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From "Mikhail Loenko" <mloe...@gmail.com>
Subject Re: [drlvm] Regression caused by compressed VTable pointers
Date Fri, 14 Dec 2007 16:20:30 GMT
How it worked before?

2007/12/14, Xiao-Feng Li <xiaofeng.li@gmail.com>:
> On Dec 14, 2007 9:39 PM, Eugene Ostrovsky <eugene.s.ostrovsky@gmail.com> wrote:
> > Hi all!
> >
> > We have a regression in stress test suite:
> > http://issues.apache.org/jira/browse/HARMONY-5047
> >
> > The problem is that in compressed VTable pointers mode (which is
> > default for x86_64 platforms) number of classes that VM could load is
> > limited by the size of VTable memory pool = 8 MB. VM  crashes because
> > VT pool is overflowed when the test tries to load about 34000 classes.
> > (VTable for each class is >= 232 B)
> >
> > It seems that we need smarter memory management for VTables in compressed mode.
> > Or probably we should disable compressed VTable pointers at all.
>
> Eugene, agree. I guess it should be easy to have a resizable pool for
> Vtables by preserving bigger address space for it. Of course,
> uncompressed vtable is also a solution.
>
> Thanks,
> xiaofeng
>
> > Proposals are welcome.
> >
> > Thanks,
> > Eugene.
> >
>
>
>
> --
> http://xiao-feng.blogspot.com
>

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