RFA 8056248: Improve ForkJoin thread throttling

[Paul Sandoz]

On Sep 5, 2014, at 12:09 PM, Seán Coffey <sean.coffey at oracle.com> wrote:

> I don't see CCC approval for an 8u backport either. Please ensure that's been completed also.
> 

Does it need a CCC if the property is not specified?

Paul.

> regards,
> Sean.
> 
> On 05/09/14 10:54, Alan Bateman wrote:
>> On 05/09/2014 10:35, Paul Sandoz wrote:
>>> Hi,
>>> 
>>> I would like to backport the improvements to the fork join framework from 9 to 8u40:
>>> 
>>> http://mail.openjdk.java.net/pipermail/core-libs-dev/2014-August/028419.html
>>> 
>>>   https://bugs.openjdk.java.net/browse/JDK-8056248
>>> 
>>> http://cr.openjdk.java.net/~psandoz/jdk9/JDK-8056248-fj-thread-throttling/webrev/
>>> 
>>>   http://hg.openjdk.java.net/jdk9/dev/jdk/rev/7af64e3e095d
>>> 
>>> The changeset (when shuffled) imports cleanly into jdk8u-dev/jdk.
>>> 
>>> However, it also introduced a new system property ("java.util.concurrent.ForkJoinPool.common.maximumSpares"). I am not sure if we can add such a new feature to an 8u release, any advice?
>> It updates the spec so I assume would require a MR if you want this to update the Java SE 8 spec.
>> 
>> Maybe the simplest for 8u is to put this under an @implNote so that it's clear to anyone generating the javadoc for 8u that this property is JDK-implementation specific (at least in in 8u).
>> 
>> -Alan.
>