Re: RFR: 8290344: Start/stop displaysync affects performance in metal rendering pipeline [v2]

[Alexey Ushakov]

> 
> Stopping DisplayLink once we are done with blitting was used to fix 
> https://bugs.openjdk.org/browse/JDK-8259038 . I think with displayLink active 
> count as 4 we might see unnecessary(~4) displayLink callbacks when we just 
> draw text and leave it as noticed in the bug.  But i think this tradeoff is 
> fine as we are trying to achieve balance between power and performance.
> 
> Also this change should not cause state management issues as we are just 
> maintaining displayLink for longer time. @avu Could you please verify that we 
> are not seeing issues like https://bugs.openjdk.org/browse/JDK-8247332 ?

I’ve checked the scenario from JDK-8247332 - everything works as expected.

Best Regards,
Alexey

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