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8220465: Use shadow regions for faster ParallelGC full GCs

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Reviewed-by: sjohanss, tschatzl
This commit is contained in:
Haoyu Li 2019-10-23 21:28:24 +08:00 • committed by Stefan Johansson
parent 026eac269c
commit 7eadf5b372
4 changed files with 326 additions and 40 deletions
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23
src/hotspot/share/gc/parallel/psCompactionManager.hpp
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@ -25,6 +25,7 @@
#ifndef SHARE_GC_PARALLEL_PSCOMPACTIONMANAGER_HPP
#define SHARE_GC_PARALLEL_PSCOMPACTIONMANAGER_HPP
#include "gc/parallel/psParallelCompact.hpp"
#include "gc/shared/taskqueue.hpp"
#include "memory/allocation.hpp"
#include "utilities/stack.hpp"
@ -77,6 +78,7 @@ class ParCompactionManager : public CHeapObj<mtGC> {
private:
OverflowTaskQueue<oop, mtGC> _marking_stack;
ObjArrayTaskQueue _objarray_stack;
size_t _next_shadow_region;
// Is there a way to reuse the _marking_stack for the
// saving empty regions? For now just create a different
@ -85,6 +87,14 @@ private:
static ParMarkBitMap* _mark_bitmap;
// Contains currently free shadow regions. We use it in
// a LIFO fashion for better data locality and utilization.
static GrowableArray<size_t>* _shadow_region_array;
// Provides mutual exclusive access of _shadow_region_array.
// See pop/push_shadow_region_mt_safe() below
static Monitor* _shadow_region_monitor;
Action _action;
HeapWord* _last_query_beg;
@ -109,6 +119,19 @@ private:
// marking stack and overflow stack directly.
public:
static const size_t InvalidShadow = ~0;
static size_t pop_shadow_region_mt_safe(PSParallelCompact::RegionData* region_ptr);
static void push_shadow_region_mt_safe(size_t shadow_region);
static void push_shadow_region(size_t shadow_region);
static void remove_all_shadow_regions();
inline size_t next_shadow_region() { return _next_shadow_region; }
inline void set_next_shadow_region(size_t record) { _next_shadow_region = record; }
inline size_t move_next_shadow_region_by(size_t workers) {
_next_shadow_region += workers;
return next_shadow_region();
}
void reset_bitmap_query_cache() {
_last_query_beg = NULL;
_last_query_obj = NULL;