6725697: par compact - rename class ChunkData to RegionData

Reviewed-by: iveresov, tonyp

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

@@ -146,7 +146,7 @@ void RefProcTaskExecutor::execute(ProcessTask& task)
 {
   ParallelScavengeHeap* heap = PSParallelCompact::gc_heap();
   uint parallel_gc_threads = heap->gc_task_manager()->workers();
-  ChunkTaskQueueSet* qset = ParCompactionManager::chunk_array();
+  RegionTaskQueueSet* qset = ParCompactionManager::region_array();
   ParallelTaskTerminator terminator(parallel_gc_threads, qset);
   GCTaskQueue* q = GCTaskQueue::create();
   for(uint i=0; i<parallel_gc_threads; i++) {
@@ -205,38 +205,38 @@ void StealMarkingTask::do_it(GCTaskManager* manager, uint which) {
 }
 
 //
-// StealChunkCompactionTask
+// StealRegionCompactionTask
 //
 
 
-StealChunkCompactionTask::StealChunkCompactionTask(ParallelTaskTerminator* t) :
-  _terminator(t) {};
+StealRegionCompactionTask::StealRegionCompactionTask(ParallelTaskTerminator* t):
+  _terminator(t) {}
 
-void StealChunkCompactionTask::do_it(GCTaskManager* manager, uint which) {
+void StealRegionCompactionTask::do_it(GCTaskManager* manager, uint which) {
   assert(Universe::heap()->is_gc_active(), "called outside gc");
 
-  NOT_PRODUCT(TraceTime tm("StealChunkCompactionTask",
+  NOT_PRODUCT(TraceTime tm("StealRegionCompactionTask",
     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
 
   ParCompactionManager* cm =
     ParCompactionManager::gc_thread_compaction_manager(which);
 
-  // Has to drain stacks first because there may be chunks on
+  // 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_chunk_stacks();
+  cm->drain_region_stacks();
 
-  size_t chunk_index = 0;
+  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, chunk_index)) {
-      PSParallelCompact::fill_and_update_chunk(cm, chunk_index);
-      cm->drain_chunk_stacks();
+    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;
@@ -249,11 +249,10 @@ void StealChunkCompactionTask::do_it(GCTaskManager* manager, uint which) {
 
 UpdateDensePrefixTask::UpdateDensePrefixTask(
                                    PSParallelCompact::SpaceId space_id,
-                                   size_t chunk_index_start,
-                                   size_t chunk_index_end) :
-  _space_id(space_id), _chunk_index_start(chunk_index_start),
-  _chunk_index_end(chunk_index_end)
-{}
+                                   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) {
 
@@ -265,8 +264,8 @@ void UpdateDensePrefixTask::do_it(GCTaskManager* manager, uint which) {
 
   PSParallelCompact::update_and_deadwood_in_dense_prefix(cm,
                                                          _space_id,
-                                                         _chunk_index_start,
-                                                         _chunk_index_end);
+                                                         _region_index_start,
+                                                         _region_index_end);
 }
 
 void DrainStacksCompactionTask::do_it(GCTaskManager* manager, uint which) {
@@ -278,6 +277,6 @@ void DrainStacksCompactionTask::do_it(GCTaskManager* manager, uint which) {
   ParCompactionManager* cm =
     ParCompactionManager::gc_thread_compaction_manager(which);
 
-  // Process any chunks already in the compaction managers stacks.
-  cm->drain_chunk_stacks();
+  // Process any regions already in the compaction managers stacks.
+  cm->drain_region_stacks();
 }

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

@@ -188,18 +188,18 @@ class StealMarkingTask : public GCTask {
 };
 
 //
-// StealChunkCompactionTask
+// StealRegionCompactionTask
 //
 // This task is used to distribute work to idle threads.
 //
 
-class StealChunkCompactionTask : public GCTask {
+class StealRegionCompactionTask : public GCTask {
  private:
    ParallelTaskTerminator* const _terminator;
  public:
-  StealChunkCompactionTask(ParallelTaskTerminator* t);
+  StealRegionCompactionTask(ParallelTaskTerminator* t);
 
