[8u] RFA (S) 8059677: Thread.getName() instantiates Strings

[Roger Riggs]

+1

On 2/1/2016 7:05 AM, Aleksey Shipilev wrote:
> Hi,
>
> I would like to backport a simple performance optimization to 8u:
>    https://bugs.openjdk.java.net/browse/JDK-8059677
>
> This change was in JDK 9 for at least a year now, and no problems were
> apparently discovered. The change comes in two parts:
>    http://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/9dc4d4fc73ca
>    http://hg.openjdk.java.net/jdk9/jdk9/jdk/rev/0bddfc90d139
>
> Review thread:
>
> http://mail.openjdk.java.net/pipermail/core-libs-dev/2014-November/029569.html
>
> Note that Roger had specific concerns about backporting, which seem
> unproblematic:
>
> http://mail.openjdk.java.net/pipermail/core-libs-dev/2014-November/029589.html
>
> JDK part applies without problems, and HS part needs some fuzz in
> vm/runtime/thread.cpp. These are the proposed webrevs against 8u, for
> convenience:
>    http://cr.openjdk.java.net/~shade/8059677/8u/webrev.01.hs/
>    http://cr.openjdk.java.net/~shade/8059677/8u/webrev.01.jdk/
>
> I re-ran full JPRT against 8u with this change, and it was clean.
>
> Cheers,
> -Aleksey
>
>