duke@435: /*
iveresov@3536:  * Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #include "precompiled.hpp"
stefank@2314: #include "classfile/systemDictionary.hpp"
stefank@2314: #include "code/codeCache.hpp"
stefank@2314: #include "gc_implementation/parallelScavenge/cardTableExtension.hpp"
stefank@2314: #include "gc_implementation/parallelScavenge/gcTaskManager.hpp"
stefank@2314: #include "gc_implementation/parallelScavenge/psMarkSweep.hpp"
stefank@2314: #include "gc_implementation/parallelScavenge/psPromotionManager.hpp"
stefank@2314: #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp"
jcoomes@2661: #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
stefank@2314: #include "gc_implementation/parallelScavenge/psTasks.hpp"
stefank@2314: #include "memory/iterator.hpp"
stefank@2314: #include "memory/universe.hpp"
stefank@2314: #include "oops/oop.inline.hpp"
stefank@2314: #include "oops/oop.psgc.inline.hpp"
stefank@2314: #include "runtime/fprofiler.hpp"
stefank@2314: #include "runtime/thread.hpp"
stefank@2314: #include "runtime/vmThread.hpp"
stefank@2314: #include "services/management.hpp"
stefank@2314: #include "utilities/taskqueue.hpp"
duke@435: 
duke@435: //
duke@435: // ScavengeRootsTask
duke@435: //
duke@435: 
duke@435: void ScavengeRootsTask::do_it(GCTaskManager* manager, uint which) {
duke@435:   assert(Universe::heap()->is_gc_active(), "called outside gc");
duke@435: 
duke@435:   PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
duke@435:   PSScavengeRootsClosure roots_closure(pm);
iveresov@3536:   PSPromoteRootsClosure  roots_to_old_closure(pm);
duke@435: 
duke@435:   switch (_root_type) {
duke@435:     case universe:
duke@435:       Universe::oops_do(&roots_closure);
duke@435:       break;
duke@435: 
duke@435:     case jni_handles:
duke@435:       JNIHandles::oops_do(&roots_closure);
duke@435:       break;
duke@435: 
duke@435:     case threads:
duke@435:     {
duke@435:       ResourceMark rm;
stefank@4298:       CLDToOopClosure* cld_closure = NULL; // Not needed. All CLDs are already visited.
stefank@4298:       Threads::oops_do(&roots_closure, cld_closure, NULL);
duke@435:     }
duke@435:     break;
duke@435: 
duke@435:     case object_synchronizer:
duke@435:       ObjectSynchronizer::oops_do(&roots_closure);
duke@435:       break;
duke@435: 
duke@435:     case flat_profiler:
duke@435:       FlatProfiler::oops_do(&roots_closure);
duke@435:       break;
duke@435: 
duke@435:     case system_dictionary:
duke@435:       SystemDictionary::oops_do(&roots_closure);
stefank@5194:       break;
coleenp@4037: 
stefank@5194:     case class_loader_data:
stefank@5194:     {
stefank@5194:       PSScavengeKlassClosure klass_closure(pm);
stefank@5194:       ClassLoaderDataGraph::oops_do(&roots_closure, &klass_closure, false);
stefank@5194:     }
stefank@5194:     break;
duke@435: 
duke@435:     case management:
duke@435:       Management::oops_do(&roots_closure);
duke@435:       break;
duke@435: 
duke@435:     case jvmti:
duke@435:       JvmtiExport::oops_do(&roots_closure);
duke@435:       break;
duke@435: 
jrose@1424: 
jrose@1424:     case code_cache:
jrose@1424:       {
iveresov@3536:         CodeBlobToOopClosure each_scavengable_code_blob(&roots_to_old_closure, /*do_marking=*/ true);
jrose@1424:         CodeCache::scavenge_root_nmethods_do(&each_scavengable_code_blob);
jrose@1424:       }
jrose@1424:       break;
jrose@1424: 
duke@435:     default:
duke@435:       fatal("Unknown root type");
duke@435:   }
duke@435: 
duke@435:   // Do the real work
duke@435:   pm->drain_stacks(false);
duke@435: }
duke@435: 
duke@435: //
duke@435: // ThreadRootsTask
duke@435: //
duke@435: 
duke@435: void ThreadRootsTask::do_it(GCTaskManager* manager, uint which) {
duke@435:   assert(Universe::heap()->is_gc_active(), "called outside gc");
duke@435: 
duke@435:   PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
duke@435:   PSScavengeRootsClosure roots_closure(pm);
stefank@4298:   CLDToOopClosure* roots_from_clds = NULL;  // Not needed. All CLDs are already visited.
