RFR: 8357481: Excessive CompileTask wait/notify monitor creation [v2]

[Aleksey Shipilev]

On Fri, 23 May 2025 21:28:29 GMT, Dean Long <dlong at openjdk.org> wrote:

> Isn't it true that we only have one CompileTask per CompilerThread? Would it make sense to move this monitor into the CompilerThread instead?

It feels awkward to me to have a logically `CompileTask`-related monitor in `CompilerThread`. Among other things, this will tie the lifecycle of the compile task to the lifecycle of the compiler thread, which gets "interesting" with dynamic number of compiler threads. Plus, I don't think any of this optimization would matter for non-`Xcomp` runs. So I'd steer towards simplicity, and just make this monitor global, as in this PR.

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PR Comment: https://git.openjdk.org/jdk/pull/25364#issuecomment-2908964573