Runtime recalculate GMP kickoff headroom #2119
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dmitripivkine
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comp:gc
depends:omr
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there is tracepoint parameter change in eclipse-omr/omr#2646, for the pullrequest eclipse-omr/omr#2646 to pass openj9 acceptance build might need this pullrequest to merge. |
LinHu2016
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amicic
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Jun 13, 2018
LinHu2016
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- GMP kickoff Headroom was set 1% of heap by default or set by user via -XXgc:tarokKickoffHeadroomRegionCount=. - fixed size headroom count could be too big or too small for some special cases, then trigger the GMP too early or too late. - new tarokKickoffHeadroomRegionRate(default 2% can be set via -XXgc:tarokKickoffHeadroomRegionRate=nn, 0% <= nn<=50%) base on current free memory(not include eden and survivor) for calculating the headroom in bytes. - update -XXgc:tarokKickoffHeadroomRegionCount= option to -XXgc:tarokKickoffHeadroomInBytes to allow the headroom be a fraction of region size. - tarokKickoffHeadroomInBytes is initialized during initializeTaxationThreshold. - tarokKickoffHeadroomInBytes is recalculating during calculatePGCCompactionRate. Signed-off-by: Lin Hu <linhu@ca.ibm.com>
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@charliegracie |
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Jenkins test sanity xlinux jdk8 |
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Jenkins test sanity plinux jdk8 depends eclipse-omr/omr#2646 |
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Sigh I can not properly testing this with PR builds now that the OMR PR has been merged :( |
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Jenkins test sanity plinux jdk8 depends eclipse/omr#master |
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depends eclipse-omr/omr#2646
Signed-off-by: Lin Hu linhu@ca.ibm.com