author | rkennke |
Thu, 12 Oct 2017 15:08:19 +0200 | |
changeset 47622 | 817f2a7019e4 |
child 47636 | 52d46d7e3454 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2017, 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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|
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#include "precompiled.hpp" |
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#include "gc/cms/concurrentMarkSweepThread.hpp" |
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#include "gc/cms/cmsHeap.hpp" |
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#include "gc/cms/vmCMSOperations.hpp" |
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#include "gc/shared/genOopClosures.inline.hpp" |
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#include "gc/shared/strongRootsScope.hpp" |
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#include "gc/shared/workgroup.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/vmThread.hpp" |
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#include "utilities/stack.inline.hpp" |
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|
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CMSHeap::CMSHeap(GenCollectorPolicy *policy) : GenCollectedHeap(policy) { |
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_workers = new WorkGang("GC Thread", ParallelGCThreads, |
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/* are_GC_task_threads */true, |
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/* are_ConcurrentGC_threads */false); |
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_workers->initialize_workers(); |
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} |
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|
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jint CMSHeap::initialize() { |
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jint status = GenCollectedHeap::initialize(); |
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if (status != JNI_OK) return status; |
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|
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// If we are running CMS, create the collector responsible |
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// for collecting the CMS generations. |
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assert(collector_policy()->is_concurrent_mark_sweep_policy(), "must be CMS policy"); |
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create_cms_collector(); |
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|
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return JNI_OK; |
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} |
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void CMSHeap::check_gen_kinds() { |
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assert(young_gen()->kind() == Generation::ParNew, |
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"Wrong youngest generation type"); |
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assert(old_gen()->kind() == Generation::ConcurrentMarkSweep, |
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"Wrong generation kind"); |
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} |
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CMSHeap* CMSHeap::heap() { |
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CollectedHeap* heap = Universe::heap(); |
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assert(heap != NULL, "Uninitialized access to CMSHeap::heap()"); |
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assert(heap->kind() == CollectedHeap::CMSHeap, "Not a CMSHeap"); |
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return (CMSHeap*) heap; |
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} |
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void CMSHeap::gc_threads_do(ThreadClosure* tc) const { |
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assert(workers() != NULL, "should have workers here"); |
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workers()->threads_do(tc); |
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ConcurrentMarkSweepThread::threads_do(tc); |
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} |
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void CMSHeap::print_gc_threads_on(outputStream* st) const { |
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assert(workers() != NULL, "should have workers here"); |
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workers()->print_worker_threads_on(st); |
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ConcurrentMarkSweepThread::print_all_on(st); |
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} |
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void CMSHeap::print_on_error(outputStream* st) const { |
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GenCollectedHeap::print_on_error(st); |
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st->cr(); |
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CMSCollector::print_on_error(st); |
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} |
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void CMSHeap::create_cms_collector() { |
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assert(old_gen()->kind() == Generation::ConcurrentMarkSweep, |
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"Unexpected generation kinds"); |
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assert(gen_policy()->is_concurrent_mark_sweep_policy(), "Unexpected policy type"); |
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CMSCollector* collector = |
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new CMSCollector((ConcurrentMarkSweepGeneration*) old_gen(), |
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rem_set(), |
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gen_policy()->as_concurrent_mark_sweep_policy()); |
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if (!collector->completed_initialization()) { |
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vm_shutdown_during_initialization("Could not create CMS collector"); |
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} |
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} |
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void CMSHeap::collect(GCCause::Cause cause) { |
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if (should_do_concurrent_full_gc(cause)) { |
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// Mostly concurrent full collection. |
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collect_mostly_concurrent(cause); |
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} else { |
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GenCollectedHeap::collect(cause); |
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} |
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} |
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bool CMSHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { |
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switch (cause) { |
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case GCCause::_gc_locker: return GCLockerInvokesConcurrent; |
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case GCCause::_java_lang_system_gc: |
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case GCCause::_dcmd_gc_run: return ExplicitGCInvokesConcurrent; |
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default: return false; |
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} |
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} |
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void CMSHeap::collect_mostly_concurrent(GCCause::Cause cause) { |
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assert(!Heap_lock->owned_by_self(), "Should not own Heap_lock"); |
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MutexLocker ml(Heap_lock); |
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// Read the GC counts while holding the Heap_lock |
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unsigned int full_gc_count_before = total_full_collections(); |
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unsigned int gc_count_before = total_collections(); |
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{ |
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MutexUnlocker mu(Heap_lock); |
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VM_GenCollectFullConcurrent op(gc_count_before, full_gc_count_before, cause); |
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VMThread::execute(&op); |
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} |
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} |
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|
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void CMSHeap::stop() { |
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ConcurrentMarkSweepThread::cmst()->stop(); |
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} |
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|
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void CMSHeap::cms_process_roots(StrongRootsScope* scope, |
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bool young_gen_as_roots, |
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ScanningOption so, |
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bool only_strong_roots, |
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OopsInGenClosure* root_closure, |
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CLDClosure* cld_closure) { |
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MarkingCodeBlobClosure mark_code_closure(root_closure, !CodeBlobToOopClosure::FixRelocations); |
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OopsInGenClosure* weak_roots = only_strong_roots ? NULL : root_closure; |
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CLDClosure* weak_cld_closure = only_strong_roots ? NULL : cld_closure; |
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|
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process_roots(scope, so, root_closure, weak_roots, cld_closure, weak_cld_closure, &mark_code_closure); |
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if (!only_strong_roots) { |
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process_string_table_roots(scope, root_closure); |
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} |
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|
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if (young_gen_as_roots && |
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!_process_strong_tasks->is_task_claimed(GCH_PS_younger_gens)) { |
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root_closure->set_generation(young_gen()); |
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young_gen()->oop_iterate(root_closure); |
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root_closure->reset_generation(); |
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} |
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_process_strong_tasks->all_tasks_completed(scope->n_threads()); |
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} |
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|
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void CMSHeap::gc_prologue(bool full) { |
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always_do_update_barrier = false; |
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GenCollectedHeap::gc_prologue(full); |
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}; |
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void CMSHeap::gc_epilogue(bool full) { |
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GenCollectedHeap::gc_epilogue(full); |
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always_do_update_barrier = true; |
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}; |