Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 2002, 2010, 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 "incls/_precompiled.incl"

 #include "incls/_psTasks.cpp.incl"

 //

 // ScavengeRootsTask

 //

 // Define before use

 class PSScavengeRootsClosure: public OopClosure {

  private:

   PSPromotionManager* _promotion_manager;

  protected:

   template <class T> void do_oop_work(T *p) {

     if (PSScavenge::should_scavenge(p)) {

       // We never card mark roots, maybe call a func without test?

       PSScavenge::copy_and_push_safe_barrier(_promotion_manager, p);

     }

   }

  public:

   PSScavengeRootsClosure(PSPromotionManager* pm) : _promotion_manager(pm) { }

   void do_oop(oop* p)       { PSScavengeRootsClosure::do_oop_work(p); }

   void do_oop(narrowOop* p) { PSScavengeRootsClosure::do_oop_work(p); }

 };

 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);

       ReferenceProcessor::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);

   }

 }