Request for approval: 8140483, Atomic*FieldUpdaters final fields should be trusted

[Rob McKenna]

Approved. Please add an appropriate noreg label to the bug.

	-Rob

On 16/11/15 18:23, Aleksey Shipilev wrote:
> Hi,
>
> There is a simple Hotspot compiler change that improves the
> Atomic*FieldUpdater performance by a large margin, and thus provides a
> migration path with the eventual demise of sun.misc.Unsafe. Therefore,
> I'd like us to consider this in 8u76 to expose users to this improvement
> earlier than JDK 9 release. I am not a 8u Committer, so if the change is
> approved, I'd need a sponsor.
>
> Bug:
>    https://bugs.openjdk.java.net/browse/JDK-8140483
>
> Webrev:
>    http://cr.openjdk.java.net/~shade/8140483/webrev.02/
>
> JDK 9 Changeset:
>    http://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/0835ef4e6232
>
> JDK 9 Review:
>
> http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2015-October/019549.html
>
> The change was in jdk9/hs-comp for two weeks now, and a few days in
> jdk9/jdk9.
>
> The patch applies automatically with a bit of the fuzz. jdk8u builds and
> runs fine at least on Linux x86_64, the performance improvement is the
> same as in JDK 9.
>
> Thanks,
> -Aleksey
>