RFR: 8209346: Refactor SATBMarkQueue filter configuration

[Roman Kennke]

Looks  good, thanks!
Roman

Am 13. August 2018 04:12:05 MESZ schrieb Kim Barrett <kim.barrett at oracle.com>:
>Please review this change to how SATBMarkQueue determines whether a
>post-filtered buffer should be enqueued or continue to be used.
>
>The qset's initialize function is now called with an enqueue threshold
>percentage; G1 uses G1SATBBufferEnqueuingThresholdPercentage.  This
>value is translated by initialize into a threshold index recorded in
>the qset.
>
>The queue's should_enqueue_buffer now obtains that threshold index and
>compares it to the post-filter index to determine whether the buffer
>should be enqueued or continue to be used.
>
>This changeset is based on the in-review changes for JDK-8209396 and
>JDK-8209345.
>http://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2018-August/022868.html
>http://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2018-August/022869.html
>
>CR:
>https://bugs.openjdk.java.net/browse/JDK-8209346
>
>Webrev:
>http://cr.openjdk.java.net/~kbarrett/8209346/open.00/
>
>Testing:
>Mach5 tier1-3, hs-tier4-5, in conjunction with JDK-8209345 and
>JDK-8209347.
>Locally tier1 and hotspot_gc without those other changes.

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