RFR: 8345423: Shenandoah: Parallelize concurrent cleanup

[Y. Srinivas Ramakrishna]

On Wed, 9 Apr 2025 20:17:55 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Not clean

src/hotspot/share/gc/shenandoah/shenandoahFreeSet.cpp line 1273:

> 1271: 
> 1272: void ShenandoahFreeSet::recycle_trash() {
> 1273:   // lock is not non-reentrant, check we don't have it

Double negative.

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PR Review Comment: https://git.openjdk.org/shenandoah-jdk21u/pull/172#discussion_r2038407750