RFR: 8244551: Shenandoah: Fix racy update of update_watermark

Roman Kennke rkennke at redhat.com
Wed May 6 21:31:03 UTC 2020

Disregard this webrev, it contains another change, and Zhengyu also
pointed out that I got volatile HeapWord* wrong: it should be HeapWord*
volatile of course. I'll post another webrev tomorrow.


> See bug for discussion:
> https://bugs.openjdk.java.net/browse/JDK-8244551
> Fix is to make _update_watermark volatile and access to it ordered
> correctly with load_acquire() and release_store().
> http://cr.openjdk.java.net/~rkennke/JDK-8244551/webrev.00/
> Testing: testcase mentioned in bug on aarch64 several times,
> hotspot_gc_shenandoah
> Ok?
> Roman

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