linux-kernel - Re: latest perf code fails to parse existing data file

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Date:	Tue, 03 Sep 2013 09:40:14 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	David Ahern <dsahern@...il.com>
CC:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: latest perf code fails to parse existing data file

On 03/09/13 00:37, David Ahern wrote:
> Arnaldo/Adrian:
> 
> Latest acme core tree fails to parse an existing data file:
> 
> $ perf trace -i perf.data
> 0x16b8 [0x40]: failed to process type: 1
> Failed to process events, error -22

I can't reproduce this.  The following works:

	$ perf --version
	perf version 3.9.10-100.fc17.x86_64
	$ sudo perf record -e raw_syscalls:* ls
	...
	$ tools/perf/perf --version
	perf version 3.11.rc4.g31cd38
	$ sudo tools/perf/perf script
	...
	$ sudo tools/perf/perf trace -i perf.data
	...

> 
> git bisect traced it to:
> $ git bisect bad
> 75562573bab35b129cfd342fc2bcf89da84a6644 is the first bad commit
> commit 75562573bab35b129cfd342fc2bcf89da84a6644
> Author: Adrian Hunter <adrian.hunter@...el.com>
> Date:   Tue Aug 27 11:23:09 2013 +0300
> 
>     perf tools: Add support for PERF_SAMPLE_IDENTIFIER
> 
>     Enable parsing of samples with sample format bit PERF_SAMPLE_IDENTIFIER.
>     In addition, if the kernel supports it, prefer it to selecting
>     PERF_SAMPLE_ID thereby allowing non-matching sample types.
> 
>     Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
>     Cc: David Ahern <dsahern@...il.com>
>     Cc: Frederic Weisbecker <fweisbec@...il.com>
>     Cc: Ingo Molnar <mingo@...nel.org>
>     Cc: Jiri Olsa <jolsa@...hat.com>
>     Cc: Mike Galbraith <efault@....de>
>     Cc: Namhyung Kim <namhyung@...il.com>
>     Cc: Paul Mackerras <paulus@...ba.org>
>     Cc: Peter Zijlstra <peterz@...radead.org>
>     Cc: Stephane Eranian <eranian@...gle.com>
>     Link:
> http://lkml.kernel.org/r/1377591794-30553-8-git-send-email-adrian.hunter@intel.com
> 
>     Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> 
> :040000 040000 7df758341904d77c391b90ab6b6bac97324d144a
> 93839bad8ab2e6d88d3037f3dc8fd721be5e8870 M    tools
> 
> 
> If I revert the patch (and handle the missing __perf_evsel__sample_size in
> the tests code to get it to compile) it works -- file is parsed correctly.
> 
> David
> 
> 

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