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

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

     1 /*

     2  * Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 #include "precompiled.hpp"

    26 #include "classfile/systemDictionary.hpp"

    27 #include "code/codeCache.hpp"

    28 #include "gc_implementation/parallelScavenge/pcTasks.hpp"

    29 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp"

    30 #include "gc_interface/collectedHeap.hpp"

    31 #include "memory/universe.hpp"

    32 #include "oops/objArrayKlass.inline.hpp"

    33 #include "oops/oop.inline.hpp"

    34 #include "oops/oop.pcgc.inline.hpp"

    35 #include "prims/jvmtiExport.hpp"

    36 #include "runtime/fprofiler.hpp"

    37 #include "runtime/jniHandles.hpp"

    38 #include "runtime/thread.hpp"

    39 #include "runtime/vmThread.hpp"

    40 #include "services/management.hpp"

    42 //

    43 // ThreadRootsMarkingTask

    44 //

    46 void ThreadRootsMarkingTask::do_it(GCTaskManager* manager, uint which) {

    47   assert(Universe::heap()->is_gc_active(), "called outside gc");

    49   ResourceMark rm;

    51   NOT_PRODUCT(TraceTime tm("ThreadRootsMarkingTask",

    52     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));

    53   ParCompactionManager* cm =

    54     ParCompactionManager::gc_thread_compaction_manager(which);

    55   PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);

    56   CodeBlobToOopClosure mark_and_push_in_blobs(&mark_and_push_closure, /*do_marking=*/ true);

    58   if (_java_thread != NULL)

    59     _java_thread->oops_do(&mark_and_push_closure, &mark_and_push_in_blobs);

    61   if (_vm_thread != NULL)

    62     _vm_thread->oops_do(&mark_and_push_closure, &mark_and_push_in_blobs);

    64   // Do the real work

    65   cm->follow_marking_stacks();

    66 }

    69 void MarkFromRootsTask::do_it(GCTaskManager* manager, uint which) {

    70   assert(Universe::heap()->is_gc_active(), "called outside gc");

    72   NOT_PRODUCT(TraceTime tm("MarkFromRootsTask",

    73     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));

    74   ParCompactionManager* cm =

    75     ParCompactionManager::gc_thread_compaction_manager(which);

    76   PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);

    78   switch (_root_type) {

    79     case universe:

    80       Universe::oops_do(&mark_and_push_closure);

    81       break;

    83     case jni_handles:

    84       JNIHandles::oops_do(&mark_and_push_closure);

    85       break;

    87     case threads:

    88     {

    89       ResourceMark rm;

    90       CodeBlobToOopClosure each_active_code_blob(&mark_and_push_closure, /*do_marking=*/ true);

    91       Threads::oops_do(&mark_and_push_closure, &each_active_code_blob);

    92     }

    93     break;

    95     case object_synchronizer:

    96       ObjectSynchronizer::oops_do(&mark_and_push_closure);

    97       break;

    99     case flat_profiler:

   100       FlatProfiler::oops_do(&mark_and_push_closure);

   101       break;

   103     case management:

   104       Management::oops_do(&mark_and_push_closure);

   105       break;

   107     case jvmti:

   108       JvmtiExport::oops_do(&mark_and_push_closure);

   109       break;

   111     case system_dictionary:

   112       SystemDictionary::always_strong_oops_do(&mark_and_push_closure);

   113       break;

   115     case code_cache:

   116       // Do not treat nmethods as strong roots for mark/sweep, since we can unload them.

   117       //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(&mark_and_push_closure));

   118       break;

   120     default:

   121       fatal("Unknown root type");

   122   }

   124   // Do the real work

   125   cm->follow_marking_stacks();

   126 }

   129 //

   130 // RefProcTaskProxy

   131 //

   133 void RefProcTaskProxy::do_it(GCTaskManager* manager, uint which)

   134 {

   135   assert(Universe::heap()->is_gc_active(), "called outside gc");

   137   NOT_PRODUCT(TraceTime tm("RefProcTask",

   138     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));

   139   ParCompactionManager* cm =

   140     ParCompactionManager::gc_thread_compaction_manager(which);

   141   PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);

   142   PSParallelCompact::FollowStackClosure follow_stack_closure(cm);

   143   _rp_task.work(_work_id, *PSParallelCompact::is_alive_closure(),

   144                 mark_and_push_closure, follow_stack_closure);

   145 }

   147 //

   148 // RefProcTaskExecutor

   149 //

   151 void RefProcTaskExecutor::execute(ProcessTask& task)

   152 {

   153   ParallelScavengeHeap* heap = PSParallelCompact::gc_heap();

   154   uint parallel_gc_threads = heap->gc_task_manager()->workers();

   155   RegionTaskQueueSet* qset = ParCompactionManager::region_array();

   156   ParallelTaskTerminator terminator(parallel_gc_threads, qset);

   157   GCTaskQueue* q = GCTaskQueue::create();

   158   for(uint i=0; i<parallel_gc_threads; i++) {

   159     q->enqueue(new RefProcTaskProxy(task, i));

