linux-kernel - Re: [PATCH][RFC] Adding transition of CPU frequency counting support to perfcounters

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Date:	Sat, 18 Jul 2009 18:09:15 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	mitake@....info.waseda.ac.jp
Cc:	mingo@...e.hu, fweisbec@...il.com, linux@...do.de,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH][RFC] Adding transition of CPU frequency counting
 support to perfcounters

On Sat, 2009-07-18 at 23:11 +0900, mitake@....info.waseda.ac.jp wrote:
> 
> Oh, my perf could count cpufreq events!
> Thanks for your nice advice!
> 
> % perf stat -a sleep 60
> 
>  Performance counter stats for 'sleep 60':
> 
>   479088.075595  task-clock-msecs         #      7.984 CPUs
>          199080  context-switches         #      0.000 M/sec
>           19584  CPU-migrations           #      0.000 M/sec
>          322978  page-faults              #      0.001 M/sec
>              29  cpufreq-up               #      0.000 M/sec
>              42  cpufreq-down             #      0.000 M/sec
>     73703367828  cycles                   #    153.841 M/sec
>     52005203450  instructions             #      0.706 IPC
>       209762467  cache-references         #      0.438 M/sec
>        84916856  cache-misses             #      0.177 M/sec
> 
>    60.009508200  seconds time elapsed
> 
> And I'm using ondemand governor now,
> so kernel thread [kondemand] context causes freq transition.
> I didn't notice that...
> 
> Could you merge this patch?
> Can I send this patch with descriptions and Signed-off-by?

Why, what is the usecase?

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