-  char* name() { return (char *)"steal-chunk-task"; }
+  char* name() { return (char *)"steal-region-task"; }
   ParallelTaskTerminator* terminator() { return _terminator; }
 
   virtual void do_it(GCTaskManager* manager, uint which);
@@ -215,15 +215,15 @@ class StealChunkCompactionTask : public GCTask {
 class UpdateDensePrefixTask : public GCTask {
  private:
   PSParallelCompact::SpaceId _space_id;
-  size_t _chunk_index_start;
-  size_t _chunk_index_end;
+  size_t _region_index_start;
+  size_t _region_index_end;
 
  public:
   char* name() { return (char *)"update-dense_prefix-task"; }
 
   UpdateDensePrefixTask(PSParallelCompact::SpaceId space_id,
-                        size_t chunk_index_start,
-                        size_t chunk_index_end);
+                        size_t region_index_start,
+                        size_t region_index_end);
 
   virtual void do_it(GCTaskManager* manager, uint which);
 };
@@ -231,17 +231,17 @@ class UpdateDensePrefixTask : public GCTask {
 //
 // DrainStacksCompactionTask
 //
-// This task processes chunks that have been added to the stacks of each
+// This task processes regions that have been added to the stacks of each
 // compaction manager.
 //
 // Trying to use one draining thread does not work because there are no
 // guarantees about which task will be picked up by which thread.  For example,
-// if thread A gets all the preloaded chunks, thread A may not get a draining
+// if thread A gets all the preloaded regions, thread A may not get a draining
 // task (they may all be done by other threads).
 //
 
 class DrainStacksCompactionTask : public GCTask {
  public:
-  char* name() { return (char *)"drain-chunk-task"; }
+  char* name() { return (char *)"drain-region-task"; }
   virtual void do_it(GCTaskManager* manager, uint which);
 };

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

@@ -30,7 +30,7 @@ ParCompactionManager**  ParCompactionManager::_manager_array = NULL;
 OopTaskQueueSet*     ParCompactionManager::_stack_array = NULL;
 ObjectStartArray*    ParCompactionManager::_start_array = NULL;
 ParMarkBitMap*       ParCompactionManager::_mark_bitmap = NULL;
-ChunkTaskQueueSet*   ParCompactionManager::_chunk_array = NULL;
+RegionTaskQueueSet*   ParCompactionManager::_region_array = NULL;
 
 ParCompactionManager::ParCompactionManager() :
     _action(CopyAndUpdate) {
@@ -46,13 +46,13 @@ ParCompactionManager::ParCompactionManager() :
 
   // We want the overflow stack to be permanent
   _overflow_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(10, true);
-#ifdef USE_ChunkTaskQueueWithOverflow
-  chunk_stack()->initialize();
+#ifdef USE_RegionTaskQueueWithOverflow
+  region_stack()->initialize();
 #else
-  chunk_stack()->initialize();
+  region_stack()->initialize();
 
   // We want the overflow stack to be permanent
-  _chunk_overflow_stack =
+  _region_overflow_stack =
     new (ResourceObj::C_HEAP) GrowableArray<size_t>(10, true);
 #endif
 
@@ -86,18 +86,18 @@ void ParCompactionManager::initialize(ParMarkBitMap* mbm) {
 
   _stack_array = new OopTaskQueueSet(parallel_gc_threads);
   guarantee(_stack_array != NULL, "Count not initialize promotion manager");
-  _chunk_array = new ChunkTaskQueueSet(parallel_gc_threads);
-  guarantee(_chunk_array != NULL, "Count not initialize promotion manager");
+  _region_array = new RegionTaskQueueSet(parallel_gc_threads);
+  guarantee(_region_array != NULL, "Count not initialize promotion manager");
 
