linux-kernel - Re: perf tools miscellaneous questions

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Date:	Tue, 09 Nov 2010 12:07:12 +0100
From:	Francis Moreau <francis.moro@...il.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Stephane Eranian <eranian@...gle.com>,
	linux-perf-users@...r.kernel.org
Subject: Re: perf tools miscellaneous questions

Frederic Weisbecker <fweisbec@...il.com> writes:

> On Thu, Nov 04, 2010 at 09:52:09AM +0100, Francis Moreau wrote:

[...]

>> 
>> No problem, but yes this part should be documented somewhere. And I
>> think the syntax of event too, specially the modifier like 'u' or 'p'.
>
> Ah that is documented in "man perf-list".

Ok, after updating my 3 weeks old kernel, modifiers are now documented.

But I failed to generate it:

    XMLTO perf-record.1
xmlto: /home/fmoreau/linux-2.6/tools/perf/Documentation/perf-record.xml does not validate (status 3)

BTW, what does 'skid' mean ? s(?) k(?) instruction delay ?

[...]

> I have the same problem. But running perf record with this :p works
> for me. Which is what we want: pebs is useful for sampling, not
> counting-only.

That makes sense but I still have a problem:

   $ perf record -e cache-misses:p -p $(pgrep test)

  Error: perfcounter syscall returned with -1 (No space left on device)

  Fatal: No CONFIG_PERF_EVENTS=y kernel support configured?


> Ah and that won't work if you don't run some intel CPU I think.  Check
> you have PEBS support in /proc/cpuinfo

It seems so:

   $ grep -qi pebs /proc/cpuinfo && echo pebs
   pebs

Thanks
-- 
Francis
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