RFR (S): 8140585: PLAB statistics are flushed too late

Jon Masamitsu jon.masamitsu at oracle.com
Mon Nov 9 22:28:16 UTC 2015


Change looks good.

Would this edit of the Description

"This leads to PLAB size adjustment appearing to be for the
next GC."

be better than the current

"This leads to the PLAB size adjustment being one GC too late."


On 10/28/2015 01:44 PM, Thomas Schatzl wrote:
> Hi all,
>    can I have reviews for this bug M. Chernov reported a few days ago?
> PLAB statistics flushing (i.e. updating the G1EvacStats data structure)
> is done too late so that the PrintPLAB printout shows and uses the
> previous' GCs values, which may negatively affect PLAB statistics
> measurements.
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8140585
> Webrev:
> http://cr.openjdk.java.net/~tschatzl/8140585/webrev
> Testing:
> jtreg, vm.gc, new jtreg test
> Thanks,
>    Thomas

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