jrose@1424:   CodeBlobToOopClosure roots_in_blobs(&roots_closure, /*do_marking=*/ true);
duke@435: 
duke@435:   if (_java_thread != NULL)
stefank@4298:     _java_thread->oops_do(&roots_closure, roots_from_clds, &roots_in_blobs);
duke@435: 
duke@435:   if (_vm_thread != NULL)
stefank@4298:     _vm_thread->oops_do(&roots_closure, roots_from_clds, &roots_in_blobs);
duke@435: 
duke@435:   // Do the real work
duke@435:   pm->drain_stacks(false);
duke@435: }
duke@435: 
duke@435: //
duke@435: // StealTask
duke@435: //
duke@435: 
duke@435: StealTask::StealTask(ParallelTaskTerminator* t) :
duke@435:   _terminator(t) {}
duke@435: 
duke@435: void StealTask::do_it(GCTaskManager* manager, uint which) {
duke@435:   assert(Universe::heap()->is_gc_active(), "called outside gc");
duke@435: 
duke@435:   PSPromotionManager* pm =
duke@435:     PSPromotionManager::gc_thread_promotion_manager(which);
duke@435:   pm->drain_stacks(true);
duke@435:   guarantee(pm->stacks_empty(),
duke@435:             "stacks should be empty at this point");
duke@435: 
duke@435:   int random_seed = 17;
tonyp@2061:   while(true) {
tonyp@2061:     StarTask p;
tonyp@2061:     if (PSPromotionManager::steal_depth(which, &random_seed, p)) {
tonyp@2061:       TASKQUEUE_STATS_ONLY(pm->record_steal(p));
tonyp@2061:       pm->process_popped_location_depth(p);
tonyp@2061:       pm->drain_stacks_depth(true);
tonyp@2061:     } else {
tonyp@2061:       if (terminator()->offer_termination()) {
tonyp@2061:         break;
duke@435:       }
duke@435:     }
duke@435:   }
coleenp@548:   guarantee(pm->stacks_empty(), "stacks should be empty at this point");
duke@435: }
duke@435: 
duke@435: //
duke@435: // OldToYoungRootsTask
duke@435: //
duke@435: 
duke@435: void OldToYoungRootsTask::do_it(GCTaskManager* manager, uint which) {
jmasa@4128:   // There are not old-to-young pointers if the old gen is empty.
jmasa@4128:   assert(!_gen->object_space()->is_empty(),
jmasa@4128:     "Should not be called is there is no work");
duke@435:   assert(_gen != NULL, "Sanity");
duke@435:   assert(_gen->object_space()->contains(_gen_top) || _gen_top == _gen->object_space()->top(), "Sanity");
duke@435:   assert(_stripe_number < ParallelGCThreads, "Sanity");
duke@435: 
duke@435:   {
duke@435:     PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
duke@435: 
duke@435:     assert(Universe::heap()->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
duke@435:     CardTableExtension* card_table = (CardTableExtension *)Universe::heap()->barrier_set();
duke@435:     // FIX ME! Assert that card_table is the type we believe it to be.
duke@435: 
duke@435:     card_table->scavenge_contents_parallel(_gen->start_array(),
duke@435:                                            _gen->object_space(),
duke@435:                                            _gen_top,
duke@435:                                            pm,
jmasa@3294:                                            _stripe_number,
jmasa@3294:                                            _stripe_total);
duke@435: 
duke@435:     // Do the real work
duke@435:     pm->drain_stacks(false);
duke@435:   }
duke@435: }