RFR: 8238867: Improve G1DirtyCardQueueSet::Queue::pop
ivan.walulya at oracle.com
Thu Feb 13 09:40:34 UTC 2020
This is a good fix to blocking on the last element. (Not a reviewer).
> On 12 Feb 2020, at 01:45, Kim Barrett <kim.barrett at oracle.com> wrote:
> Please review this change to G1DirtyCardQueueSet::Queue::pop.
> Previously, if there was exactly one element in the queue, a pop
> operation could not return it, because doing so could break invariants
> for concurrent operations. Now, if there is one element and there are
> concurrent pop operations, one of those operations will win. Note
> that there are still races between pop and push/append that may
> prevent the pop operation from obtaining an element.
> mach5 tier1-3.
> mach5 tier1-5 (only linux-x64) in conjunction with other changes.
> Some performance testing didn't find any unexpected differences.
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