RFR: 8318986: Improve GenericWaitBarrier performance [v3]

[Robbin Ehn]

On Tue, 7 Nov 2023 09:49:36 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> src/hotspot/share/utilities/waitBarrier_generic.cpp line 120:
>> 
>>> 118:   SpinYield sp;
>>> 119:   while (Atomic::load_acquire(&_state) < -1) {
>>> 120:     sp.wait();
>> 
>> A warning once would be helpful that cells might be too few.
>
> Yes, but I am a bit uncomfortable with printing performance warnings from a generic synchronization primitive. At very least because it might intermittently break some tests that check the outputs. So I'd rather avoid adding stuff here.

Ok

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PR Review Comment: https://git.openjdk.org/jdk/pull/16404#discussion_r1384714582