jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/parallelScavenge/pcTasks.cpp@c2bf0120ee5d (annotated)

src/share/vm/gc_implementation/parallelScavenge/pcTasks.cpp@c2bf0120ee5d (annotated)

src/share/vm/gc_implementation/parallelScavenge/pcTasks.cpp

Thu, 01 Sep 2011 16:18:17 +0200

author: stefank
date: Thu, 01 Sep 2011 16:18:17 +0200
changeset 3115: c2bf0120ee5d
parent 2708: 1d1603768966
child 3294: bca17e38de00
permissions: -rw-r--r--

7085906: Replace the permgen allocated sentinelRef with a self-looped end
Summary: Remove the sentinelRef and let the last Reference in a discovered chain point back to itself.
Reviewed-by: ysr, jmasa

 /*
  * Copyright (c) 2005, 2011, 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/pcTasks.hpp"
 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp"
 #include "gc_interface/collectedHeap.hpp"
 #include "memory/universe.hpp"
 #include "oops/objArrayKlass.inline.hpp"
 #include "oops/oop.inline.hpp"
 #include "oops/oop.pcgc.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"
 //
 // ThreadRootsMarkingTask
 //
 void ThreadRootsMarkingTask::do_it(GCTaskManager* manager, uint which) {
   assert(Universe::heap()->is_gc_active(), "called outside gc");
   ResourceMark rm;
   NOT_PRODUCT(TraceTime tm("ThreadRootsMarkingTask",
     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
   ParCompactionManager* cm =
     ParCompactionManager::gc_thread_compaction_manager(which);
   PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
   CodeBlobToOopClosure mark_and_push_in_blobs(&mark_and_push_closure, /*do_marking=*/ true);
   if (_java_thread != NULL)
     _java_thread->oops_do(&mark_and_push_closure, &mark_and_push_in_blobs);
   if (_vm_thread != NULL)
     _vm_thread->oops_do(&mark_and_push_closure, &mark_and_push_in_blobs);
   // Do the real work
   cm->follow_marking_stacks();
 }
 void MarkFromRootsTask::do_it(GCTaskManager* manager, uint which) {
   assert(Universe::heap()->is_gc_active(), "called outside gc");
   NOT_PRODUCT(TraceTime tm("MarkFromRootsTask",
     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
   ParCompactionManager* cm =
     ParCompactionManager::gc_thread_compaction_manager(which);
   PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
   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;
       CodeBlobToOopClosure each_active_code_blob(&mark_and_push_closure, /*do_marking=*/ true);
       Threads::oops_do(&mark_and_push_closure, &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 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(Universe::heap()->is_gc_active(), "called outside gc");
   NOT_PRODUCT(TraceTime tm("RefProcTask",
     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
   ParCompactionManager* cm =
     ParCompactionManager::gc_thread_compaction_manager(which);
   PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
   PSParallelCompact::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 = PSParallelCompact::gc_heap();
   uint parallel_gc_threads = heap->gc_task_manager()->workers();
   RegionTaskQueueSet* qset = ParCompactionManager::region_array();
   ParallelTaskTerminator terminator(parallel_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<parallel_gc_threads; j++) {
         q->enqueue(new StealMarkingTask(&terminator));
       }
     }
   }
   PSParallelCompact::gc_task_manager()->execute_and_wait(q);
 }
 void RefProcTaskExecutor::execute(EnqueueTask& task)
 {
   ParallelScavengeHeap* heap = PSParallelCompact::gc_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(Universe::heap()->is_gc_active(), "called outside gc");
   NOT_PRODUCT(TraceTime tm("StealMarkingTask",
     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
   ParCompactionManager* cm =
     ParCompactionManager::gc_thread_compaction_manager(which);
   PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
   oop obj = NULL;
   ObjArrayTask task;
   int random_seed = 17;
   do {
     while (ParCompactionManager::steal_objarray(which, &random_seed, task)) {
       objArrayKlass* const k = (objArrayKlass*)task.obj()->blueprint();
       k->oop_follow_contents(cm, task.obj(), task.index());
       cm->follow_marking_stacks();
     }
     while (ParCompactionManager::steal(which, &random_seed, obj)) {
       obj->follow_contents(cm);
       cm->follow_marking_stacks();
     }
   } while (!terminator()->offer_termination());
 }
 //
 // StealRegionCompactionTask
 //
 StealRegionCompactionTask::StealRegionCompactionTask(ParallelTaskTerminator* t):
   _terminator(t) {}
 void StealRegionCompactionTask::do_it(GCTaskManager* manager, uint which) {
   assert(Universe::heap()->is_gc_active(), "called outside gc");
   NOT_PRODUCT(TraceTime tm("StealRegionCompactionTask",
     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
   ParCompactionManager* cm =
     ParCompactionManager::gc_thread_compaction_manager(which);
   // 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(TraceTime tm("UpdateDensePrefixTask",
     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
   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(Universe::heap()->is_gc_active(), "called outside gc");
   NOT_PRODUCT(TraceTime tm("DrainStacksCompactionTask",
     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
   ParCompactionManager* cm =
     ParCompactionManager::gc_thread_compaction_manager(which);
   // Process any regions already in the compaction managers stacks.
   cm->drain_region_stacks();
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/parallelScavenge/pcTasks.cpp@c2bf0120ee5d (annotated)

src/share/vm/gc_implementation/parallelScavenge/pcTasks.cpp