |
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#include "gc/shared/genOopClosures.inline.hpp" |
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#include "gc/shared/modRefBarrierSet.hpp" |
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#include "gc/shared/referencePolicy.hpp" |
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#include "gc/shared/space.hpp" |
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#include "gc/shared/strongRootsScope.hpp" |
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#include "gc/shared/weakProcessor.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/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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#include "utilities/stack.inline.hpp" |
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void GenMarkSweep::invoke_at_safepoint(ReferenceProcessor* rp, 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->soft_ref_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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set_ref_processor(rp); |
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rp->setup_policy(clear_all_softrefs); |
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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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// Increment the invocation count |
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_total_invocations++; |
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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(); |
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allocate_stacks(); |
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mark_sweep_phase1(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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#if COMPILER2_OR_JVMCI |
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assert(DerivedPointerTable::is_active(), "Sanity"); |
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DerivedPointerTable::set_active(false); |
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#endif |
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mark_sweep_phase3(); |
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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 the young generation then we |
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// 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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CardTableRS* rs = gch->rem_set(); |
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Generation* old_gen = gch->old_gen(); |
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// Clear/invalidate below make use of the "prev_used_regions" saved earlier. |
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if (gch->young_gen()->used() == 0) { |
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// We've evacuated the young generation. |
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rs->clear_into_younger(old_gen); |
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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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rs->invalidate_or_clear(old_gen); |
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} |
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CodeCache::gc_epilogue(); |
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JvmtiExport::gc_epilogue(); |
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// refs processing: clean slate |
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set_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 currently is all the generations in the heap). |
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// We need to use a monotonically non-decreasing 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 old generation; will do no allocation. |
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ScratchBlock* scratch = gch->gather_scratch(gch->old_gen(), 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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GenCollectedHeap* gch = GenCollectedHeap::heap(); |
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gch->release_scratch(); |
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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(bool clear_all_softrefs) { |
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// Recursively traverse all live objects and mark them |
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GCTraceTime(Info, gc, phases) tm("Phase 1: Mark live objects", _gc_timer); |
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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->old_gen()); |
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// Need new claim bits before marking starts. |
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ClassLoaderDataGraph::clear_claimed_marks(); |
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{ |
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StrongRootsScope srs(1); |
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gch->full_process_roots(&srs, |
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false, // not the adjust phase |
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GenCollectedHeap::SO_None, |
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ClassUnloading, // only strong roots if ClassUnloading |
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// is enabled |
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&follow_root_closure, |
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&follow_cld_closure); |
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} |
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// Process reference objects found during marking |
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{ |
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GCTraceTime(Debug, gc, phases) tm_m("Reference Processing", gc_timer()); |
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ref_processor()->setup_policy(clear_all_softrefs); |
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ReferenceProcessorPhaseTimes pt(_gc_timer, ref_processor()->max_num_queues()); |
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const ReferenceProcessorStats& stats = |
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ref_processor()->process_discovered_references( |
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&is_alive, &keep_alive, &follow_stack_closure, NULL, &pt); |
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pt.print_all_references(); |
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gc_tracer()->report_gc_reference_stats(stats); |
1 | 217 |
} |
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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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{ |
