RFR: 8331572: Allow using OopMapCache outside of STW GC phases

[Zhengyu Gu]

On Wed, 15 May 2024 20:05:12 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> This looks good but one question for ZGC, does ZGC need an OopMapCache::cleanup_old_entries() ?

We still call `OopMapCache::cleanup_old_entries() ` after STW pause, but now  concurrent phase also can accumulate old entries, should we unify them? e.g. all depend on service thread to clean up old entries?

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PR Comment: https://git.openjdk.org/jdk/pull/19229#issuecomment-2113526362