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

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

     1 /*

     2  * Copyright (c) 2005, 2014, 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_implementation/shared/gcTimer.hpp"

    31 #include "gc_implementation/shared/gcTraceTime.hpp"

    32 #include "gc_interface/collectedHeap.hpp"

    33 #include "memory/universe.hpp"

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

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

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

    37 #include "prims/jvmtiExport.hpp"

    38 #include "runtime/fprofiler.hpp"

    39 #include "runtime/jniHandles.hpp"

    40 #include "runtime/thread.hpp"

    41 #include "runtime/vmThread.hpp"

    42 #include "services/management.hpp"

    44 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC

    46 //

    47 // ThreadRootsMarkingTask

    48 //

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

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

    53   ResourceMark rm;

    55   NOT_PRODUCT(GCTraceTime tm("ThreadRootsMarkingTask",

    56     PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id()));

    57   ParCompactionManager* cm =

    58     ParCompactionManager::gc_thread_compaction_manager(which);

    60   PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);

    61   CLDToOopClosure mark_and_push_from_clds(&mark_and_push_closure, true);

    62   MarkingCodeBlobClosure mark_and_push_in_blobs(&mark_and_push_closure, !CodeBlobToOopClosure::FixRelocations);

    64   if (_java_thread != NULL)

    65     _java_thread->oops_do(

    66         &mark_and_push_closure,

    67         &mark_and_push_from_clds,

    68         &mark_and_push_in_blobs);

    70   if (_vm_thread != NULL)

    71     _vm_thread->oops_do(

    72         &mark_and_push_closure,

    73         &mark_and_push_from_clds,

    74         &mark_and_push_in_blobs);

    76   // Do the real work

    77   cm->follow_marking_stacks();

    78 }

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

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

    84   NOT_PRODUCT(GCTraceTime tm("MarkFromRootsTask",

    85     PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id()));

    86   ParCompactionManager* cm =

    87     ParCompactionManager::gc_thread_compaction_manager(which);

    88   PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);

    89   PSParallelCompact::FollowKlassClosure follow_klass_closure(&mark_and_push_closure);

    91   switch (_root_type) {

    92     case universe:

    93       Universe::oops_do(&mark_and_push_closure);

    94       break;

    96     case jni_handles:

    97       JNIHandles::oops_do(&mark_and_push_closure);

    98       break;

   100     case threads:

   101     {

   102       ResourceMark rm;

   103       MarkingCodeBlobClosure each_active_code_blob(&mark_and_push_closure, !CodeBlobToOopClosure::FixRelocations);

   104       CLDToOopClosure mark_and_push_from_cld(&mark_and_push_closure);

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

   106     }

   107     break;

   109     case object_synchronizer:

   110       ObjectSynchronizer::oops_do(&mark_and_push_closure);

   111       break;

   113     case flat_profiler:

   114       FlatProfiler::oops_do(&mark_and_push_closure);

   115       break;

   117     case management:

   118       Management::oops_do(&mark_and_push_closure);

   119       break;

   121     case jvmti:

   122       JvmtiExport::oops_do(&mark_and_push_closure);

   123       break;

   125     case system_dictionary:

   126       SystemDictionary::always_strong_oops_do(&mark_and_push_closure);

   127       break;

   129     case class_loader_data:

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

   131       break;

   133     case code_cache:

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

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

   136       break;

   138     default:

   139       fatal("Unknown root type");

   140   }

   142   // Do the real work

   143   cm->follow_marking_stacks();

   144 }

   147 //

   148 // RefProcTaskProxy

   149 //

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

   152 {

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

   155   NOT_PRODUCT(GCTraceTime tm("RefProcTask",

   156     PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id()));

   157   ParCompactionManager* cm =

   158     ParCompactionManager::gc_thread_compaction_manager(which);

   159   PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);

   160   PSParallelCompact::FollowStackClosure follow_stack_closure(cm);

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

   162                 mark_and_push_closure, follow_stack_closure);

   163 }

   165 //

   166 // RefProcTaskExecutor

   167 //

   169 void RefProcTaskExecutor::execute(ProcessTask& task)

   170 {

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

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

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

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

   175   ParallelTaskTerminator terminator(active_gc_threads, qset);

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

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

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

   179   }

   180   if (task.marks_oops_alive()) {

   181     if (parallel_gc_threads>1) {

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

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

   184       }

   185     }

   186   }

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

   188 }

   190 void RefProcTaskExecutor::execute(EnqueueTask& task)