   160   }

   161   if (task.marks_oops_alive()) {

   162     if (parallel_gc_threads>1) {

   163       for (uint j=0; j<parallel_gc_threads; j++) {

   164         q->enqueue(new StealMarkingTask(&terminator));

   165       }

   166     }

   167   }

   168   PSParallelCompact::gc_task_manager()->execute_and_wait(q);

   169 }

   171 void RefProcTaskExecutor::execute(EnqueueTask& task)

   172 {

   173   ParallelScavengeHeap* heap = PSParallelCompact::gc_heap();

   174   uint parallel_gc_threads = heap->gc_task_manager()->workers();

   175   GCTaskQueue* q = GCTaskQueue::create();

   176   for(uint i=0; i<parallel_gc_threads; i++) {

   177     q->enqueue(new RefEnqueueTaskProxy(task, i));

   178   }

   179   PSParallelCompact::gc_task_manager()->execute_and_wait(q);

   180 }

   182 //

   183 // StealMarkingTask

   184 //

   186 StealMarkingTask::StealMarkingTask(ParallelTaskTerminator* t) :

   187   _terminator(t) {}

   189 void StealMarkingTask::do_it(GCTaskManager* manager, uint which) {

   190   assert(Universe::heap()->is_gc_active(), "called outside gc");

   192   NOT_PRODUCT(TraceTime tm("StealMarkingTask",

   193     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));

   195   ParCompactionManager* cm =

   196     ParCompactionManager::gc_thread_compaction_manager(which);

   197   PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);

   199   oop obj = NULL;

   200   ObjArrayTask task;

   201   int random_seed = 17;

   202   do {

   203     while (ParCompactionManager::steal_objarray(which, &random_seed, task)) {

   204       objArrayKlass* const k = (objArrayKlass*)task.obj()->blueprint();

   205       k->oop_follow_contents(cm, task.obj(), task.index());

   206       cm->follow_marking_stacks();

   207     }

   208     while (ParCompactionManager::steal(which, &random_seed, obj)) {

   209       obj->follow_contents(cm);

   210       cm->follow_marking_stacks();

   211     }

   212   } while (!terminator()->offer_termination());

   213 }

   215 //

   216 // StealRegionCompactionTask

   217 //

   220 StealRegionCompactionTask::StealRegionCompactionTask(ParallelTaskTerminator* t):

   221   _terminator(t) {}

   223 void StealRegionCompactionTask::do_it(GCTaskManager* manager, uint which) {

   224   assert(Universe::heap()->is_gc_active(), "called outside gc");

   226   NOT_PRODUCT(TraceTime tm("StealRegionCompactionTask",

   227     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));

   229   ParCompactionManager* cm =

   230     ParCompactionManager::gc_thread_compaction_manager(which);

   232   // Has to drain stacks first because there may be regions on

   233   // preloaded onto the stack and this thread may never have

   234   // done a draining task.  Are the draining tasks needed?

   236   cm->drain_region_stacks();

   238   size_t region_index = 0;

   239   int random_seed = 17;

   241   // If we're the termination task, try 10 rounds of stealing before

   242   // setting the termination flag

   244   while(true) {

   245     if (ParCompactionManager::steal(which, &random_seed, region_index)) {

   246       PSParallelCompact::fill_and_update_region(cm, region_index);

   247       cm->drain_region_stacks();

   248     } else {

   249       if (terminator()->offer_termination()) {

   250         break;

   251       }

   252       // Go around again.

   253     }

   254   }

   255   return;

   256 }

   258 UpdateDensePrefixTask::UpdateDensePrefixTask(

   259                                    PSParallelCompact::SpaceId space_id,

   260                                    size_t region_index_start,

   261                                    size_t region_index_end) :

   262   _space_id(space_id), _region_index_start(region_index_start),

   263   _region_index_end(region_index_end) {}

   265 void UpdateDensePrefixTask::do_it(GCTaskManager* manager, uint which) {

   267   NOT_PRODUCT(TraceTime tm("UpdateDensePrefixTask",

   268     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));

   270   ParCompactionManager* cm =

   271     ParCompactionManager::gc_thread_compaction_manager(which);

   273   PSParallelCompact::update_and_deadwood_in_dense_prefix(cm,

   274                                                          _space_id,

   275                                                          _region_index_start,

   276                                                          _region_index_end);

   277 }

   279 void DrainStacksCompactionTask::do_it(GCTaskManager* manager, uint which) {

   280   assert(Universe::heap()->is_gc_active(), "called outside gc");

   282   NOT_PRODUCT(TraceTime tm("DrainStacksCompactionTask",

   283     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));

   285   ParCompactionManager* cm =

   286     ParCompactionManager::gc_thread_compaction_manager(which);

   288   // Process any regions already in the compaction managers stacks.

   289   cm->drain_region_stacks();

   290 }

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

src/share/vm/gc_implementation/parallelScavenge/pcTasks.cpp@c2bf0120ee5d

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