   // Create and register the ParCompactionManager(s) for the worker threads.
   for(uint i=0; i<parallel_gc_threads; i++) {
     _manager_array[i] = new ParCompactionManager();
     guarantee(_manager_array[i] != NULL, "Could not create ParCompactionManager");
     stack_array()->register_queue(i, _manager_array[i]->marking_stack());
-#ifdef USE_ChunkTaskQueueWithOverflow
-    chunk_array()->register_queue(i, _manager_array[i]->chunk_stack()->task_queue());
+#ifdef USE_RegionTaskQueueWithOverflow
+    region_array()->register_queue(i, _manager_array[i]->region_stack()->task_queue());
 #else
-    chunk_array()->register_queue(i, _manager_array[i]->chunk_stack());
+    region_array()->register_queue(i, _manager_array[i]->region_stack());
 #endif
   }
 
@@ -153,31 +153,31 @@ oop ParCompactionManager::retrieve_for_scanning() {
   return NULL;
 }
 
-// Save chunk on a stack
-void ParCompactionManager::save_for_processing(size_t chunk_index) {
+// Save region on a stack
+void ParCompactionManager::save_for_processing(size_t region_index) {
 #ifdef ASSERT
   const ParallelCompactData& sd = PSParallelCompact::summary_data();
-  ParallelCompactData::ChunkData* const chunk_ptr = sd.chunk(chunk_index);
-  assert(chunk_ptr->claimed(), "must be claimed");
-  assert(chunk_ptr->_pushed++ == 0, "should only be pushed once");
+  ParallelCompactData::RegionData* const region_ptr = sd.region(region_index);
+  assert(region_ptr->claimed(), "must be claimed");
+  assert(region_ptr->_pushed++ == 0, "should only be pushed once");
 #endif
-  chunk_stack_push(chunk_index);
+  region_stack_push(region_index);
 }
 
-void ParCompactionManager::chunk_stack_push(size_t chunk_index) {
+void ParCompactionManager::region_stack_push(size_t region_index) {
 
-#ifdef USE_ChunkTaskQueueWithOverflow
-  chunk_stack()->save(chunk_index);
+#ifdef USE_RegionTaskQueueWithOverflow
+  region_stack()->save(region_index);
 #else
-  if(!chunk_stack()->push(chunk_index)) {
-    chunk_overflow_stack()->push(chunk_index);
+  if(!region_stack()->push(region_index)) {
+    region_overflow_stack()->push(region_index);
   }
 #endif
 }
 
-bool ParCompactionManager::retrieve_for_processing(size_t& chunk_index) {
-#ifdef USE_ChunkTaskQueueWithOverflow
-  return chunk_stack()->retrieve(chunk_index);
+bool ParCompactionManager::retrieve_for_processing(size_t& region_index) {
+#ifdef USE_RegionTaskQueueWithOverflow
+  return region_stack()->retrieve(region_index);
 #else
   // Should not be used in the parallel case
   ShouldNotReachHere();
@@ -230,14 +230,14 @@ void ParCompactionManager::drain_marking_stacks(OopClosure* blk) {
   assert(overflow_stack()->length() == 0, "Sanity");
 }
 
-void ParCompactionManager::drain_chunk_overflow_stack() {
-  size_t chunk_index = (size_t) -1;
-  while(chunk_stack()->retrieve_from_overflow(chunk_index)) {
-    PSParallelCompact::fill_and_update_chunk(this, chunk_index);
+void ParCompactionManager::drain_region_overflow_stack() {
+  size_t region_index = (size_t) -1;
+  while(region_stack()->retrieve_from_overflow(region_index)) {
+    PSParallelCompact::fill_and_update_region(this, region_index);
   }
 }
 
-void ParCompactionManager::drain_chunk_stacks() {
+void ParCompactionManager::drain_region_stacks() {
 #ifdef ASSERT
   ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
   assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
@@ -249,42 +249,42 @@ void ParCompactionManager::drain_chunk_stacks() {
 #if 1 // def DO_PARALLEL - the serial code hasn't been updated
   do {
 
