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8205921: Optimizing best-of-2 work stealing queue selection

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Bias towards stealing from queues that we recently successfully stole from to decrease the number of unsuccessful steal attempts.

Co-authored-by: Thomas Schatzl <thomas.schatzl@oracle.com>
Reviewed-by: eosterlund, kbarrett
This commit is contained in:
Zhengyu Gu 2018-08-03 11:06:10 +02:00
parent c4faf01f86
commit 4555c28590
19 changed files with 119 additions and 93 deletions
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3
src/hotspot/share/gc/cms/concurrentMarkSweepGeneration.hpp
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@ -544,8 +544,6 @@ class CMSCollector: public CHeapObj<mtGC> {
Stack<oop, mtGC> _preserved_oop_stack;
Stack<markOop, mtGC> _preserved_mark_stack;
int* _hash_seed;
// In support of multi-threaded concurrent phases
YieldingFlexibleWorkGang* _conc_workers;
@ -713,7 +711,6 @@ class CMSCollector: public CHeapObj<mtGC> {
bool stop_world_and_do(CMS_op_type op);
OopTaskQueueSet* task_queues() { return _task_queues; }
int* hash_seed(int i) { return &_hash_seed[i]; }
YieldingFlexibleWorkGang* conc_workers() { return _conc_workers; }
// Support for parallelizing Eden rescan in CMS remark phase