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GCTraceTime(Debug, gc, phases) tm_m("Weak Processing", gc_timer()); |
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WeakProcessor::weak_oops_do(&is_alive, &do_nothing_cl); |
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} |
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|
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{ |
37146 | 228 |
GCTraceTime(Debug, gc, phases) tm_m("Class Unloading", gc_timer()); |
1 | 229 |
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// Unload classes and purge the SystemDictionary. |
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bool purged_class = SystemDictionary::do_unloading(gc_timer()); |
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232 |
|
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// Unload nmethods. |
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CodeCache::do_unloading(&is_alive, purged_class); |
1 | 235 |
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// Prune dead klasses from subklass/sibling/implementor lists. |
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Klass::clean_weak_klass_links(purged_class); |
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} |
3696 | 239 |
|
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{ |
37146 | 241 |
GCTraceTime(Debug, gc, phases) t("Scrub String Table", gc_timer()); |
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// Delete entries for dead interned strings. |
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StringTable::unlink(&is_alive); |
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} |
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|
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{ |
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GCTraceTime(Debug, gc, phases) t("Scrub Symbol Table", gc_timer()); |
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// Clean up unreferenced symbols in symbol table. |
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SymbolTable::unlink(); |
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} |
18025 | 251 |
|
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gc_tracer()->report_object_count_after_gc(&is_alive); |
|
1 | 253 |
} |
254 |
||
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||
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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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||
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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 | 262 |
// overwritten. This is fine since it is dead, but if the class has dead |
263 |
// instances we have to skip them, and in order to find their size we |
|
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// need the Klass*! |
1 | 265 |
// |
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// 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 |
|
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// tracking expects us to do so. See comment under phase4. |
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GenCollectedHeap* gch = GenCollectedHeap::heap(); |
|
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||
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GCTraceTime(Info, gc, phases) tm("Phase 2: Compute new object addresses", _gc_timer); |
1 | 273 |
|
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gch->prepare_for_compaction(); |
|
275 |
} |
|
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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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}; |
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void GenMarkSweep::mark_sweep_phase3() { |
1 | 285 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
286 |
||
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// Adjust the pointers to reflect the new locations |
|
37146 | 288 |
GCTraceTime(Info, gc, phases) tm("Phase 3: Adjust pointers", gc_timer()); |
1 | 289 |
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// Need new claim bits for the pointer adjustment tracing. |
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ClassLoaderDataGraph::clear_claimed_marks(); |
1 | 292 |
|
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// Because the closure below is created statically, we cannot |
1 | 294 |
// use OopsInGenClosure constructor which takes a generation, |
295 |
// as the Universe has not been created when the static constructors |
|
296 |
// are run. |
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adjust_pointer_closure.set_orig_generation(gch->old_gen()); |
1 | 298 |
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{ |
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StrongRootsScope srs(1); |
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301 |
|
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gch->full_process_roots(&srs, |
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true, // this is the adjust phase |
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GenCollectedHeap::SO_AllCodeCache, |
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false, // all roots |
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&adjust_pointer_closure, |
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&adjust_cld_closure); |
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} |
1 | 309 |
|
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gch->gen_process_weak_roots(&adjust_pointer_closure); |
1 | 311 |
|
312 |
adjust_marks(); |
|
313 |
GenAdjustPointersClosure blk; |
|
314 |
gch->generation_iterate(&blk, true); |
|
315 |
} |
|
316 |
||
317 |
class GenCompactClosure: public GenCollectedHeap::GenClosure { |
|
318 |
public: |
|
319 |
void do_generation(Generation* gen) { |
|
320 |
gen->compact(); |
|
321 |
} |
|
322 |
}; |
|
323 |
||
324 |
void GenMarkSweep::mark_sweep_phase4() { |
|
325 |
// All pointers are now adjusted, move objects accordingly |
|
326 |
||
327 |
// It is imperative that we traverse perm_gen first in phase4. All |
|
328 |
// 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 |
1 | 330 |
// location before any instance does a dispatch through it's klass! |
331 |
||
332 |
// The ValidateMarkSweep live oops tracking expects us to traverse spaces |
|
333 |
// in the same order in phase2, phase3 and phase4. We don't quite do that |
|
334 |
// here (perm_gen first rather than last), so we tell the validate code |
|
335 |
// to use a higher index (saved from phase2) when verifying perm_gen. |
|
336 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
|
337 |
||
37146 | 338 |
GCTraceTime(Info, gc, phases) tm("Phase 4: Move objects", _gc_timer); |
1 | 339 |
|
340 |
GenCompactClosure blk; |
|
341 |
gch->generation_iterate(&blk, true); |
|
342 |
} |