-#ifdef USE_ChunkTaskQueueWithOverflow
+#ifdef USE_RegionTaskQueueWithOverflow
     // Drain overflow stack first, so other threads can steal from
     // claimed stack while we work.
-    size_t chunk_index = (size_t) -1;
-    while(chunk_stack()->retrieve_from_overflow(chunk_index)) {
-      PSParallelCompact::fill_and_update_chunk(this, chunk_index);
+    size_t region_index = (size_t) -1;
+    while(region_stack()->retrieve_from_overflow(region_index)) {
+      PSParallelCompact::fill_and_update_region(this, region_index);
     }
 
-    while (chunk_stack()->retrieve_from_stealable_queue(chunk_index)) {
-      PSParallelCompact::fill_and_update_chunk(this, chunk_index);
+    while (region_stack()->retrieve_from_stealable_queue(region_index)) {
+      PSParallelCompact::fill_and_update_region(this, region_index);
     }
-  } while (!chunk_stack()->is_empty());
+  } while (!region_stack()->is_empty());
 #else
     // Drain overflow stack first, so other threads can steal from
     // claimed stack while we work.
-    while(!chunk_overflow_stack()->is_empty()) {
-      size_t chunk_index = chunk_overflow_stack()->pop();
-      PSParallelCompact::fill_and_update_chunk(this, chunk_index);
+    while(!region_overflow_stack()->is_empty()) {
+      size_t region_index = region_overflow_stack()->pop();
+      PSParallelCompact::fill_and_update_region(this, region_index);
     }
 
-    size_t chunk_index = -1;
+    size_t region_index = -1;
     // obj is a reference!!!
-    while (chunk_stack()->pop_local(chunk_index)) {
+    while (region_stack()->pop_local(region_index)) {
       // It would be nice to assert about the type of objects we might
       // pop, but they can come from anywhere, unfortunately.
-      PSParallelCompact::fill_and_update_chunk(this, chunk_index);
+      PSParallelCompact::fill_and_update_region(this, region_index);
     }
-  } while((chunk_stack()->size() != 0) ||
-          (chunk_overflow_stack()->length() != 0));
+  } while((region_stack()->size() != 0) ||
+          (region_overflow_stack()->length() != 0));
 #endif
 
-#ifdef USE_ChunkTaskQueueWithOverflow
-  assert(chunk_stack()->is_empty(), "Sanity");
+#ifdef USE_RegionTaskQueueWithOverflow
+  assert(region_stack()->is_empty(), "Sanity");
 #else
-  assert(chunk_stack()->size() == 0, "Sanity");
-  assert(chunk_overflow_stack()->length() == 0, "Sanity");
+  assert(region_stack()->size() == 0, "Sanity");
+  assert(region_overflow_stack()->length() == 0, "Sanity");
 #endif
 #else
   oop obj;

src/share/vm/gc_implementation/parallelScavenge/psCompactionManager.hpp

@@ -52,7 +52,7 @@ class ParCompactionManager : public CHeapObj {
   friend class ParallelTaskTerminator;
   friend class ParMarkBitMap;
   friend class PSParallelCompact;
-  friend class StealChunkCompactionTask;
+  friend class StealRegionCompactionTask;
   friend class UpdateAndFillClosure;
   friend class RefProcTaskExecutor;
 
@@ -75,20 +75,20 @@ class ParCompactionManager : public CHeapObj {
   static ParCompactionManager** _manager_array;
   static OopTaskQueueSet*       _stack_array;
   static ObjectStartArray*      _start_array;
-  static ChunkTaskQueueSet*    _chunk_array;
+  static RegionTaskQueueSet*    _region_array;
   static PSOldGen*              _old_gen;
 
   OopTaskQueue                  _marking_stack;
   GrowableArray<oop>*           _overflow_stack;
   // Is there a way to reuse the _marking_stack for the
-  // saving empty chunks?  For now just create a different
+  // saving empty regions?  For now just create a different
   // type of TaskQueue.
 
