jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/parallelScavenge/pcTasks.cpp@eda078b01c65

8015268: NPG: 2.5% regression in young GC times on CRM Sales Opty
Summary: Split SystemDictionary and ClassLoaderDataGraph root processing to help load balancing.
Reviewed-by: tschatzl, johnc

     1 /*

     2  * Copyright (c) 2005, 2013, 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);

    56   PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);

    57   CLDToOopClosure mark_and_push_from_clds(&mark_and_push_closure, true);

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

    60   if (_java_thread != NULL)

    61     _java_thread->oops_do(

    62         &mark_and_push_closure,

    63         &mark_and_push_from_clds,

    64         &mark_and_push_in_blobs);

    66   if (_vm_thread != NULL)

    67     _vm_thread->oops_do(

    68         &mark_and_push_closure,

    69         &mark_and_push_from_clds,

    70         &mark_and_push_in_blobs);

    72   // Do the real work

    73   cm->follow_marking_stacks();

    74 }

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

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

    80   NOT_PRODUCT(TraceTime tm("MarkFromRootsTask",

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

    82   ParCompactionManager* cm =

    83     ParCompactionManager::gc_thread_compaction_manager(which);

    84   PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);

    85   PSParallelCompact::FollowKlassClosure follow_klass_closure(&mark_and_push_closure);

    87   switch (_root_type) {

    88     case universe:

    89       Universe::oops_do(&mark_and_push_closure);

    90       break;

    92     case jni_handles:

    93       JNIHandles::oops_do(&mark_and_push_closure);

    94       break;

    96     case threads:

    97     {

    98       ResourceMark rm;

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

   100       CLDToOopClosure mark_and_push_from_cld(&mark_and_push_closure);

   101       Threads::oops_do(&mark_and_push_closure, &mark_and_push_from_cld, &each_active_code_blob);

   102     }

   103     break;

   105     case object_synchronizer:

   106       ObjectSynchronizer::oops_do(&mark_and_push_closure);

   107       break;

   109     case flat_profiler:

   110       FlatProfiler::oops_do(&mark_and_push_closure);

   111       break;

   113     case management:

   114       Management::oops_do(&mark_and_push_closure);

   115       break;

   117     case jvmti:

   118       JvmtiExport::oops_do(&mark_and_push_closure);

   119       break;

   121     case system_dictionary:

   122       SystemDictionary::always_strong_oops_do(&mark_and_push_closure);

   123       break;

   125     case class_loader_data:

   126       ClassLoaderDataGraph::always_strong_oops_do(&mark_and_push_closure, &follow_klass_closure, true);

   127       break;

   129     case code_cache:

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

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

   132       break;

   134     default:

   135       fatal("Unknown root type");

   136   }

   138   // Do the real work

   139   cm->follow_marking_stacks();

   140 }

   143 //

   144 // RefProcTaskProxy

   145 //

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

   148 {

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

   151   NOT_PRODUCT(TraceTime tm("RefProcTask",

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

   153   ParCompactionManager* cm =

   154     ParCompactionManager::gc_thread_compaction_manager(which);

   155   PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);

   156   PSParallelCompact::FollowStackClosure follow_stack_closure(cm);

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

   158                 mark_and_push_closure, follow_stack_closure);

   159 }

   161 //

   162 // RefProcTaskExecutor

   163 //

   165 void RefProcTaskExecutor::execute(ProcessTask& task)

   166 {

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

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

   169   uint active_gc_threads = heap->gc_task_manager()->active_workers();

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

   171   ParallelTaskTerminator terminator(active_gc_threads, qset);

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

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

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

   175   }

   176   if (task.marks_oops_alive()) {

   177     if (parallel_gc_threads>1) {

   178       for (uint j=0; j<active_gc_threads; j++) {

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

   180       }

   181     }

   182   }

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

   184 }

   186 void RefProcTaskExecutor::execute(EnqueueTask& task)

   187 {

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

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

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

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

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

   193   }

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

   195 }

   197 //

   198 // StealMarkingTask

   199 //

   201 StealMarkingTask::StealMarkingTask(ParallelTaskTerminator* t) :

   202   _terminator(t) {}

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

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

   207   NOT_PRODUCT(TraceTime tm("StealMarkingTask",

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

   210   ParCompactionManager* cm =

   211     ParCompactionManager::gc_thread_compaction_manager(which);

   212   PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);

   214   oop obj = NULL;

   215   ObjArrayTask task;

   216   int random_seed = 17;

   217   do {

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

   219       ObjArrayKlass* k = (ObjArrayKlass*)task.obj()->klass();

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

   221       cm->follow_marking_stacks();

   222     }

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

   224       obj->follow_contents(cm);

   225       cm->follow_marking_stacks();

   226     }

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

   228 }

   230 //

   231 // StealRegionCompactionTask

   232 //

   234 StealRegionCompactionTask::StealRegionCompactionTask(ParallelTaskTerminator* t):

   235   _terminator(t) {}

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

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

   240   NOT_PRODUCT(TraceTime tm("StealRegionCompactionTask",

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

   243   ParCompactionManager* cm =

   244     ParCompactionManager::gc_thread_compaction_manager(which);

   247   // If not all threads are active, get a draining stack

   248   // from the list.  Else, just use this threads draining stack.

