--- old/src/share/vm/gc_implementation/parallelScavenge/pcTasks.cpp 2015-05-13 13:57:08.316842610 +0200 +++ /dev/null 2015-03-18 17:10:38.111854831 +0100 @@ -1,377 +0,0 @@ -/* - * Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved. - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. - * - * This code is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 only, as - * published by the Free Software Foundation. - * - * This code is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License - * version 2 for more details (a copy is included in the LICENSE file that - * accompanied this code). - * - * You should have received a copy of the GNU General Public License version - * 2 along with this work; if not, write to the Free Software Foundation, - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. - * - * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA - * or visit www.oracle.com if you need additional information or have any - * questions. - * - */ - -#include "precompiled.hpp" -#include "classfile/systemDictionary.hpp" -#include "code/codeCache.hpp" -#include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" -#include "gc_implementation/parallelScavenge/pcTasks.hpp" -#include "gc_implementation/parallelScavenge/psCompactionManager.inline.hpp" -#include "gc_implementation/parallelScavenge/psParallelCompact.hpp" -#include "gc_implementation/shared/gcTimer.hpp" -#include "gc_implementation/shared/gcTraceTime.hpp" -#include "gc_interface/collectedHeap.hpp" -#include "memory/universe.hpp" -#include "oops/objArrayKlass.inline.hpp" -#include "oops/oop.inline.hpp" -#include "prims/jvmtiExport.hpp" -#include "runtime/fprofiler.hpp" -#include "runtime/jniHandles.hpp" -#include "runtime/thread.hpp" -#include "runtime/vmThread.hpp" -#include "services/management.hpp" -#include "utilities/stack.inline.hpp" - -// -// ThreadRootsMarkingTask -// - -void ThreadRootsMarkingTask::do_it(GCTaskManager* manager, uint which) { - assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); - - ResourceMark rm; - - NOT_PRODUCT(GCTraceTime tm("ThreadRootsMarkingTask", - PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id())); - ParCompactionManager* cm = - ParCompactionManager::gc_thread_compaction_manager(which); - - ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm); - CLDToOopClosure mark_and_push_from_clds(&mark_and_push_closure, true); - MarkingCodeBlobClosure mark_and_push_in_blobs(&mark_and_push_closure, !CodeBlobToOopClosure::FixRelocations); - - if (_java_thread != NULL) - _java_thread->oops_do( - &mark_and_push_closure, - &mark_and_push_from_clds, - &mark_and_push_in_blobs); - - if (_vm_thread != NULL) - _vm_thread->oops_do( - &mark_and_push_closure, - &mark_and_push_from_clds, - &mark_and_push_in_blobs); - - // Do the real work - cm->follow_marking_stacks(); -} - - -void MarkFromRootsTask::do_it(GCTaskManager* manager, uint which) { - assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); - - NOT_PRODUCT(GCTraceTime tm("MarkFromRootsTask", - PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id())); - ParCompactionManager* cm = - ParCompactionManager::gc_thread_compaction_manager(which); - ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm); - ParCompactionManager::FollowKlassClosure follow_klass_closure(&mark_and_push_closure); - - switch (_root_type) { - case universe: - Universe::oops_do(&mark_and_push_closure); - break; - - case jni_handles: - JNIHandles::oops_do(&mark_and_push_closure); - break; - - case threads: - { - ResourceMark rm; - MarkingCodeBlobClosure each_active_code_blob(&mark_and_push_closure, !CodeBlobToOopClosure::FixRelocations); - CLDToOopClosure mark_and_push_from_cld(&mark_and_push_closure); - Threads::oops_do(&mark_and_push_closure, &mark_and_push_from_cld, &each_active_code_blob); - } - break; - - case object_synchronizer: - ObjectSynchronizer::oops_do(&mark_and_push_closure); - break; - - case