RFR(S/M): 8246476: remove AsyncDeflateIdleMonitors option and the safepoint based deflation mechanism

[Daniel D. Daugherty]

Ping! Any takers??? Code deletion should be really appealing here!!

Dan


On 7/6/20 12:35 PM, Daniel D. Daugherty wrote:
> Greetings,
>
> It's time to remove the AsyncDeflateIdleMonitors option from JDK16. We 
> can
> also get rid of the safepoint based deflation mechanism since turning off
> async deflation (-XX:-AsyncDeflateIdleMonitors) was the only way left to
> use it.
>
> This is marked as an "S/M" review because the number of touched/deleted
> lines makes it a Medium review, but the number of touched/changed lines
> (outside of the deletions) makes it a Small review. It's actually a 
> pretty
> fast read... :-)
>
> Here's the bug ID:
>
>     JDK-8246476 remove AsyncDeflateIdleMonitors option and the safepoint
>                 based deflation mechanism
>     https://bugs.openjdk.java.net/browse/JDK-8246476
>
> Here's the webrev URL:
>
>     http://cr.openjdk.java.net/~dcubed/8246476-webrev/0_for_jdk16/
>
> The webrev is baselined on Thomas S's fix for 8248650 which is jdk-16+4
> plus a dozen or so changesets.
>
> This change has been tested with Mach5 Tier[1-3],4,5,6,7,8 and there are
> no regressions (and very few known failures). My inflation stress testing
> is still in process. I had to restart that testing after a thunderstorm
> related power failure took down my servers in Florida. Sigh...
>
> Thanks, in advance, for any comments, questions, or suggestions.
>
> Dan