RFR: Deflate idle monitors per thread

[Roman Kennke]

CC'ing Aleksey. OpenJDK lists are down atm.

Roman

Am 15.05.2017 um 21:21 schrieb Roman Kennke:
> Current idle monitor deflation happens when all thread have arrived at
> safepoint, but is single-threaded by the VM thread. This patch
> implements per-thread idle monitor deflation. This will deflate monitors
> when GC calls into Thread::oops_do() or possibly_parallel_oops_do(), and
> utilizes the GC worker threads to deflate monitors. This should
> parallelize well, and behave better on caches (synchronizer roots are
> scanned right after deflation!). All is enabled by
> -XX:+DeflateIdleMonitorsPerThread.
>
> http://cr.openjdk.java.net/~rkennke/deflate-per-thread/webrev.00/
> <http://cr.openjdk.java.net/%7Erkennke/deflate-per-thread/webrev.00/>
>
>
> Testing: specjvm, hotspot_gc_shenandoah
>
> Ok?
>
> Roman
>
>