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7182260: G1: Fine grain RSet freeing bottleneck

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Chain the fine grain PerRegionTables in an individual RSet together and free them in bulk using a single operation.

Reviewed-by: johnc, brutisso
This commit is contained in:
Thomas Schatzl 2012-07-17 12:24:05 -07:00 • committed by John Cuthbertson
parent 6fdfe86bbd
commit 7ac8896f1d
2 changed files with 172 additions and 62 deletions
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13
hotspot/src/share/vm/gc_implementation/g1/heapRegionRemSet.hpp
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@ -82,6 +82,14 @@ class OtherRegionsTable VALUE_OBJ_CLASS_SPEC {
PerRegionTable** _fine_grain_regions;
size_t _n_fine_entries;
// The fine grain remembered sets are doubly linked together using
// their 'next' and 'prev' fields.
// This allows fast bulk freeing of all the fine grain remembered
// set entries, and fast finding of all of them without iterating
// over the _fine_grain_regions table.
PerRegionTable * _first_all_fine_prts;
PerRegionTable * _last_all_fine_prts;
// Used to sample a subset of the fine grain PRTs to determine which
// PRT to evict and coarsen.
size_t _fine_eviction_start;
@ -114,6 +122,11 @@ class OtherRegionsTable VALUE_OBJ_CLASS_SPEC {
static size_t _from_card_cache_max_regions;
static size_t _from_card_cache_mem_size;
// link/add the given fine grain remembered set into the "all" list
void link_to_all(PerRegionTable * prt);
// unlink/remove the given fine grain remembered set into the "all" list
void unlink_from_all(PerRegionTable * prt);
public:
OtherRegionsTable(HeapRegion* hr);