   249   uint which_stack_index;

   250   bool use_all_workers = manager->all_workers_active();

   251   if (use_all_workers) {

   252     which_stack_index = which;

   253     assert(manager->active_workers() == ParallelGCThreads,

   254            err_msg("all_workers_active has been incorrectly set: "

   255                    " active %d  ParallelGCThreads %d", manager->active_workers(),

   256                    ParallelGCThreads));

   257   } else {

   258     which_stack_index = ParCompactionManager::pop_recycled_stack_index();

   259   }

   261   cm->set_region_stack_index(which_stack_index);

   262   cm->set_region_stack(ParCompactionManager::region_list(which_stack_index));

   263   if (TraceDynamicGCThreads) {

   264     gclog_or_tty->print_cr("StealRegionCompactionTask::do_it "

   265                            "region_stack_index %d region_stack = 0x%x "

   266                            " empty (%d) use all workers %d",

   267     which_stack_index, ParCompactionManager::region_list(which_stack_index),

   268     cm->region_stack()->is_empty(),

   269     use_all_workers);

   270   }

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

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

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

   276   cm->drain_region_stacks();

   278   size_t region_index = 0;

   279   int random_seed = 17;

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

   282   // setting the termination flag

   284   while(true) {

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

   286       PSParallelCompact::fill_and_update_region(cm, region_index);

   287       cm->drain_region_stacks();

   288     } else {

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

   290         break;

   291       }

   292       // Go around again.

   293     }

   294   }

   295   return;

   296 }

   298 UpdateDensePrefixTask::UpdateDensePrefixTask(

   299                                    PSParallelCompact::SpaceId space_id,

   300                                    size_t region_index_start,

   301                                    size_t region_index_end) :

   302   _space_id(space_id), _region_index_start(region_index_start),

   303   _region_index_end(region_index_end) {}

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

   307   NOT_PRODUCT(TraceTime tm("UpdateDensePrefixTask",

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

   310   ParCompactionManager* cm =

   311     ParCompactionManager::gc_thread_compaction_manager(which);

   313   PSParallelCompact::update_and_deadwood_in_dense_prefix(cm,

   314                                                          _space_id,

   315                                                          _region_index_start,

   316                                                          _region_index_end);

   317 }

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

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

   322   NOT_PRODUCT(TraceTime tm("DrainStacksCompactionTask",

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

   325   ParCompactionManager* cm =

   326     ParCompactionManager::gc_thread_compaction_manager(which);

   328   uint which_stack_index;

   329   bool use_all_workers = manager->all_workers_active();

   330   if (use_all_workers) {

   331     which_stack_index = which;

   332     assert(manager->active_workers() == ParallelGCThreads,

   333            err_msg("all_workers_active has been incorrectly set: "

   334                    " active %d  ParallelGCThreads %d", manager->active_workers(),

   335                    ParallelGCThreads));

   336   } else {

   337     which_stack_index = stack_index();

   338   }

   340   cm->set_region_stack(ParCompactionManager::region_list(which_stack_index));

   341   if (TraceDynamicGCThreads) {

   342     gclog_or_tty->print_cr("DrainStacksCompactionTask::do_it which = %d "

   343                            "which_stack_index = %d/empty(%d) "

   344                            "use all workers %d",

   345                            which, which_stack_index,

   346                            cm->region_stack()->is_empty(),

   347                            use_all_workers);

   348   }

   350   cm->set_region_stack_index(which_stack_index);

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

   353   cm->drain_region_stacks();

   355   assert(cm->region_stack()->is_empty(), "Not empty");

   357   if (!use_all_workers) {

   358     // Always give up the region stack.

   359     assert(cm->region_stack() ==

   360            ParCompactionManager::region_list(cm->region_stack_index()),

   361            "region_stack and region_stack_index are inconsistent");

   362     ParCompactionManager::push_recycled_stack_index(cm->region_stack_index());

   364     if (TraceDynamicGCThreads) {

   365       void* old_region_stack = (void*) cm->region_stack();

   366       int old_region_stack_index = cm->region_stack_index();

   367       gclog_or_tty->print_cr("Pushing region stack 0x%x/%d",

   368         old_region_stack, old_region_stack_index);

   369     }

   371     cm->set_region_stack(NULL);

   372     cm->set_region_stack_index((uint)max_uintx);

   373   }

   374 }

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

src/share/vm/gc_implementation/parallelScavenge/pcTasks.cpp@eda078b01c65

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