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xen-ia64-devel
Re: [Xen-ia64-devel] [PATCH 0/6] xenoprof: various fixes for correct sam
On Tue, Dec 11, 2007 at 10:03:33AM -0700, Alex Williamson wrote:
>
> On Tue, 2007-12-11 at 18:02 +0900, Isaku Yamahata wrote:
> > This patch set addresses the xenorpfo/ia64 issues reported by Xing.
> >
> > Xing.
> > Could you please try this patch set and report the result?
> >
> > The fundamental change is
> > - make psr virtualization code not touch mPSR.pp.
> > The Xenoprof basic idea is that xenoprof owns PMU so that this is required.
> > Anyway the currently code doesn't seem to handle mPSR.pp consistently
> > so that some kind of clean up is needed.
> > This clean up might upset a guset that think it's owning PMU.
> > But at this moment PMU isn't virtualized so that this doesn't an issue.
> >
> > Limitations:
> > Currently perfmon knows only kernel mode (cpl=0) and user mode(cpl=3).
> > On the other hand Xen/IA64 uses other cpls.
> > At this moment only generic pmc/pmd's are supported.
>
> I haven't tested this, but it looks ok to me. It would be nice to
> have xenoprof working for 3.2. Please let me know when you have
> confidence this is ready for inclusion. Thanks,
I'm already confident for inclusion.
My rough test showed that sampling of xen VMM, PV kernel, PV user process,
VTi kernel, VTi user process was done as expected.
Probably a document is necessary on how to use and its limitation.
So I'll write it.
--
yamahata
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