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 /*

  * Copyright (c) 2005, 2011, 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_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"

 //

 // ThreadRootsMarkingTask

 //

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

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

   ResourceMark rm;

   NOT_PRODUCT(TraceTime tm("ThreadRootsMarkingTask",

     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));

   ParCompactionManager* cm =

     ParCompactionManager::gc_thread_compaction_manager(which);

   PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);

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

   if (_java_thread != NULL)

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

   if (_vm_thread != NULL)

     _vm_thread->oops_do(&mark_and_push_closure, &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(TraceTime tm("MarkFromRootsTask",

     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));

   ParCompactionManager* cm =

     ParCompactionManager::gc_thread_compaction_manager(which);

   PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);

   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;

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

       Threads::oops_do(&mark_and_push_closure, &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 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(TraceTime tm("RefProcTask",

     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));

   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(TraceTime tm("StealMarkingTask",

     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));

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

       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(TraceTime tm("StealRegionCompactionTask",

     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));

   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(TraceTime tm("UpdateDensePrefixTask",

     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));

   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(TraceTime tm("DrainStacksCompactionTask",

     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));

   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);

   }

 }