RFR (XXS): 8200365: TestOptionsWithRanges.java of '-XX:TLABWasteTargetPercent=100' fails intermittently

[sangheon.kim at oracle.com]

Hi Thomas,

On 8/9/18 3:34 AM, Thomas Schatzl wrote:
> Hi,
>
>    can I have reviews for this tiny fix that fixes startup issues with
> serial, parallel and CMS collectors?
>
> The reason is that high values of TLABWasteTargetPercent (>=26) cause
> TLABs getting to large during startup with default ergonomics, causing
> a GC when a second Java thread wants to allocate its TLAB.
> However at that time we do not support GCs, and so the VM forcibly
> fails.
>
> The fix is to increase the number of refills per thread for the initial
> TLAB size calculation only.
>
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8200365
> Webrev:
> http://cr.openjdk.java.net/~tschatzl/8200365/webrev/
> Testing:
> Running failing test with serial/parallel/cms 400 times each without
> failure.
Looks good.

Thanks,
Sangheon


>
> Thanks,
>    Thomas