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SubjectRe: [RFC PATCH 3/3 v2] perf: Update perf tool to monitor uncore events
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On Sun, 2010-11-21 at 20:09 +0800, Andi Kleen wrote:
> >
> > samples pcnt function DSO
> > _______ _____ ______________________
> > ____________________________________
> >
> > 8.00 18.6% kallsyms_expand_symbol [kernel.kallsyms]
>
> Reporting a symbol for an uncore event seems highly misleading.
> After all the uncore counter has no idea for which core the event was,
> so there isn't really any instruction pointer to report.
> The event could be event caused by a PCI device or similar.
>
> For per function monitoring of uncore events one has to use
> OFFCORE_RESPONSE, like I implemented recently.

Let me look at this and then get back to you.

Thanks.

>
> I would suggest to not report any symbol names for uncore events.
> Doing so just will confuse users.
>
> In fact I suspect uncore events are only really useful
> with "stat", but not with "top", or if they are used in top
> then the symbol reporting should be disabled.
>
> -Andi
>
>




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