HotSpot development trees

[Dr Andrew John Hughes]

On 00:17 Sat 29 Oct     , Erik Trimble wrote:
> On 10/27/2011 11:58 PM, Krystal Mok wrote:
> > Hi all,
> >
> > HS21 introduced quite a few behavioral changes that OpenJDK 6 users 
> > might not be expecting. One of them would be the progress of PermGen 
> > removal, which affects some tuning. It might still be pretty much 
> > compatible, but no one has been testing for JDK6/HS21 compatibility, 
> > right?
> >
> > From what we can see from the outside, recent JDK 6 releases from 
> > Oracle are staying on HotSpot 20.x, with some bug fixes applied.
> >
> > My question is:
> > Are there any plans from Oracle/OpenJDK to release further updates to 
> > OpenJDK 6, with the bug fixes applied to HotSpot Express 20's master 
> > repo? Or, could there be a list of recommended list of bug 
> > fixes/patches that should be backported to HS20?
> >
> > We're stuck on JDK 6 now, with no plans to move to JDK 7 in the near 
> > future, our work would have to base on HS20. So backporting bugfixes 
> > to HS20 is kind of like "scratching my own itch". If there's anything 
> > outside contributors can do about this, I'm more than willing to help.
> >
> > Regards,
> > Kris Mok
> >
> > Software Engineer
> > Taobao (http://www.taobao.com)
> >
> 
> I admit I'm not as intimately aware of what's going on in the JVM as I 
> once was, but I see no real reason why HS21 or better shouldn't work 
> under OpenJDK 6, *provided* that during the backport process, certain 
> features are either permanently disabled, or just turned off by default.
> 

Any idea what these features are?

I'll look at providing hs22 as an IcedTea option as a first step.

-- 
Andrew :)

Free Java Software Engineer
Red Hat, Inc. (http://www.redhat.com)

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