RFR: JDK-8293114: JVM should trim the native heap

[Aleksey Shipilev]

On Thu, 6 Jul 2023 10:47:25 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> About Pause in all VM ops, an alternative would be to just check in the trimmer if we are at safepoint, and if yes treat it as pause. I'll see if that's easier (I'm worried about pulling a mutex or atomic increasing the pauser variable in every VM op we run).

Oh yes, I like it. We can just check `SafepointSynchronize::is_at_safepoint()` and `SafepointSynchronize::is_synchronizing()`. Would be even better, because we could stop trimming when there is safepoint sync pending. Makes the whole thing much less intrusive.

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PR Comment: https://git.openjdk.org/jdk/pull/14781#issuecomment-1623462984