-#ifdef USE_ChunkTaskQueueWithOverflow
-  ChunkTaskQueueWithOverflow   _chunk_stack;
+#ifdef USE_RegionTaskQueueWithOverflow
+  RegionTaskQueueWithOverflow   _region_stack;
 #else
-  ChunkTaskQueue               _chunk_stack;
-  GrowableArray<size_t>*       _chunk_overflow_stack;
+  RegionTaskQueue               _region_stack;
+  GrowableArray<size_t>*        _region_overflow_stack;
 #endif
 
 #if 1  // does this happen enough to need a per thread stack?
@@ -106,15 +106,16 @@ class ParCompactionManager : public CHeapObj {
 
  protected:
   // Array of tasks.  Needed by the ParallelTaskTerminator.
-  static ChunkTaskQueueSet* chunk_array()   { return _chunk_array; }
-
+  static RegionTaskQueueSet* region_array()      { return _region_array; }
   OopTaskQueue*  marking_stack()                 { return &_marking_stack; }
   GrowableArray<oop>* overflow_stack()           { return _overflow_stack; }
-#ifdef USE_ChunkTaskQueueWithOverflow
-  ChunkTaskQueueWithOverflow* chunk_stack() { return &_chunk_stack; }
+#ifdef USE_RegionTaskQueueWithOverflow
+  RegionTaskQueueWithOverflow* region_stack()    { return &_region_stack; }
 #else
-  ChunkTaskQueue*  chunk_stack()          { return &_chunk_stack; }
-  GrowableArray<size_t>* chunk_overflow_stack() { return _chunk_overflow_stack; }
+  RegionTaskQueue*  region_stack()               { return &_region_stack; }
+  GrowableArray<size_t>* region_overflow_stack() {
+    return _region_overflow_stack;
+  }
 #endif
 
   // Pushes onto the marking stack.  If the marking stack is full,
@@ -123,9 +124,9 @@ class ParCompactionManager : public CHeapObj {
   // Do not implement an equivalent stack_pop.  Deal with the
   // marking stack and overflow stack directly.
 
-  // Pushes onto the chunk stack.  If the chunk stack is full,
-  // pushes onto the chunk overflow stack.
-  void chunk_stack_push(size_t chunk_index);
+  // Pushes onto the region stack.  If the region stack is full,
+  // pushes onto the region overflow stack.
+  void region_stack_push(size_t region_index);
  public:
 
   Action action() { return _action; }
@@ -160,10 +161,10 @@ class ParCompactionManager : public CHeapObj {
   // Get a oop for scanning.  If returns null, no oop were found.
   oop retrieve_for_scanning();
 
-  // Save chunk for later processing.  Must not fail.
-  void save_for_processing(size_t chunk_index);
-  // Get a chunk for processing.  If returns null, no chunk were found.
-  bool retrieve_for_processing(size_t& chunk_index);
+  // Save region for later processing.  Must not fail.
+  void save_for_processing(size_t region_index);
+  // Get a region for processing.  If returns null, no region were found.
+  bool retrieve_for_processing(size_t& region_index);
 
   // Access function for compaction managers
   static ParCompactionManager* gc_thread_compaction_manager(int index);
@@ -172,18 +173,18 @@ class ParCompactionManager : public CHeapObj {
     return stack_array()->steal(queue_num, seed, t);
   }
 
-  static bool steal(int queue_num, int* seed, ChunkTask& t) {
-    return chunk_array()->steal(queue_num, seed, t);
+  static bool steal(int queue_num, int* seed, RegionTask& t) {
+    return region_array()->steal(queue_num, seed, t);
   }
 
   // Process tasks remaining on any stack
   void drain_marking_stacks(OopClosure *blk);
 
   // Process tasks remaining on any stack
-  void drain_chunk_stacks();
+  void drain_region_stacks();
 
   // Process tasks remaining on any stack
-  void drain_chunk_overflow_stack();
+  void drain_region_overflow_stack();
 
