Suppress error warning in HotSpot backports

[Volker Simonis]

On Tuesday, March 18, 2014, Andrew Haley <aph at redhat.com> wrote:

> On 03/18/2014 06:48 PM, Volker Simonis wrote:
> > On Tue, Mar 18, 2014 at 7:24 PM, Andrew Haley <aph at redhat.com<javascript:;>>
> wrote:
> >>
> >> My thought is that tools like Netbeans, the Java build itself, etc,
> >> are covered with -XX:MaxPermSize usages.  These are needed, and people
> >> aren't going to want to remove them, and neither are they going to
> >> want their screen full of warnings.  Would you?
> >
> > But that's exactly the point  - with HS25 they aren’t needed because
> > there is no PermGen any more and the VM can now freely load classes
> > unless you run out of physical memory (or set MaxMetaspaceSize which
> > is 2^64/2^32 by default).
> >
> > So if people upgrade to Java 8 they will need to remove this option or
> > live with the warning.
>
> But this is Java 7.


Yes, but with HS25 which makes  it behave exactly like Java 8 in this
respect!

So once again: if people upgrade to Java 8 OR Java 7 with HS 25 they will
need to remove this option or live with the warning

By the way, that's the price you have to pay if you are using -XX options.
It would be the same if you would switch to IBM J9 which of course is Java
compatible but doesn't know about PermGen.


> >>> And you may have noticed, that the hsx-project
> >>> will be dissolved
> >>> (
> http://mail.openjdk.java.net/pipermail/hotspot-dev/2013-December/011973.html
> )
> >>> after jdk8 has been released (which should be actually today:)
> >>
> >> Sure, I know, but ... why does that matter?
> >
> > Because there will be no place any more, where you can stabilize a
> > specific HS version - at least not in the OpenJDK forests. Every Java
> > 8 update will have its own HS version which is a clone of the HS25 in
> > 8u-dev at some point in time.
> >
> > And there will be just one HS version for Java 9 (in jdk9/hs/hotspot).
> >
> > So if you'd like to downport a new HS version from 9 to 8 youll need
> > to clone jdk9/hs/hotspot and stabilize that clone. But there’s
> > currently neither a project nor a repository for such a task in the
> > OpenJDK. The same applies if you'd like to downport a HS from 8 to 7 -
> > you'd need to clone jdk8u/hotspot and stabilize that for 7. But again,
> > there's no infrastructure for that any more - that was previously done
> > in the various hsx repositories (i.e. hsx/hsx24, hsx//hsx25, ..). But
> > they will be made read-only after the Java 8 release.
>
> Oh, I see.  I had no intention of using HSX for this, so it hadn't
> occurred to me that it might be a problem.
>
> Andrew.
>
>