linux-kernel - Re: [GIT PULL] cputime: Full dynticks task/cputime accounting v7

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Message-ID: <CAFTL4hxHUoFchx9wkvfLvOPVRq+P3VSHiZoPRnMJ4YdvzN=TWQ@mail.gmail.com>
Date:	Tue, 29 Jan 2013 04:29:52 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Li Zhong <zhong@...ux.vnet.ibm.com>,
	Namhyung Kim <namhyung.kim@....com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Sedat Dilek <sedat.dilek@...il.com>,
	Gleb Natapov <gleb@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>
Subject: Re: [GIT PULL] cputime: Full dynticks task/cputime accounting v7

2013/1/29 Steven Rostedt <rostedt@...dmis.org>:
> On Tue, 2013-01-29 at 03:39 +0100, Frederic Weisbecker wrote:
>
>> Please send me your kernelspin so I can test as well.
>
> http://rostedt.homelinux.com/private/kernelspin.c

I can't reproduce your issue. I'm getting almost the same results with
vtime + force context tracking and tick based cputime.

3 runs with tick based cputime:

real	0m10.005s
user	0m0.210s
sys	0m9.780s

real	0m10.005s
user	0m0.170s
sys	0m9.820s

real	0m10.005s
user	0m0.130s
sys	0m9.860s

3 runs with vtime + context tracking forced:

real	0m10.005s
user	0m0.807s
sys	0m9.197s

real	0m10.005s
user	0m0.832s
sys	0m9.172s

real	0m10.005s
user	0m0.787s
sys	0m9.218s


> http://rostedt.homelinux.com/private/userspin.c
>
> -- Steve
>
>
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