RFR (XL): JDK-8086706 Parallel Full GC for CMS

Volker Simonis volker.simonis at gmail.com
Thu Jun 11 16:33:35 UTC 2015


if nobody has already started doing it, I'll try to forward port the
patch to jdk9/hs-gc/hotspot.

Once we have that, we can do the JEP.

@Jungwoo: I can assist you with the JEP creation and the whole process
(I've already done that for our PPC/AIX port).


On Thu, Jun 11, 2015 at 6:05 PM, Jon Masamitsu <jon.masamitsu at oracle.com> wrote:
> Jungwoo,
> For a feature enhancement for jdk9 you'll need a JEP
> http://openjdk.java.net/jeps/1
> This is the same process that we use internally at  Oracle.
> Please explain in the JEP that this is a community provided
> and supported feature.  Otherwise, the testing, support,
> performance, etc. teams at Oracle will want to know how
> this impacts them.  I've already been asked.
> On 06/10/2015 03:11 PM, Jungwoo Ha wrote:
> Bug: https://bugs.openjdk.java.net/browse/JDK-8086706
> Code: http://cr.openjdk.java.net/~jwha/8086706/webrev.00
> Here is our code for parallel full GC in CMS.
> We've enabled this by default for a long time, so it won't cause any crash
> easily.
> We see spaces for improvements in scalability, but correctness-wise it
> should be okay.
> Though I had to do some manual edit to create the patch.
> Please take a look and let me know.
> Jon, can you sponsor this change?
> No.  I think that's premature and I also don't think
> this integration should hinge just on me.  When
> the integration is ready, ask for a sponsor on the
> mailing lists.
> Jon
> --
> Jungwoo Ha

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