Re: [PATCH] perf, x86: Enabled PEBS event to be exported in a raw format

Peter Zijlstra
2012-07-03T09:15:24Z

On Tue, 2012-07-03 at 17:36 +1000, Michael Ellerman wrote:
> On Fri, 2012-06-29 at 00:00 +0800, Feng Tang wrote:
> > From: Andi Kleen <ak@linux.intel.com>
> >
> > Add support for reporting PEBS records in a raw format that can
> > be then parsed by perf script.
> >
> > This is roughly similar to the existing AMD IBS support.
> >
> > This is mainly for advanced users and to experiment with
> > new usages. Widespread PEBS usages are expected to get higher
> > level interfaces over time, like the existing "precise ip" support.
>
> Hi folks,
>
> Pardon if I slightly hijack this thread, but we'd like to do something
> similar to this on powerpc.

Do expand. What does exact information does it provide?

> I've been telling people not to use PERF_SAMPLE_RAW because it provides
> no way for the consumer to know what data they're getting, and it's not
> extensible in any way.
>
> So is shovelling things out using PERF_SAMPLE_RAW generally acceptable
> for "advanced usage" scenarios?

No.