| /* |
| * 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.inline.hpp" |
| #include "logging/log.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; |
| |
| 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"); |
| |
| 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"); |
| |
| 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; i<parallel_gc_threads; i++) { |
| q->enqueue(new RefProcTaskProxy(task, i)); |
| } |
| if (task.marks_oops_alive()) { |
| if (parallel_gc_threads>1) { |
| for (uint j=0; j<active_gc_threads; j++) { |
| q->enqueue(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; i<parallel_gc_threads; i++) { |
| q->enqueue(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"); |
| |
| 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"); |
| |
| 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, |
| "all_workers_active has been incorrectly set: " |
| " active %d ParallelGCThreads %u", 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)); |
| |
| // 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) { |
| |
| 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"); |
| |
| 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, |
| "all_workers_active has been incorrectly set: " |
| " active %d ParallelGCThreads %u", manager->active_workers(), |
| ParallelGCThreads); |
| } else { |
| which_stack_index = stack_index(); |
| } |
| |
| cm->set_region_stack(ParCompactionManager::region_list(which_stack_index)); |
| |
| 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()); |
| |
| cm->set_region_stack(NULL); |
| cm->set_region_stack_index((uint)max_uintx); |
| } |
| } |