jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/parallelScavenge/psTasks.cpp@4dfb2df418f2 (annotated)

src/share/vm/gc_implementation/parallelScavenge/psTasks.cpp@4dfb2df418f2 (annotated)

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

Thu, 22 Sep 2011 10:57:37 -0700

author: johnc
date: Thu, 22 Sep 2011 10:57:37 -0700
changeset 3175: 4dfb2df418f2
parent 3115: c2bf0120ee5d
child 3294: bca17e38de00
permissions: -rw-r--r--

6484982: G1: process references during evacuation pauses
Summary: G1 now uses two reference processors - one is used by concurrent marking and the other is used by STW GCs (both full and incremental evacuation pauses). In an evacuation pause, the reference processor is embedded into the closures used to scan objects. Doing so causes causes reference objects to be 'discovered' by the reference processor. At the end of the evacuation pause, these discovered reference objects are processed - preserving (and copying) referent objects (and their reachable graphs) as appropriate.
Reviewed-by: ysr, jwilhelm, brutisso, stefank, tonyp

 /*
  * Copyright (c) 2002, 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
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 #include "precompiled.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "code/codeCache.hpp"
 #include "gc_implementation/parallelScavenge/cardTableExtension.hpp"
 #include "gc_implementation/parallelScavenge/gcTaskManager.hpp"
 #include "gc_implementation/parallelScavenge/psMarkSweep.hpp"
 #include "gc_implementation/parallelScavenge/psPromotionManager.hpp"
 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp"
 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
 #include "gc_implementation/parallelScavenge/psTasks.hpp"
 #include "memory/iterator.hpp"
 #include "memory/universe.hpp"
 #include "oops/oop.inline.hpp"
 #include "oops/oop.psgc.inline.hpp"
 #include "runtime/fprofiler.hpp"
 #include "runtime/thread.hpp"
 #include "runtime/vmThread.hpp"
 #include "services/management.hpp"
 #include "utilities/taskqueue.hpp"
 //
 // ScavengeRootsTask
 //
 void ScavengeRootsTask::do_it(GCTaskManager* manager, uint which) {
   assert(Universe::heap()->is_gc_active(), "called outside gc");
   PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
   PSScavengeRootsClosure roots_closure(pm);
   switch (_root_type) {
     case universe:
       Universe::oops_do(&roots_closure);
       break;
     case jni_handles:
       JNIHandles::oops_do(&roots_closure);
       break;
     case threads:
     {
       ResourceMark rm;
       Threads::oops_do(&roots_closure, NULL);
     }
     break;
     case object_synchronizer:
       ObjectSynchronizer::oops_do(&roots_closure);
       break;
     case flat_profiler:
       FlatProfiler::oops_do(&roots_closure);
       break;
     case system_dictionary:
       SystemDictionary::oops_do(&roots_closure);
       break;
     case management:
       Management::oops_do(&roots_closure);
       break;
     case jvmti:
       JvmtiExport::oops_do(&roots_closure);
       break;
     case code_cache:
       {
         CodeBlobToOopClosure each_scavengable_code_blob(&roots_closure, /*do_marking=*/ true);
         CodeCache::scavenge_root_nmethods_do(&each_scavengable_code_blob);
       }
       break;
     default:
       fatal("Unknown root type");
   }
   // Do the real work
   pm->drain_stacks(false);
 }
 //
 // ThreadRootsTask
 //
 void ThreadRootsTask::do_it(GCTaskManager* manager, uint which) {
   assert(Universe::heap()->is_gc_active(), "called outside gc");
   PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
   PSScavengeRootsClosure roots_closure(pm);
   CodeBlobToOopClosure roots_in_blobs(&roots_closure, /*do_marking=*/ true);
   if (_java_thread != NULL)
     _java_thread->oops_do(&roots_closure, &roots_in_blobs);
   if (_vm_thread != NULL)
     _vm_thread->oops_do(&roots_closure, &roots_in_blobs);
   // Do the real work
   pm->drain_stacks(false);
 }
 //
 // StealTask
 //
 StealTask::StealTask(ParallelTaskTerminator* t) :
   _terminator(t) {}
 void StealTask::do_it(GCTaskManager* manager, uint which) {
   assert(Universe::heap()->is_gc_active(), "called outside gc");
   PSPromotionManager* pm =
     PSPromotionManager::gc_thread_promotion_manager(which);
   pm->drain_stacks(true);
   guarantee(pm->stacks_empty(),
             "stacks should be empty at this point");
   int random_seed = 17;
   while(true) {
     StarTask p;
     if (PSPromotionManager::steal_depth(which, &random_seed, p)) {
       TASKQUEUE_STATS_ONLY(pm->record_steal(p));
       pm->process_popped_location_depth(p);
       pm->drain_stacks_depth(true);
     } else {
       if (terminator()->offer_termination()) {
         break;
       }
     }
   }
   guarantee(pm->stacks_empty(), "stacks should be empty at this point");
 }
 //
 // SerialOldToYoungRootsTask
 //
 void SerialOldToYoungRootsTask::do_it(GCTaskManager* manager, uint which) {
   assert(_gen != NULL, "Sanity");
   assert(_gen->object_space()->contains(_gen_top) || _gen_top == _gen->object_space()->top(), "Sanity");
   {
     PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
     assert(Universe::heap()->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
     CardTableExtension* card_table = (CardTableExtension *)Universe::heap()->barrier_set();
     // FIX ME! Assert that card_table is the type we believe it to be.
     card_table->scavenge_contents(_gen->start_array(),
                                   _gen->object_space(),
                                   _gen_top,
                                   pm);
     // Do the real work
     pm->drain_stacks(false);
   }
 }
 //
 // OldToYoungRootsTask
 //
 void OldToYoungRootsTask::do_it(GCTaskManager* manager, uint which) {
   assert(_gen != NULL, "Sanity");
   assert(_gen->object_space()->contains(_gen_top) || _gen_top == _gen->object_space()->top(), "Sanity");
   assert(_stripe_number < ParallelGCThreads, "Sanity");
   {
     PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
     assert(Universe::heap()->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
     CardTableExtension* card_table = (CardTableExtension *)Universe::heap()->barrier_set();
     // FIX ME! Assert that card_table is the type we believe it to be.
     card_table->scavenge_contents_parallel(_gen->start_array(),
                                            _gen->object_space(),
                                            _gen_top,
                                            pm,
                                            _stripe_number);
     // Do the real work
     pm->drain_stacks(false);
   }
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/parallelScavenge/psTasks.cpp@4dfb2df418f2 (annotated)

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