Integrated: 8256688: Shenandoah: Lock rank inversion after JDK-8212879

[Zhengyu Gu]

On Fri, 20 Nov 2020 01:02:20 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

> After JDK-8212879, gc_notification() takes JvmtiTagMap_lock/24, while ShenandoahConcurrentWeakRootsEvacUpdateTask holds StringDedupQueue_lock/11, which results lock rank inversion during concurrent weak root processing.
> 
> This patch ensures that no lock is held when triggers gc notification.
> 
> Test:
> - [x] hotspot_gc_shenandoah

This pull request has now been integrated.

Changeset: 266dea06
Author:    Zhengyu Gu <zgu at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/266dea06
Stats:     17 lines in 3 files changed: 15 ins; 0 del; 2 mod

8256688: Shenandoah: Lock rank inversion after JDK-8212879

Reviewed-by: rkennke

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PR: https://git.openjdk.java.net/jdk/pull/1334