   // Debugging support
 #ifdef ASSERT

src/share/vm/runtime/globals.hpp

@@ -1157,9 +1157,9 @@ class CommandLineFlags {
           "In the Parallel Old garbage collector use parallel dense"        \
           " prefix update")                                                 \
                                                                             \
-  develop(bool, UseParallelOldGCChunkPointerCalc, true,                     \
-          "In the Parallel Old garbage collector use chucks to calculate"   \
-          " new object locations")                                          \
+  develop(bool, UseParallelOldGCRegionPointerCalc, true,                    \
+          "In the Parallel Old garbage collector use regions to calculate"  \
+          "new object locations")                                           \
                                                                             \
   product(uintx, HeapMaximumCompactionInterval, 20,                         \
           "How often should we maximally compact the heap (not allowing "   \
@@ -1195,8 +1195,8 @@ class CommandLineFlags {
   develop(bool, ParallelOldMTUnsafeUpdateLiveData, false,                   \
           "Use the Parallel Old MT unsafe in update of live size")          \
                                                                             \
-  develop(bool, TraceChunkTasksQueuing, false,                              \
-          "Trace the queuing of the chunk tasks")                           \
+  develop(bool, TraceRegionTasksQueuing, false,                             \
+          "Trace the queuing of the region tasks")                          \
                                                                             \
   product(uintx, ParallelMarkingThreads, 0,                                 \
           "Number of marking threads concurrent gc will use")               \

src/share/vm/utilities/taskqueue.cpp

@@ -109,72 +109,72 @@ void ParallelTaskTerminator::reset_for_reuse() {
   }
 }
 
-bool ChunkTaskQueueWithOverflow::is_empty() {
-  return (_chunk_queue.size() == 0) &&
+bool RegionTaskQueueWithOverflow::is_empty() {
+  return (_region_queue.size() == 0) &&
          (_overflow_stack->length() == 0);
 }
 
-bool ChunkTaskQueueWithOverflow::stealable_is_empty() {
-  return _chunk_queue.size() == 0;
+bool RegionTaskQueueWithOverflow::stealable_is_empty() {
+  return _region_queue.size() == 0;
 }
 
-bool ChunkTaskQueueWithOverflow::overflow_is_empty() {
+bool RegionTaskQueueWithOverflow::overflow_is_empty() {
   return _overflow_stack->length() == 0;
 }
 
-void ChunkTaskQueueWithOverflow::initialize() {
-  _chunk_queue.initialize();
+void RegionTaskQueueWithOverflow::initialize() {
+  _region_queue.initialize();
   assert(_overflow_stack == 0, "Creating memory leak");
   _overflow_stack =
-    new (ResourceObj::C_HEAP) GrowableArray<ChunkTask>(10, true);
+    new (ResourceObj::C_HEAP) GrowableArray<RegionTask>(10, true);
 }
 
-void ChunkTaskQueueWithOverflow::save(ChunkTask t) {
-  if (TraceChunkTasksQueuing && Verbose) {
+void RegionTaskQueueWithOverflow::save(RegionTask t) {
+  if (TraceRegionTasksQueuing && Verbose) {
     gclog_or_tty->print_cr("CTQ: save " PTR_FORMAT, t);
   }
-  if(!_chunk_queue.push(t)) {
+  if(!_region_queue.push(t)) {
     _overflow_stack->push(t);
   }
 }
 
-// Note that using this method will retrieve all chunks
+// Note that using this method will retrieve all regions
 // that have been saved but that it will always check
 // the overflow stack.  It may be more efficient to
 // check the stealable queue and the overflow stack
 // separately.
-bool ChunkTaskQueueWithOverflow::retrieve(ChunkTask& chunk_task) {
-  bool result = retrieve_from_overflow(chunk_task);
+bool RegionTaskQueueWithOverflow::retrieve(RegionTask& region_task) {
+  bool result = retrieve_from_overflow(region_task);
   if (!result) {
-    result = retrieve_from_stealable_queue(chunk_task);
+    result = retrieve_from_stealable_queue(region_task);
   }
-  if (TraceChunkTasksQueuing && Verbose && result) {
+  if (TraceRegionTasksQueuing && Verbose && result) {
     gclog_or_tty->print_cr("  CTQ: retrieve " PTR_FORMAT, result);
   }
   return result;
 }
 
