Mercurial > hg > graal-compiler
diff src/share/vm/gc_implementation/parallelScavenge/psCompactionManager.hpp @ 4095:bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
Summary: Select number of GC threads dynamically based on heap usage and number of Java threads
Reviewed-by: johnc, ysr, jcoomes
author | jmasa |
---|---|
date | Tue, 09 Aug 2011 10:16:01 -0700 |
parents | f95d63e2154a |
children | 7913e93dca52 |
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--- a/src/share/vm/gc_implementation/parallelScavenge/psCompactionManager.hpp Tue Nov 22 04:47:10 2011 -0500 +++ b/src/share/vm/gc_implementation/parallelScavenge/psCompactionManager.hpp Tue Aug 09 10:16:01 2011 -0700 @@ -48,6 +48,7 @@ friend class StealRegionCompactionTask; friend class UpdateAndFillClosure; friend class RefProcTaskExecutor; + friend class IdleGCTask; public: @@ -85,7 +86,31 @@ // Is there a way to reuse the _marking_stack for the // saving empty regions? For now just create a different // type of TaskQueue. - RegionTaskQueue _region_stack; + RegionTaskQueue* _region_stack; + + static RegionTaskQueue** _region_list; + // Index in _region_list for current _region_stack. + uint _region_stack_index; + + // Indexes of recycled region stacks/overflow stacks + // Stacks of regions to be compacted are embedded in the tasks doing + // the compaction. A thread that executes the task extracts the + // region stack and drains it. These threads keep these region + // stacks for use during compaction task stealing. If a thread + // gets a second draining task, it pushed its current region stack + // index into the array _recycled_stack_index and gets a new + // region stack from the task. A thread that is executing a + // compaction stealing task without ever having executing a + // draining task, will get a region stack from _recycled_stack_index. + // + // Array of indexes into the array of region stacks. + static uint* _recycled_stack_index; + // The index into _recycled_stack_index of the last region stack index + // pushed. If -1, there are no entries into _recycled_stack_index. + static int _recycled_top; + // The index into _recycled_stack_index of the last region stack index + // popped. If -1, there has not been any entry popped. + static int _recycled_bottom; Stack<Klass*> _revisit_klass_stack; Stack<DataLayout*> _revisit_mdo_stack; @@ -104,7 +129,6 @@ // Array of tasks. Needed by the ParallelTaskTerminator. static RegionTaskQueueSet* region_array() { return _region_array; } OverflowTaskQueue<oop>* marking_stack() { return &_marking_stack; } - RegionTaskQueue* region_stack() { return &_region_stack; } // Pushes onto the marking stack. If the marking stack is full, // pushes onto the overflow stack. @@ -116,10 +140,33 @@ Action action() { return _action; } void set_action(Action v) { _action = v; } + RegionTaskQueue* region_stack() { return _region_stack; } + void set_region_stack(RegionTaskQueue* v) { _region_stack = v; } + inline static ParCompactionManager* manager_array(int index); + inline static RegionTaskQueue* region_list(int index) { + return _region_list[index]; + } + + uint region_stack_index() { return _region_stack_index; } + void set_region_stack_index(uint v) { _region_stack_index = v; } + + // Pop and push unique reusable stack index + static int pop_recycled_stack_index(); + static void push_recycled_stack_index(uint v); + static void reset_recycled_stack_index() { + _recycled_bottom = _recycled_top = -1; + } + ParCompactionManager(); + ~ParCompactionManager(); + // Pushes onto the region stack at the given index. If the + // region stack is full, + // pushes onto the region overflow stack. + static void region_list_push(uint stack_index, size_t region_index); + static void verify_region_list_empty(uint stack_index); ParMarkBitMap* mark_bitmap() { return _mark_bitmap; } // Take actions in preparation for a compaction.