RFR(L) 8153224 Monitor deflation prolong safepoints

[Daniel D. Daugherty]

Greetings,

I presented the Async Monitor Deflation OpenJDK Wiki at this week's
Runtime Design Review meeting (in the Runtime staff time slot)...

Karen Kinnear kindly took notes for the meeting and I've attached
them here... I've also attached my replies...

Dan


On 3/24/19 9:57 AM, Daniel D. Daugherty wrote:
> Greetings,
>
> Welcome to the OpenJDK review thread for my port of Carsten's work on:
>
>     JDK-8153224 Monitor deflation prolong safepoints
>     https://bugs.openjdk.java.net/browse/JDK-8153224
>
> Here's a link to the OpenJDK wiki that describes my port:
>
> https://wiki.openjdk.java.net/display/HotSpot/Async+Monitor+Deflation
>
> Here's the webrev URL:
>
> http://cr.openjdk.java.net/~dcubed/8153224-webrev/3-for-jdk13/
>
> Here's a link to Carsten's original webrev:
>
> http://cr.openjdk.java.net/~cvarming/monitor_deflate_conc/0/
>
> Earlier versions of this patch have been through several rounds of
> preliminary review. Many thanks to Carsten, Coleen, Robbin, and
> Roman for their preliminary code review comments. A very special
> thanks to Robbin and Roman for building and testing the patch in
> their own environments (including specJBB2015).
>
> This version of the patch has been thru Mach5 tier[1-8] testing on
> Oracle's usual set of platforms. Earlier versions have been run
> through my stress kit on my Linux-X64 and Solaris-X64 servers
> (product, fastdebug, slowdebug).Earlier versions have run Kitchensink
> for 12 hours on MacOSX, Linux-X64 and Solaris-X64 (product, fastdebug
> and slowdebug). Earlier versions have run my monitor inflation stress
> tests for 12 hours on MacOSX, Linux-X64 and Solaris-X64 (product,
> fastdebug and slowdebug).
>
> All of the testing done on earlier versions will be redone on the
> latest version of the patch.
>
> Thanks, in advance, for any questions, comments or suggestions.
>
> Dan
>
> P.S.
> One subtest in gc/g1/humongousObjects/TestHumongousClassLoader.java
> is currently failing in -Xcomp mode on Win* only. I've been trying
> to characterize/analyze this failure for more than a week now. At
> this point I'm convinced that Async Monitor Deflation is aggravating
> an existing bug. However, I plan to have a better handle on that
> failure before these bits are pushed to the jdk/jdk repo.
>

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Subject: Re: Async Monitor Deflation design review (2019.04.02)
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Subject: Re: Async Monitor Deflation design review (2019.04.02)
Date: Fri, 5 Apr 2019 09:48:24 -0400
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