--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/gc/parallel/pcTasks.cpp Wed May 13 15:16:06 2015 +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; 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");
+
+ 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);
+ }
+}