RFR: 8340547: Starting many threads can delay safepoints [v3]

[Dean Long]

On Tue, 24 Sep 2024 09:27:13 GMT, Oli Gillespie <ogillespie at openjdk.org> wrote:

> > If JVM_StartThread is only called by Thread.start0, then how about putting the new lock in Java instead?
> 
> What benefit do you see of that? One downside is that the lock will be coarser than necessary. I'd rather keep the lock as tightly scoped as possible.

I just thought it would be simpler, but I see your point.  A coarser lock will serialize more of the native path.

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PR Comment: https://git.openjdk.org/jdk/pull/21111#issuecomment-2375195149