jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/parallelScavenge/pcTasks.cpp@2c6ef90f030a (annotated)

src/share/vm/gc_implementation/parallelScavenge/pcTasks.cpp@2c6ef90f030a (annotated)

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

Mon, 07 Jul 2014 10:12:40 +0200

author: stefank
date: Mon, 07 Jul 2014 10:12:40 +0200
changeset 6992: 2c6ef90f030a
parent 6904: 0982ec23da03
child 7535: 7ae4e26cb1e0
child 8618: 90faa4a4b09f
permissions: -rw-r--r--

8049421: G1 Class Unloading after completing a concurrent mark cycle
Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov
Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com

 /*
  * Copyright (c) 2005, 2014, 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_implementation/shared/gcTimer.hpp"
 #include "gc_implementation/shared/gcTraceTime.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"
 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
 //
 // ThreadRootsMarkingTask
 //
 void ThreadRootsMarkingTask::do_it(GCTaskManager* manager, uint which) {
   assert(Universe::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);
   PSParallelCompact::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(Universe::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);
   PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
   PSParallelCompact::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(Universe::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);
   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();
   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 = 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(GCTraceTime tm("StealMarkingTask",
     PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id()));
   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* k = (ObjArrayKlass*)task.obj()->klass();
       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(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 %d", 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 = 0x%x "
                            " empty (%d) use all workers %d",
     which_stack_index, 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(Universe::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 %d", 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 0x%x/%d",
         old_region_stack, old_region_stack_index);
     }
     cm->set_region_stack(NULL);
     cm->set_region_stack_index((uint)max_uintx);
   }
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/parallelScavenge/pcTasks.cpp@2c6ef90f030a (annotated)

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