flat_profiler: - FlatProfiler::oops_do(&mark_and_push_closure); - break; - - case management: - Management::oops_do(&mark_and_push_closure); - break; - - case jvmti: - JvmtiExport::oops_do(&mark_and_push_closure); - break; - - case system_dictionary: - SystemDictionary::always_strong_oops_do(&mark_and_push_closure); - break; - - case class_loader_data: - ClassLoaderDataGraph::always_strong_oops_do(&mark_and_push_closure, &follow_klass_closure, true); - break; - - case code_cache: - // Do not treat nmethods as strong roots for mark/sweep, since we can unload them. - //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(&mark_and_push_closure)); - break; - - default: - fatal("Unknown root type"); - } - - // Do the real work - cm->follow_marking_stacks(); -} - - -// -// RefProcTaskProxy -// - -void RefProcTaskProxy::do_it(GCTaskManager* manager, uint which) -{ - assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); - - NOT_PRODUCT(GCTraceTime tm("RefProcTask", - PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id())); - ParCompactionManager* cm = - ParCompactionManager::gc_thread_compaction_manager(which); - ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm); - ParCompactionManager::FollowStackClosure follow_stack_closure(cm); - _rp_task.work(_work_id, *PSParallelCompact::is_alive_closure(), - mark_and_push_closure, follow_stack_closure); -} - -// -// RefProcTaskExecutor -// - -void RefProcTaskExecutor::execute(ProcessTask& task) -{ - ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); - uint parallel_gc_threads = heap->gc_task_manager()->workers(); - uint active_gc_threads = heap->gc_task_manager()->active_workers(); - RegionTaskQueueSet* qset = ParCompactionManager::region_array(); - ParallelTaskTerminator terminator(active_gc_threads, qset); - GCTaskQueue* q = GCTaskQueue::create(); - for(uint i=0; ienqueue(new RefProcTaskProxy(task, i)); - } - if (task.marks_oops_alive()) { - if (parallel_gc_threads>1) { - for (uint j=0; jenqueue(new StealMarkingTask(&terminator)); - } - } - } - PSParallelCompact::gc_task_manager()->execute_and_wait(q); -} - -void RefProcTaskExecutor::execute(EnqueueTask& task) -{ - ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); - uint parallel_gc_threads = heap->gc_task_manager()->workers(); - GCTaskQueue* q = GCTaskQueue::create(); - for(uint i=0; ienqueue(new RefEnqueueTaskProxy(task, i)); - } - PSParallelCompact::gc_task_manager()->execute_and_wait(q); -} - -// -// StealMarkingTask -// - -StealMarkingTask::StealMarkingTask(ParallelTaskTerminator* t) : - _terminator(t) {} - -void StealMarkingTask::do_it(GCTaskManager* manager, uint which) { - assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); - - NOT_PRODUCT(GCTraceTime tm("StealMarkingTask", - PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id())); - - ParCompactionManager* cm = - ParCompactionManager::gc_thread_compaction_manager(which); - ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm); - - oop obj = NULL; - ObjArrayTask task; - int random_seed = 17; - do { - while (ParCompactionManager::steal_objarray(which, &random_seed, task)) { - cm->follow_contents((objArrayOop)task.obj(), task.index()); - cm->follow_marking_stacks(); - } - while (ParCompactionManager::steal(which, &random_seed, obj)) { - cm->follow_contents(obj); - cm->follow_marking_stacks(); - } - } while (!terminator()->offer_termination()); -} - -// -// StealRegionCompactionTask -// - -StealRegionCompactionTask::StealRegionCompactionTask(ParallelTaskTerminator* t): - _terminator(t) {} - -void StealRegionCompactionTask::do_it(GCTaskManager* manager, uint which) { - assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); - - NOT_PRODUCT(GCTraceTime tm("StealRegionCompactionTask", - PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id())); - - ParCompactionManager* cm = - ParCompactionManager::gc_thread_compaction_manager(which); - - - // If not all threads are active, get a draining stack - // from the list. Else, just use this threads draining stack. - uint which_stack_index; - bool use_all_workers = manager->all_workers_active(); - if (use_all_workers) { - which_stack_index = which; - assert(manager->active_workers() == ParallelGCThreads, - err_msg("all_workers_active has been incorrectly set: " - " active %d ParallelGCThreads " UINTX_FORMAT, manager->active_workers(), - ParallelGCThreads)); - } else { - which_stack_index = ParCompactionManager::pop_recycled_stack_index(); - } - - cm->set_region_stack_index(which_stack_index); - cm->set_region_stack(ParCompactionManager::region_list(which_stack_index)); - if (TraceDynamicGCThreads) { - gclog_or_tty->print_cr("StealRegionCompactionTask::do_it " - "region_stack_index %d region_stack = " PTR_FORMAT " " - " empty (%d) use all workers %d", - which_stack_index, p2i(ParCompactionManager::region_list(which_stack_index)), - cm->region_stack()->is_empty(), - use_all_workers); - } - - // Has to drain stacks first because there may be regions on - // preloaded onto the stack and this thread may never have - // done a draining task. Are the draining tasks needed? - - cm->drain_region_stacks(); - - size_t region_index = 0; - int random_seed = 17; - - // If we're the termination task, try 10 rounds of stealing before - // setting the termination flag - - while(true) { - if (ParCompactionManager::steal(which, &random_seed, region_index)) { - PSParallelCompact::fill_and_update_region(cm, region_index); - cm->drain_region_stacks(); - } else { - if (terminator()->offer_termination()) { - break; - } - // Go around again. - } - } - return; -} - -UpdateDensePrefixTask::UpdateDensePrefixTask( - PSParallelCompact::SpaceId space_id, - size_t region_index_start, - size_t region_index_end) : - _space_id(space_id), _region_index_start(region_index_start), - _region_index_end(region_index_end) {} - -void UpdateDensePrefixTask::do_it(GCTaskManager* manager, uint which) { - - NOT_PRODUCT(GCTraceTime tm("UpdateDensePrefixTask", - PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id())); - - ParCompactionManager* cm = - ParCompactionManager::gc_thread_compaction_manager(which); - - PSParallelCompact::update_and_deadwood_in_dense_prefix(cm, - _space_id, - _region_index_start, - _region_index_end); -} - -void DrainStacksCompactionTask::do_it(GCTaskManager* manager, uint which) { - assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); - - NOT_PRODUCT(GCTraceTime tm("DrainStacksCompactionTask", - PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id())); - - ParCompactionManager* cm = - ParCompactionManager::gc_thread_compaction_manager(which); - - uint which_stack_index; - bool use_all_workers = manager->all_workers_active(); - if (use_all_workers) { - which_stack_index = which; - assert(manager->active_workers() == ParallelGCThreads, - err_msg("all_workers_active has been incorrectly set: " - " active %d ParallelGCThreads " UINTX_FORMAT, manager->active_workers(), - ParallelGCThreads)); - } else { - which_stack_index = stack_index(); - } - - cm->set_region_stack(ParCompactionManager::region_list(which_stack_index)); - if (TraceDynamicGCThreads) { - gclog_or_tty->print_cr("DrainStacksCompactionTask::do_it which = %d " - "which_stack_index = %d/empty(%d) " - "use all workers %d", - which, which_stack_index, - cm->region_stack()->is_empty(), - use_all_workers); - } - - cm->set_region_stack_index(which_stack_index); - - // Process any regions already in the compaction managers stacks. - cm->drain_region_stacks(); - - assert(cm->region_stack()->is_empty(), "Not empty"); - - if (!use_all_workers) { - // Always give up the region stack. - assert(cm->region_stack() == - ParCompactionManager::region_list(cm->region_stack_index()), - "region_stack and region_stack_index are