[jdk21u-dev] RFR: 8325587: Shenandoah: ShenandoahLock should allow blocking in VM

[Aleksey Shipilev]

On Mon, 13 May 2024 09:03:48 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Clean backport of fixing rare long hand shake while mutator threads in heavy contention on ShenandoahLock.
>> 
>> Additional testing:
>> - [x] Linux aarch64 server fastdebug, hotspot/jtreg/tier1 with +UseShenandoahGC
>
> Too early for 21u-dev anyway; there are follow-up improvements that we want to resolve first, and then backport all of them at once, so that JDK 21 is not in some intermediate state.

> Rampdown for 21.0.4 started. So, @shipilev, is it time now to approve this for 21.0.5 or shall we wait?

We are working on [JDK-8331411](https://bugs.openjdk.org/browse/JDK-8331411), I would instead prefer wait for that to complete and then backport both back to back.

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PR Comment: https://git.openjdk.org/jdk21u-dev/pull/560#issuecomment-2136983553