RFR: 8150134: Simplify concurrent refinement thread deactivation

[Jon Masamitsu]

Kim,

Change looks good.

Is it correct that the deactivation threshold could be  overshot
in the current implementation because the green zone can be less
than the deactivation threshold?  I don't have any reason to think
that will cause a problem.

I know that the logging messages are  as in the original but
I'd find

Deactivated %d, at threshold:

better than

Deactivated %d, off threshold:

at line 154 in the new version.

Jon



On 02/18/2016 12:20 PM, Kim Barrett wrote:
> Please review this simplification of the deactivation of concurrent
> refinement threads.
>
> I also took the opportunity to move the activate/deactivate logging
> messages for those threads.  One benefit of this is that the primary
> thread (worker_id 0) now generates such log messages.  Note that just
> moving the logging within the activate/deactivate functions wouldn't
> have fixed that, since the primary thread is not currently activated
> via a call to the activate function.  That's an oddity that I plan to
> fix later.
>
> One side effect of the logging change: it is now apparent that the
> primary refinement thread gets activated during a pause, though
> fortunately immediately blocks on the SuspendibleThreadSetJoiner.
> That's another problem that I plan to fix later.
>
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8150134
>
> Webrev:
> http://cr.openjdk.java.net/~kbarrett/8150134/webrev.00/
>
> Testing:
> JPRT
>
>

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