-bool ChunkTaskQueueWithOverflow::retrieve_from_stealable_queue(
-                                   ChunkTask& chunk_task) {
-  bool result = _chunk_queue.pop_local(chunk_task);
-  if (TraceChunkTasksQueuing && Verbose) {
-    gclog_or_tty->print_cr("CTQ: retrieve_stealable " PTR_FORMAT, chunk_task);
+bool RegionTaskQueueWithOverflow::retrieve_from_stealable_queue(
+                                   RegionTask& region_task) {
+  bool result = _region_queue.pop_local(region_task);
+  if (TraceRegionTasksQueuing && Verbose) {
+    gclog_or_tty->print_cr("CTQ: retrieve_stealable " PTR_FORMAT, region_task);
   }
   return result;
 }
 
-bool ChunkTaskQueueWithOverflow::retrieve_from_overflow(
-                                        ChunkTask& chunk_task) {
+bool
+RegionTaskQueueWithOverflow::retrieve_from_overflow(RegionTask& region_task) {
   bool result;
   if (!_overflow_stack->is_empty()) {
-    chunk_task = _overflow_stack->pop();
+    region_task = _overflow_stack->pop();
     result = true;
   } else {
-    chunk_task = (ChunkTask) NULL;
+    region_task = (RegionTask) NULL;
     result = false;
   }
-  if (TraceChunkTasksQueuing && Verbose) {
-    gclog_or_tty->print_cr("CTQ: retrieve_stealable " PTR_FORMAT, chunk_task);
+  if (TraceRegionTasksQueuing && Verbose) {
+    gclog_or_tty->print_cr("CTQ: retrieve_stealable " PTR_FORMAT, region_task);
   }
   return result;
 }

src/share/vm/utilities/taskqueue.hpp

@@ -557,32 +557,32 @@ class StarTask {
 typedef GenericTaskQueue<StarTask>     OopStarTaskQueue;
 typedef GenericTaskQueueSet<StarTask>  OopStarTaskQueueSet;
 
-typedef size_t ChunkTask;  // index for chunk
-typedef GenericTaskQueue<ChunkTask>    ChunkTaskQueue;
-typedef GenericTaskQueueSet<ChunkTask> ChunkTaskQueueSet;
+typedef size_t RegionTask;  // index for region
+typedef GenericTaskQueue<RegionTask>    RegionTaskQueue;
+typedef GenericTaskQueueSet<RegionTask> RegionTaskQueueSet;
 
-class ChunkTaskQueueWithOverflow: public CHeapObj {
+class RegionTaskQueueWithOverflow: public CHeapObj {
  protected:
-  ChunkTaskQueue              _chunk_queue;
-  GrowableArray<ChunkTask>*   _overflow_stack;
+  RegionTaskQueue              _region_queue;
+  GrowableArray<RegionTask>*   _overflow_stack;
 
  public:
-  ChunkTaskQueueWithOverflow() : _overflow_stack(NULL) {}
+  RegionTaskQueueWithOverflow() : _overflow_stack(NULL) {}
   // Initialize both stealable queue and overflow
   void initialize();
   // Save first to stealable queue and then to overflow
-  void save(ChunkTask t);
+  void save(RegionTask t);
   // Retrieve first from overflow and then from stealable queue
-  bool retrieve(ChunkTask& chunk_index);
+  bool retrieve(RegionTask& region_index);
   // Retrieve from stealable queue
-  bool retrieve_from_stealable_queue(ChunkTask& chunk_index);
+  bool retrieve_from_stealable_queue(RegionTask& region_index);
   // Retrieve from overflow
-  bool retrieve_from_overflow(ChunkTask& chunk_index);
+  bool retrieve_from_overflow(RegionTask& region_index);
   bool is_empty();
   bool stealable_is_empty();
   bool overflow_is_empty();
-  juint stealable_size() { return _chunk_queue.size(); }
-  ChunkTaskQueue* task_queue() { return &_chunk_queue; }
+  juint stealable_size() { return _region_queue.size(); }
+  RegionTaskQueue* task_queue() { return &_region_queue; }
 };
 
-#define USE_ChunkTaskQueueWithOverflow
+#define USE_RegionTaskQueueWithOverflow