linux-kernel - Re: perf-stat per thread results

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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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