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From "Ivan Volosyuk" <ivan.volos...@gmail.com>
Subject Re: [DRLVM][GC] high-level design proposal for GCV5
Date Fri, 25 Aug 2006 15:27:04 GMT
The HARMONY-881 patch was submitted quite some time ago. I'm also
looking forward to see it integrated.
--
Regards,
Ivan

On 8/25/06, Xiao-Feng Li <xiaofeng.li@gmail.com> wrote:
> Ivan, Salikh, good idea and thanks for the info. We'd want to apply
> the work into Harmony GC.
>
> Thanks,
> xiaofeng
>
>
> On 8/25/06, Salikh Zakirov <Salikh.Zakirov@intel.com> wrote:
> > Ivan Volosyuk wrote:
> > > Yes, I have experimented with per-slot verification of write barrier.
> > >
> > > The idea was the following: each word in java heap has external mirror
> > > record. After garbage collection all mirror records are synchronized
> > > with the heap. Each write barrier updates mirror record with
> > > corresponding data. Before next garbage collection there is a trace
> > > for all reachable objects in heap which validates that each slot
> > > contains the same data as the mirror.
> > >
> > > The idea is quite simple. Even that, it helped my find number of
> > > places in VM code which have updated slots in heap without call to
> > > write barrier. The results of the work are in HARMONY-504.
> > >
> > > The scheme has one impotant limitation. When several threads write to
> > > single slot, this verifier may report false-positive result of missing
> > > write barrier. But, I didn't see such situtations in any workloads I
> > > have tested it with.
> >
> > The infrastructure based on the same idea, but independent of GC implementation
> > is submitted as HARMONY-881. It provides patch for the VM, which incorporates
> > the heap mirroring framework for write barrier verification into the VM core,
> > and can work with any garbage collector.
> >
> >
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> >
>
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>


-- 
Ivan
Intel Middleware Products Division

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