RFR (S) 8231932: Shenandoah: conc/par GC threads ergonomics overrides user settings

[Roman Kennke]

Looks OK to me.

Thanks!
Roman


Am 7. Oktober 2019 14:51:19 MESZ schrieb Aleksey Shipilev <shade at redhat.com>:
>Bug:
>  https://bugs.openjdk.java.net/browse/JDK-8231932
>
>Fix:
>  https://cr.openjdk.java.net/~shade/8231932/webrev.01/
>
>This manifests in tier1 tests, and that is actually the UX problem. New
>test captures it directly.
>Patched code favors adjusting the setting that was selected
>ergonomically, which leaves the user
>setting alone.
>
>Also, it is awkward to adjust the GC threads settings silently (which
>is why test failed without
>proper message), and we should fail on misconfiguration right away,
>which explains the adjustments
>in existing tests.
>
>Testing: new test, hotspot_gc (with Shenandoah), tier1 (with
>Shenandoah), hotspot_gc_shenandoah
>
>-- 
>Thanks,
>-Aleksey

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