RFR : PPC64 : Need support for VSR spills in ppc.ad

[Gustavo Romero]

Hi Martin,

On 01/24/2018 11:07 AM, Doerr, Martin wrote:
> Hi Gustavo,
> 
> I think the change should be tested a little longer before requesting a backport.

I see. Do you suggest testing it in any particular way or should we wait
OpenJDK 11 LTS goes GA so it begins to be tested more widely once it reaches
out the distros (Ubuntu, SLES, and RHEL)?


> But in general, I'm not against it if you do all the work. Please note that I can't push to 8u (I'm not a 8u committer or reviewer).

Got it. Sure, I would do all the work in that case :-)

I think you can still be a (r)eviewer even not being an 8u (R)eviewer in case a
backport does not apply cleanly to 8u and needs a new review on the hotspot ML?


Best regards,
Gustavo

> Best regards,
> Martin
> 
> 
> -----Original Message-----
> From: Gustavo Romero [mailto:gromero at linux.vnet.ibm.com] 
> Sent: Mittwoch, 24. Januar 2018 13:40
> To: Michihiro Horie <HORIE at jp.ibm.com>; Doerr, Martin <martin.doerr at sap.com>
> Cc: Lindenmaier, Goetz <goetz.lindenmaier at sap.com>; hotspot-dev at openjdk.java.net; ppc-aix-port-dev at openjdk.java.net
> Subject: Re: RFR : PPC64 : Need support for VSR spills in ppc.ad
> 
> Hi Martin,
> 
> I think Michi measured the effectivity of this change using SPECjbb2015 and got
> about 4% of performance improvement in max-jOPS.
> 
> Many of our clients still use OpenJDK 8 and I understand that although currently
> there isn't a new schedule ahead of 8u162 [1], 8 will continue to receive
> updates once 8u162 is GA. So I would to backport it to jdk8u/jdk8u so distros
> can grab it on the next security update (roughly). Are you ok with that?
> 
> If you are ok, since this change depends upon other changes that introduced the
> support for VSX, is it fine if I start backporting them firstly instead
> of this one? What do you recommend?
> 
> Thank you.
> 
> 
> Regards,
> Gustavo
> 
> [1] http://openjdk.java.net/projects/jdk8u/
>