RFR: 8221360: Eliminate Shared_DirtyCardQ_lock

[Thomas Schatzl]

On Mon, 23 Aug 2021 13:55:11 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> > Another reason probably why these cards are put into the shared DCQS was that that card will be processed at a time when that situation can't re-occur. So this change might cause that card (buffer) to be re-enqueued and reprocessed many times while waiting for that object to get fully visible.
> 
> Dirty card buffers are processed in fifo order, so this single-card buffer
> starts at the end of the line. Also, we generally keep some number of cards in
> the queue. So it's going to take some time for this card to make it through
> all that and be reconsidered.

I agree that there should typically be enough delay until that buffer/card gets reprocessed.

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PR: https://git.openjdk.java.net/jdk/pull/5118