Mercurial > hg > truffle
diff src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 4709:fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
Summary: Cache workers' calculated starting heap region, used for parallel iteration over the collcection set, for subsequent reuse.
Reviewed-by: tonyp, brutisso
| author | johnc |
|---|---|
| date | Wed, 14 Dec 2011 17:43:55 -0800 |
| parents | 3c648b9ad052 |
| children | 441e946dc1af |
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--- a/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp Wed Dec 14 12:15:26 2011 +0100 +++ b/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp Wed Dec 14 17:43:55 2011 -0800 @@ -943,6 +943,16 @@ // discovery. G1CMIsAliveClosure _is_alive_closure_cm; + // Cache used by G1CollectedHeap::start_cset_region_for_worker(). + HeapRegion** _worker_cset_start_region; + + // Time stamp to validate the regions recorded in the cache + // used by G1CollectedHeap::start_cset_region_for_worker(). + // The heap region entry for a given worker is valid iff + // the associated time stamp value matches the current value + // of G1CollectedHeap::_gc_time_stamp. + unsigned int* _worker_cset_start_region_time_stamp; + enum G1H_process_strong_roots_tasks { G1H_PS_mark_stack_oops_do, G1H_PS_refProcessor_oops_do, @@ -1030,6 +1040,9 @@ void reset_gc_time_stamp() { _gc_time_stamp = 0; OrderAccess::fence(); + // Clear the cached CSet starting regions and time stamps. + // Their validity is dependent on the GC timestamp. + clear_cset_start_regions(); } void increment_gc_time_stamp() { @@ -1300,9 +1313,12 @@ bool check_cset_heap_region_claim_values(jint claim_value); #endif // ASSERT - // Given the id of a worker, calculate a suitable - // starting region for iterating over the current - // collection set. + // Clear the cached cset start regions and (more importantly) + // the time stamps. Called when we reset the GC time stamp. + void clear_cset_start_regions(); + + // Given the id of a worker, obtain or calculate a suitable + // starting region for iterating over the current collection set. HeapRegion* start_cset_region_for_worker(int worker_i); // Iterate over the regions (if any) in the current collection set.