linux-kernel - Re: [perf] howto switch from pfmon

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Date:	Tue, 23 Jun 2009 16:21:22 +0200
From:	Brice Goglin <Brice.Goglin@...ia.fr>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>, paulus@...ba.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [perf] howto switch from pfmon

Ingo Molnar wrote:
> You can also do a profile with such events:
>
>   perf record -f -e r1000ffe0 ./hackbench 10
>
> and look at it via 'perf report'.
>   

I am not sure what the perf.data profile file contains but 'perf report'
only shows percentages. Is there a way to get a 'perf stat'-like output
from 'perf report'? Or maybe just have a -f option in 'perf stat' to
send the output into a file (with the PID in the name).

By the way, there's a typo in the description in
tools/perf/Documentation/perf-report.txt, you want s/via perf report/via
perf record/

> [ Note, there's no need to specify any --follow-* flags as that is
>   implicit in 'perf'. (and you'll probably also notice that perf
>   stat is a lot faster at following fast-forking or
>   context-switching workloads than is pfmon, because it's not ptrace
>   based.) ]
>   

What about threads? I didn't find any way to get per-thread counters.

Ideally, I'd like to be able to see no perf-related output on
stdout/stderr at runtime, and later have a look at per-thread counters
like 'perf stat' does at runtime.

thanks,
Brice

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