RFR: 8305670: Performance regression in LockSupport.unpark with lots of idle threads [v4]

[Daniel D. Daugherty]

On Fri, 21 Apr 2023 15:45:08 GMT, Daniel D. Daugherty <dcubed at openjdk.org> wrote:

>> src/hotspot/share/runtime/globals.hpp line 953:
>> 
>>> 951:                                                                             \
>>> 952:   product(bool, EnableThreadSMRExtraValidityChecks, true, DIAGNOSTIC,       \
>>> 953:              "Enable Thread SMR extra validity checks")                     \
>> 
>> Do you still want to make this change as part of this PR?
>
> Yes I would. All the analysis is recorded in this bug and the PR.

I think I'm going to change my mind on this topic. I'll likely split the
EnableThreadSMRExtraValidityChecks changes off into a sub-task.
This will allow for easier reviewing and backport decisions (if any for
this particular fix).

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PR Review Comment: https://git.openjdk.org/jdk/pull/13519#discussion_r1179404497