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7146246: G1: expose some of the -XX flags that drive which old regions to collect during mixed GCs

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Make two G1 cmd line flags available in product builds: G1HeapWastePercent (previously called: G1OldReclaimableThresholdPercent) and G1MixedGCCountTarget (previous called: G1MaxMixedGCNum). Also changed the default of the former from 1% to 5% and the default for G1OldCSetRegionLiveThresholdPercent to 90%.

Reviewed-by: azeemj, jwilhelm, johnc
This commit is contained in:
Antonios Printezis 2012-03-23 10:53:19 -04:00
parent 006def0451
commit 450d6e8d9a
3 changed files with 8 additions and 9 deletions
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2
hotspot/src/share/vm/gc_implementation/g1/collectionSetChooser.cpp
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@ -285,7 +285,7 @@ size_t CollectionSetChooser::calcMinOldCSetLength() {
// that the result is the same during all mixed GCs that follow a cycle.
const size_t region_num = (size_t) _length;
const size_t gc_num = (size_t) G1MaxMixedGCNum;
const size_t gc_num = (size_t) G1MixedGCCountTarget;
size_t result = region_num / gc_num;
// emulate ceiling
if (result * gc_num < region_num) {