linux-kernel - Re: [PROBLEM] perf report is broken in latest linus git

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Message-ID: <20090813093648.GA22762@elte.hu>
Date:	Thu, 13 Aug 2009 11:36:48 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	paulus@...ba.org, linux-kernel@...r.kernel.org
Subject: Re: [PROBLEM] perf report is broken in latest linus git


* Pekka Enberg <penberg@...helsinki.fi> wrote:

> Latest Linus git kernel with -rc4 perf userspace:
> 
>   penberg@...berg-laptop:~/testing/jato$ perf record -f jato HelloWorldSwing
>   [ perf record: Captured and wrote 1.402 MB perf.data (~61261 samples) ]
> 
>   penberg@...berg-laptop:~/testing/jato$ perf report --sort comm,dso,symbol|head -30
>   # Samples: 60457
>   #
>   # Overhead  Command                            Shared Object  Symbol
>   # ........  .......  .......................................  ......
>   #
> 
>   [ Note: the jato executable doesn't appear anywhere in the trace. I'm
>     pretty sure the libzip functions, for example, are from jato, not perf.  ]
> 
>       36.14%     perf  /home/penberg/bin/perf                   [.] dso__synthesize_plt_symbols
>       35.20%     perf  /home/penberg/bin/perf                   [.] dso__new
>        3.57%     perf  /home/penberg/bin/jato                   [.] 0x0000000000c910

Perhaps it's this commit:

4d1e00a: perf symbol: Fix symbol parsing in certain cases: use the build-id as a symlink

it does not revert cleanly, so you might want to check out these two 
commits:

  4d1e00a
  4d1e00a~1

and build perf on both, and check with your anomalous perf.data 
(without changing it) whether the output makes most sense.

	Ingo
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