inconsistent"); - ParCompactionManager::push_recycled_stack_index(cm->region_stack_index()); - - if (TraceDynamicGCThreads) { - void* old_region_stack = (void*) cm->region_stack(); - int old_region_stack_index = cm->region_stack_index(); - gclog_or_tty->print_cr("Pushing region stack " PTR_FORMAT "/%d", - p2i(old_region_stack), old_region_stack_index); - } - - cm->set_region_stack(NULL); - cm->set_region_stack_index((uint)max_uintx); - } -} --- /dev/null 2015-03-18 17:10:38.111854831 +0100 +++ new/src/share/vm/gc/parallel/pcTasks.cpp 2015-05-13 13:57:08.091833273 +0200 @@ -0,0 +1,377 @@ +/* + * Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + * + */ + +#include "precompiled.hpp" +#include "classfile/systemDictionary.hpp" +#include "code/codeCache.hpp" +#include "gc/parallel/parallelScavengeHeap.hpp" +#include "gc/parallel/pcTasks.hpp" +#include "gc/parallel/psCompactionManager.inline.hpp" +#include "gc/parallel/psParallelCompact.hpp" +#include "gc/shared/collectedHeap.hpp" +#include "gc/shared/gcTimer.hpp" +#include "gc/shared/gcTraceTime.hpp" +#include "memory/universe.hpp" +#include "oops/objArrayKlass.inline.hpp" +#include "oops/oop.inline.hpp" +#include "prims/jvmtiExport.hpp" +#include "runtime/fprofiler.hpp" +#include "runtime/jniHandles.hpp" +#include "runtime/thread.hpp" +#include "runtime/vmThread.hpp" +#include "services/management.hpp" +#include "utilities/stack.inline.hpp" + +// +// ThreadRootsMarkingTask +// + +void ThreadRootsMarkingTask::do_it(GCTaskManager* manager, uint which) { + assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); + + ResourceMark rm; + + NOT_PRODUCT(GCTraceTime tm("ThreadRootsMarkingTask", + PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id())); + ParCompactionManager* cm = + ParCompactionManager::gc_thread_compaction_manager(which); + + ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm); + CLDToOopClosure mark_and_push_from_clds(&mark_and_push_closure, true); + MarkingCodeBlobClosure mark_and_push_in_blobs(&mark_and_push_closure, !CodeBlobToOopClosure::FixRelocations); + + if (_java_thread != NULL) + _java_thread->oops_do( + &mark_and_push_closure, + &mark_and_push_from_clds, + &mark_and_push_in_blobs); + + if (_vm_thread != NULL) + _vm_thread->oops_do( + &mark_and_push_closure, + &mark_and_push_from_clds, + &mark_and_push_in_blobs); + + // Do the real work + cm->follow_marking_stacks(); +} + + +void MarkFromRootsTask::do_it(GCTaskManager* manager, uint which) { + assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); + + NOT_PRODUCT(GCTraceTime tm("MarkFromRootsTask", + PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id())); + ParCompactionManager* cm = + ParCompactionManager::gc_thread_compaction_manager(which); + ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm); + ParCompactionManager::FollowKlassClosure follow_klass_closure(&mark_and_push_closure); + + switch (_root_type) { + case universe: + Universe::oops_do(&mark_and_push_closure); + break; + + case jni_handles: + JNIHandles::oops_do(&mark_and_push_closure); + break; + + case threads: + { + ResourceMark rm; + MarkingCodeBlobClosure each_active_code_blob(&mark_and_push_closure, !CodeBlobToOopClosure::FixRelocations); + CLDToOopClosure mark_and_push_from_cld(&mark_and_push_closure); + Threads::oops_do(&mark_and_push_closure, &mark_and_push_from_cld, &each_active_code_blob); + } + break; + + case object_synchronizer: + ObjectSynchronizer::oops_do(&mark_and_push_closure); + break; + + case flat_profiler: + FlatProfiler::oops_do(&mark_and_push_closure); + break; + + case management: + Management::oops_do(&mark_and_push_closure); + break; + + case jvmti: + JvmtiExport::oops_do(&mark_and_push_closure); + break; + + case system_dictionary: + SystemDictionary::always_strong_oops_do(&mark_and_push_closure); + break; + + case class_loader_data: + ClassLoaderDataGraph::always_strong_oops_do(&mark_and_push_closure, &follow_klass_closure, true); + break; + + case code_cache: + // Do not treat nmethods as strong roots for mark/sweep, since we can unload them. + //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(&mark_and_push_closure)); + break; + + default: + fatal("Unknown root type"); + } + + // Do the real work + cm->follow_marking_stacks(); +} + + +// +// RefProcTaskProxy +// + +void RefProcTaskProxy::do_it(GCTaskManager* manager, uint which) +{ + assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); + + NOT_PRODUCT(GCTraceTime tm("RefProcTask", + PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id())); + ParCompactionManager* cm = + ParCompactionManager::gc_thread_compaction_manager(which); + ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm); + ParCompactionManager::FollowStackClosure follow_stack_closure(cm); + _rp_task.work(_work_id, *PSParallelCompact::is_alive_closure(), + mark_and_push_closure, follow_stack_closure); +} + +// +// RefProcTaskExecutor +// + +void RefProcTaskExecutor::execute(ProcessTask& task) +{ + ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); + uint parallel_gc_threads = heap->gc_task_manager()->workers(); + uint active_gc_threads = heap->gc_task_manager()->active_workers(); + RegionTaskQueueSet* qset = ParCompactionManager::region_array(); + ParallelTaskTerminator terminator(active_gc_threads, qset); + GCTaskQueue* q = GCTaskQueue::create(); + for(uint i=0; ienqueue(new RefProcTaskProxy(task, i)); + } + if (task.marks_oops_alive()) { + if (parallel_gc_threads>1) { + for (uint j=0; jenqueue(new StealMarkingTask(&terminator)); + } + } + } + PSParallelCompact::gc_task_manager()->execute_and_wait(q); +} + +void RefProcTaskExecutor::execute(EnqueueTask& task) +{ + ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); + uint parallel_gc_threads = heap->gc_task_manager()->workers(); + GCTaskQueue* q = GCTaskQueue::create(); + for(uint i=0; ienqueue(new RefEnqueueTaskProxy(task, i)); + } + PSParallelCompact::gc_task_manager()->execute_and_wait(q); +} + +// +// StealMarkingTask +// + +StealMarkingTask::StealMarkingTask(ParallelTaskTerminator* t) : + _terminator(t) {} + +void StealMarkingTask::do_it(GCTaskManager* manager, uint which) { + assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); + + NOT_PRODUCT(GCTraceTime tm("StealMarkingTask", + PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id())); + + ParCompactionManager* cm = + ParCompactionManager::gc_thread_compaction_manager(which); + ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm); + + oop obj = NULL; + ObjArrayTask task; + int random_seed = 17; + do { + while (ParCompactionManager::steal_objarray(which, &random_seed, task)) { + cm->follow_contents((objArrayOop)task.obj(), task.index()); + cm->follow_marking_stacks(); + } + while (ParCompactionManager::steal(which, &random_seed, obj)) { + cm->follow_contents(obj); + cm->follow_marking_stacks(); + } + } while (!terminator()->offer_termination()); +} + +// +// StealRegionCompactionTask +// + +StealRegionCompactionTask::StealRegionCompactionTask(ParallelTaskTerminator* t): + _terminator(t) {} + +void StealRegionCompactionTask::do_it(GCTaskManager* manager, uint which) { + assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); + + NOT_PRODUCT(GCTraceTime tm("StealRegionCompactionTask", + PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id())); + + ParCompactionManager* cm = + ParCompactionManager::gc_thread_compaction_manager(which); + + + // If not all threads are active, get a draining stack + // from the list. Else, just use this threads draining stack. + uint which_stack_index; + bool use_all_workers = manager->all_workers_active(); + if (use_all_workers) { + which_stack_index = which; + assert(manager->active_workers() == ParallelGCThreads, + err_msg("all_workers_active has been incorrectly set: " + " active %d ParallelGCThreads " UINTX_FORMAT, manager->active_workers(), + ParallelGCThreads)); + } else { + which_stack_index = ParCompactionManager::pop_recycled_stack_index(); + } + + cm->set_region_stack_index(which_stack_index); + cm->set_region_stack(ParCompactionManager::region_list(which_stack_index)); + if (TraceDynamicGCThreads) { + gclog_or_tty->print_cr("StealRegionCompactionTask::do_it " + "region_stack_index %d region_stack = " PTR_FORMAT " " + " empty (%d) use all workers %d", + which_stack_index, p2i(ParCompactionManager::region_list(which_stack_index)), + cm->region_stack()->is_empty(), + use_all_workers); + } + + // Has to drain stacks first because there may be regions on + // preloaded onto the stack and this thread may never have + // done a draining task. Are the draining tasks needed? + + cm->drain_region_stacks(); + + size_t region_index = 0; + int random_seed = 17; + + // If we're the termination task, try 10 rounds of stealing before + // setting the termination flag + + while(true) { + if (ParCompactionManager::steal(which, &random_seed, region_index)) { + PSParallelCompact::fill_and_update_region(cm, region_index); + cm->drain_region_stacks(); + } else { + if (terminator()->offer_termination()) { + break; + } + // Go around again. + } + } + return; +} + +UpdateDensePrefixTask::UpdateDensePrefixTask( + PSParallelCompact::SpaceId space_id, + size_t region_index_start, + size_t region_index_end) : + _space_id(space_id), _region_index_start(region_index_start), + _region_index_end(region_index_end) {} + +void UpdateDensePrefixTask::do_it(GCTaskManager* manager, uint which) { + + NOT_PRODUCT(GCTraceTime tm("UpdateDensePrefixTask", + PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id())); + + ParCompactionManager* cm = + ParCompactionManager::gc_thread_compaction_manager(which); + + PSParallelCompact::update_and_deadwood_in_dense_prefix(cm, + _space_id, + _region_index_start, + _region_index_end); +} + +void DrainStacksCompactionTask::do_it(GCTaskManager* manager, uint which) { + assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); + + NOT_PRODUCT(GCTraceTime tm("DrainStacksCompactionTask", + PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id())); + + ParCompactionManager* cm = + ParCompactionManager::gc_thread_compaction_manager(which); + + uint which_stack_index; + bool use_all_workers = manager->all_workers_active(); + if (use_all_workers) { + which_stack_index = which; + assert(manager->active_workers() == ParallelGCThreads, + err_msg("all_workers_active has been incorrectly set: " + " active %d ParallelGCThreads " UINTX_FORMAT, manager->active_workers(), + ParallelGCThreads)); + } else { + which_stack_index = stack_index(); + } + + cm->set_region_stack(ParCompactionManager::region_list(which_stack_index)); + if (TraceDynamicGCThreads) { + gclog_or_tty->print_cr("DrainStacksCompactionTask::do_it which = %d " + "which_stack_index = %d/empty(%d) " + "use all workers %d", + which, which_stack_index, + cm->region_stack()->is_empty(), + use_all_workers); + } + + cm->set_region_stack_index(which_stack_index); + + // Process any regions already in the compaction managers stacks. + cm->drain_region_stacks(); + + assert(cm->region_stack()->is_empty(), "Not empty"); + + if (!use_all_workers) { + // Always give up the region stack. + assert(cm->region_stack() == + ParCompactionManager::region_list(cm->region_stack_index()), + "region_stack and region_stack_index are inconsistent"); + ParCompactionManager::push_recycled_stack_index(cm->region_stack_index()); + + if (TraceDynamicGCThreads) { + void* old_region_stack = (void*) cm->region_stack(); + int old_region_stack_index = cm->region_stack_index(); + gclog_or_tty->print_cr("Pushing region stack " PTR_FORMAT "/%d", + p2i(old_region_stack), old_region_stack_index); + } + + cm->set_region_stack(NULL); + cm->set_region_stack_index((uint)max_uintx); + } +}