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

Jeremy Manson jeremymanson at google.com
Mon Aug 3 22:20:48 UTC 2015


What's the matter with the JEP that Jungwoo sent?

http://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2015-July/014092.html

Jeremy

On Mon, Aug 3, 2015 at 2:06 PM, Martijn Verburg <martijnverburg at gmail.com>
wrote:

> We'd certainly like to see a JEP for this.  There are use cases where CMS
> is the right collector and this proposed patch could (I'll stress could)
> significantly improve its performance.
>
> Cheers,
> Martijn
>
> On 3 August 2015 at 19:53, Jon Masamitsu <jon.masamitsu at oracle.com> wrote:
>
>> Jungwoo,
>>
>> As you can see no one has stepped up to do your review.
>> We’ve talked about it amongst the active GC committers.
>> It’s a large change and would require a very significant
>> commitment of anyone’s time.  As is obvious, our focus
>> is on G1.  And right now we’re in the position of having to
>> push tasks we’ve long planned for JDK 9 out into a JDK 9
>> update.  No one I’ve talked with is willing to push off more
>> of our G1 work to get this patch in.  And as maintainers
>> of the HotSpot GC's due diligence is required of us before
>> we can accept this change.
>>
>> Jon
>>
>> PS.  I saw that you said you had started another thread for this
>> discussion (or maybe the discussion of the JEP) but I could not
>> it.    Please feel free to repost this under the new subject.
>>
>> On 06/27/2015 05:48 PM, Jungwoo Ha wrote:
>>
>> Sorry for the long wait. So many things have cleaned up on JDK9.
>> Here is the webrev against jdk9/hs-rt.
>> http://cr.openjdk.java.net/~jwha/8086706/webrev.jdk9.00
>>
>> I am preparing for the JEP doc.
>>
>>
>> On Thu, Jun 11, 2015 at 12:31 PM, Kim Barrett <kim.barrett at oracle.com>
>> wrote:
>>
>>> On Jun 11, 2015, at 12:33 PM, Volker Simonis <volker.simonis at gmail.com>
>>> wrote:
>>> >
>>> > Hi,
>>> >
>>> > if nobody has already started doing it, I'll try to forward port the
>>> > patch to jdk9/hs-gc/hotspot.
>>>
>>> You’ll want to use jdk9/hs-rt rather than jdk9/hs-gc.
>>>
>>>
>>>
>>
>>
>> --
>> Jungwoo Ha | Java Platform Team | jwha at google.com
>>
>>
>>
>
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