Messages in this thread | | | From | Francis Moreau <> | Subject | Re: perf tools miscellaneous questions | Date | Tue, 09 Nov 2010 12:07:12 +0100 |
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Frederic Weisbecker <fweisbec@gmail.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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