   191 {

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

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

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

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

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

   197   }

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

   199 }

   201 //

   202 // StealMarkingTask

   203 //

   205 StealMarkingTask::StealMarkingTask(ParallelTaskTerminator* t) :

   206   _terminator(t) {}

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

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

   211   NOT_PRODUCT(GCTraceTime tm("StealMarkingTask",

   212     PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id()));

   214   ParCompactionManager* cm =

   215     ParCompactionManager::gc_thread_compaction_manager(which);

   216   PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);

   218   oop obj = NULL;

   219   ObjArrayTask task;

   220   int random_seed = 17;

   221   do {

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

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

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

   225       cm->follow_marking_stacks();

   226     }

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

   228       obj->follow_contents(cm);

   229       cm->follow_marking_stacks();

   230     }

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

   232 }

   234 //

   235 // StealRegionCompactionTask

   236 //

   238 StealRegionCompactionTask::StealRegionCompactionTask(ParallelTaskTerminator* t):

   239   _terminator(t) {}

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

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

   244   NOT_PRODUCT(GCTraceTime tm("StealRegionCompactionTask",

   245     PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id()));

   247   ParCompactionManager* cm =

   248     ParCompactionManager::gc_thread_compaction_manager(which);

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

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

   253   uint which_stack_index;

   254   bool use_all_workers = manager->all_workers_active();

   255   if (use_all_workers) {

   256     which_stack_index = which;

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

   258            err_msg("all_workers_active has been incorrectly set: "

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

   260                    ParallelGCThreads));

   261   } else {

   262     which_stack_index = ParCompactionManager::pop_recycled_stack_index();

   263   }

   265   cm->set_region_stack_index(which_stack_index);

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

   267   if (TraceDynamicGCThreads) {

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

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

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

   271     which_stack_index, ParCompactionManager::region_list(which_stack_index),

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

   273     use_all_workers);

   274   }

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

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

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

   280   cm->drain_region_stacks();

   282   size_t region_index = 0;

   283   int random_seed = 17;

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

   286   // setting the termination flag

   288   while(true) {

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

   290       PSParallelCompact::fill_and_update_region(cm, region_index);

   291       cm->drain_region_stacks();

   292     } else {

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

   294         break;

   295       }

   296       // Go around again.

   297     }

   298   }

   299   return;

   300 }

   302 UpdateDensePrefixTask::UpdateDensePrefixTask(

   303                                    PSParallelCompact::SpaceId space_id,

   304                                    size_t region_index_start,

   305                                    size_t region_index_end) :

   306   _space_id(space_id), _region_index_start(region_index_start),

   307   _region_index_end(region_index_end) {}

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

   311   NOT_PRODUCT(GCTraceTime tm("UpdateDensePrefixTask",

   312     PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id()));

   314   ParCompactionManager* cm =

   315     ParCompactionManager::gc_thread_compaction_manager(which);

   317   PSParallelCompact::update_and_deadwood_in_dense_prefix(cm,

   318                                                          _space_id,

   319                                                          _region_index_start,

   320                                                          _region_index_end);

   321 }

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

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

   326   NOT_PRODUCT(GCTraceTime tm("DrainStacksCompactionTask",

   327     PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id()));

   329   ParCompactionManager* cm =

   330     ParCompactionManager::gc_thread_compaction_manager(which);

   332   uint which_stack_index;

   333   bool use_all_workers = manager->all_workers_active();

   334   if (use_all_workers) {

   335     which_stack_index = which;

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

   337            err_msg("all_workers_active has been incorrectly set: "

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

   339                    ParallelGCThreads));

   340   } else {

   341     which_stack_index = stack_index();

   342   }

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

   345   if (TraceDynamicGCThreads) {

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

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

   348                            "use all workers %d",

   349                            which, which_stack_index,

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

   351                            use_all_workers);

   352   }

   354   cm->set_region_stack_index(which_stack_index);

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

   357   cm->drain_region_stacks();

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

   361   if (!use_all_workers) {

   362     // Always give up the region stack.

   363     assert(cm->region_stack() ==

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

   365            "region_stack and region_stack_index are inconsistent");

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

   368     if (TraceDynamicGCThreads) {

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

   370       int old_region_stack_index = cm->region_stack_index();

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

   372         old_region_stack, old_region_stack_index);

   373     }

   375     cm->set_region_stack(NULL);

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

   377   }

   378 }

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

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

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