Integrated: 8357481: Excessive CompileTask wait/notify monitor creation

[Aleksey Shipilev]

On Wed, 21 May 2025 18:40:24 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> See bug for rationale.
> 
> This PR implements the 2nd solution from the bug: lift the lock to be global. As described in the bug, excess locking work would realistically affect Xcomp, and only in a minor way. But we will reap a minor footprint/latency benefit by not constructing the lock for every `CompileTask`.
> 
> Additional testing:
>  - [x] Linux x86_64 server fastdebug, `compiler`
>  - [x] Linux x86_64 server fastdebug, `all`
>  - [x] Linux AArch64 server fastdebug, `all`

This pull request has now been integrated.

Changeset: b3594c9e
Author:    Aleksey Shipilev <shade at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/b3594c9e5508101a39d10099830f04b0c09ad41f
Stats:     26 lines in 5 files changed: 5 ins; 10 del; 11 mod

8357481: Excessive CompileTask wait/notify monitor creation

Reviewed-by: vlivanov, kvn

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PR: https://git.openjdk.org/jdk/pull/25364