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Message-ID: <4DCDB886.7090909@gmail.com>
Date: Fri, 13 May 2011 17:02:30 -0600
From: David Ahern <dsahern@...il.com>
To: Wim Heirman <wim@...rman.net>, Ingo Molnar <mingo@...e.hu>,
Arnaldo Carvalho de Melo <acme@...hat.com>
CC: linux-kernel@...r.kernel.org,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Thomas Gleixner <tglx@...utronix.de>,
Frédéric Weisbecker <fweisbec@...il.com>,
Brice Goglin <Brice.Goglin@...ia.fr>
Subject: Re: perf-stat per thread results
On 05/13/11 14:32, Wim Heirman wrote:
> Hi,
>
>> It's supposed to do that if --stat is specified, and it used to work - see this
>> commit:
>>
>> 8d51327090ac: perf report: Fix and improve the displaying of per-thread event counters
>>
>> and the output there:
>>
>> # PID TID cache-misses cache-references
>> 4658 4659 495581 3238779
>> 4658 4662 498246 3236823
>> 4658 4663 499531 3243162
>>
>> which appears to be roughly what Wim is asking for, AFAICT.
>
> Thanks, this is exactly what I'm looking for. In 2.6.32 (Ubuntu 10.04)
> it works, although if I use --pid rather than the -- <command> variant
> the first thread seams to be missing. In 2.6.38 (Ubuntu 11.04) the
> first thread is missing in both use cases, and I get one column per
> processor (which in itself is fine).
>
> Regards,
> Wim
Hmm.... my mileage varies using latest kernel
(446cc6345d3de6571bdd0840f48aca441488a28d)
$ /tmp/build-perf/perf record --stat -fo /tmp/perf.data -p $(pidof rsyslogd)
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.007 MB /tmp/perf.data (~308 samples) ]
$ /tmp/build-perf/perf report -T -i /tmp/perf.data
# Events: 6 cycles
#
# Overhead Command Shared Object Symbol
# ........ ........ ................. ..........................
#
97.61% rsyslogd libc-2.13.so [.] __libc_disable_asynccancel
2.39% rsyslogd [kernel.kallsyms] [k] native_write_msr_safe
#
# (For a higher level overview, try: perf report --sort comm,dso)
#
# PID TID
ie., I do not get the counter values. Specifying the counter with -e
(e.g., -e branch-misses) does not help -- still no counter output.
David
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