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src/hotspot/share/gc/parallel/psCompactionManager.hpp
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rev 57222 : imported patch shadow-regions-final-fixes
@@ -23,10 +23,11 @@
*/
#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"
class MutableSpace;
@@ -75,18 +76,27 @@
static PSOldGen* _old_gen;
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
// type of TaskQueue.
RegionTaskQueue _region_stack;
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;
oop _last_query_obj;
size_t _last_query_ret;
@@ -107,10 +117,23 @@
void stack_push(oop obj);
// Do not implement an equivalent stack_pop. Deal with the
// 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;
_last_query_ret = 0;
}
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