linux-kernel - Re: [PATCH] perf tools: Fix reading of perf.data file header

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Date:	Thu, 06 Aug 2009 22:03:08 +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: [PATCH] perf tools: Fix reading of perf.data file header

Ingo Molnar wrote:
> * Brice Goglin <Brice.Goglin@...ia.fr> wrote:
>
>   
>> $ /mnt/scratch/bgoglin/cpunode/linux-2.6.31/tools/perf/perf report -D |
>> grep _READ | sort -k5
>> 0x8bb8 [0x30]: PERF_EVENT_READ: 6268 6268 raw 0x1000001e0 494628
>> 0x8fc0 [0x30]: PERF_EVENT_READ: 6268 6268 raw 0x1000002e0 209113
>> 0x9698 [0x30]: PERF_EVENT_READ: 6268 6268 raw 0x1000004e0 307215
>> 0x9cf8 [0x30]: PERF_EVENT_READ: 6268 6268 raw 0x1000008e0 9203221
>> 0x8a08 [0x30]: PERF_EVENT_READ: 6268 6269 raw 0x1000001e0 9210788
>> 0x9020 [0x30]: PERF_EVENT_READ: 6268 6269 raw 0x1000002e0 302344
>> 0x9608 [0x30]: PERF_EVENT_READ: 6268 6269 raw 0x1000004e0 198705
>> 0x9d28 [0x30]: PERF_EVENT_READ: 6268 6269 raw 0x1000008e0 473471
>> [...]
>>
>> Now I know which thread actually reads from where.
>> Looks like we're good to go now! thanks a lot Peter!
>>
>> Tested-by: Brice Goglin <Brice.Goglin@...ia.fr>
>>     
>
> Thanks Brice.
>
> It would be nice to add this as some "perf report -s/--stats" flag, 
> to not have to go via -D (which is a 'print debug output' kind of 
> ad-hoc thing and subject to format changes in the future).
>
> Would you be interested in sending a patch that adds that flag to 
> 'perf report', to print out these statistics entries (if any), in a 
> tabular form suitable for your purposes? Below is a past patch to 
> builtin-report.c that shows how to add new options.
>
>   

I'll see what I can do. I have been looking at the code tonight before
Peter fixed the last problem but I didn't manage to understand much of
the code so far. So thanks for the example patch :)

Brice

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