linux-kernel - Re: perf report does not get along with perf record -A

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Date:	Tue, 26 Jun 2012 08:24:06 -0600
From:	David Ahern <dsahern@...il.com>
To:	Martin Rosenberg <mrosenberg@...illa.com>
CC:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: perf report does not get along with perf record -A

On 6/25/12 6:10 PM, Martin Rosenberg wrote:
> I'm working under the assumption that if I want to collect statistics from multiple runs of a program, I can do this by running
> perf record prog; perf record -A prog; perf record -A prog
>
> I've found that running perf record twice results in perf report hanging, and running it more than twice results in perf report first spewing a message about invalid formats, then crashing.
> A log of the session, as well as the binary, its input and perf.data can be found at:
>
> http://www.club.cc.cmu.edu/~mjrosenb/ion/perf_crash.tar.gz


Append has been broken for a long time (v2.6.36 last working version).

git bisect points to:

commit 55b44629f599a2305265ae9c77f9d9bcfd6ddc17
Author: Thomas Gleixner <tglx@...utronix.de>
Date:   Tue Nov 30 17:49:46 2010 +0000

     perf session: Use sensible mmap size

     On 64bit we can map the whole file in one go, on 32bit we can at 
least map
     32MB and not map/unmap tiny chunks of the file.

     Base the progress bar on 1/16 of the data size.

     Preparatory patch to get rid of the malloc/memcpy/free of trace data.

     Cc: Ingo Molnar <mingo@...e.hu>
     Cc: Peter Zijlstra <peterz@...radead.org>
     Cc: Frederic Weisbecker <fweisbec@...il.com>
     LKML-Reference: <20101130163820.213687773@...utronix.de>
     Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
     Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>

:040000 040000 a0d7ddfb30b562a548052b12b142b579aa888886 
dd4e368cbdf0ba24126afcc0fe42feea3b68f4a7 M	tools


The commit right before that one (d65132) dumps some errors, but at 
least does not hang -- spinning in the event processing.

David
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