RFR: 8290344: Start/stop displaysync affects performance in metal rendering pipeline

[Alexey Ushakov]

On Mon, 1 Aug 2022 17:48:18 GMT, Alexey Ushakov <avu at openjdk.org> wrote:

> > Looking at the RenderPerfTest numbers ClipFlatOvalAA went down .. but everything else improved by at the very least a statistically significant amount so why did that one test get worse ?
> 
> I'm unable to re-run the testing because of a regression [JDK-8291266](https://bugs.openjdk.org/browse/JDK-8291266). I'll be back to this pull request after resolving the regression.

I've re-run RenderPerfTest 5 times and used a median for each test case. So, now there are no regressions.

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PR: https://git.openjdk.org/jdk/pull/9512