RFR (S): 8155810: Bound the number of root region scan threads to the number of survivor regions

[Jon Masamitsu]

Thomas,

On 05/02/2016 05:35 AM, Thomas Schatzl wrote:
> Hi all,
>
>    can I have reviews for this change that originated from the
> discussion about JDK-8150393 where it has been found
> that G1ConcurrentMark::scan_root_regions() always starts all threads
> for scanning the root regions independent of the number of root regions
> available. This potentially leads to starting (and needing to
> synchronize for) to too many threads on huge machines (and on smaller
> ones if the conditions are met of course).
>
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8155810
> Webrev:
> http://cr.openjdk.java.net/~tschatzl/8155810/webrev/

Change looks good.

Jon

> Testing:
> jprt
>
> Thanks,
>    Thomas

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