RFR (XS): 8140689: Skip last young-only gc if nothing to do in the mixed gc phase

Mikael Gerdin mikael.gerdin at oracle.com
Thu Nov 5 12:19:28 UTC 2015


Hi Thomas,

On 2015-10-29 17:47, Thomas Schatzl wrote:
> Hi all,
>
>    can I have reviews for another change that minimizes the turnaround
> time between one marking round and another one?
>
> In this case, if GC cleanup detects that there is nothing to reclaim, it
> will immediately request an initial mark for the next young-only gc.
> Previously there had been the requirement that the next young-only gc
> after marking must be a "regular" young-only gc.
> This wastes some time until we have a new up-to-date view of the
> liveness, potentially ending in full gcs.
>
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8140689
> Webrev:
> http://cr.openjdk.java.net/~tschatzl/8140689/webrev

Looks good to me.
/Mikael

> Testing:
> jprt, vm.gc, manual testing
>
> Thanks,
>    Thomas
>
>



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