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8048179: Early reclaim of large objects that are referenced by a few objects

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Push the remembered sets of large objects with few referenced into the dirty card queue at the beginning of the evacuation so that they may end up with zero remembered set entries at the end of the collection, and are potentially reclaimed. Also improve timing measurements of the early reclaim mechanism, and shorten flag names.

Reviewed-by: brutisso, jmasa, dfazunen
This commit is contained in:
Thomas Schatzl 2015-01-07 15:15:37 +01:00
parent 5203f2c751
commit afb458ef0e
11 changed files with 232 additions and 44 deletions
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12
hotspot/src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp
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@ -681,6 +681,18 @@ void OtherRegionsTable::scrub(CardTableModRefBS* ctbs,
clear_fcc();
}
bool OtherRegionsTable::occupancy_less_or_equal_than(size_t limit) const {
if (limit <= (size_t)G1RSetSparseRegionEntries) {
return occ_coarse() == 0 && _first_all_fine_prts == NULL && occ_sparse() <= limit;
} else {
// Current uses of this method may only use values less than G1RSetSparseRegionEntries
// for the limit. The solution, comparing against occupied() would be too slow
// at this time.
Unimplemented();
return false;
}
}
bool OtherRegionsTable::is_empty() const {
return occ_sparse() == 0 && occ_coarse() == 0 && _first_all_fine_prts == NULL;
}