From: Andrew Morton <akpm@linux-foundation.org>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Glauber Costa <glommer@parallels.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org,
Russell King - ARM Linux <linux@arm.linux.org.uk>,
Paul Tuner <pjt@google.com>
Subject: Re: [PATCH v2] proc: speedup /proc/stat handling
Date: Wed, 25 Jan 2012 17:04:16 -0800 [thread overview]
Message-ID: <20120125170416.385ee9fa.akpm@linux-foundation.org> (raw)
In-Reply-To: <1327469372.14373.31.camel@edumazet-laptop>
On Wed, 25 Jan 2012 06:29:32 +0100
Eric Dumazet <eric.dumazet@gmail.com> wrote:
> Le mardi 24 janvier 2012 __ 17:27 -0800, Andrew Morton a __crit :
>
> > I had a fiddle on an 8-way x86_64 machine. I'm unable to demonstrate
> > any improvement for either of
> >
> > time (for i in $(seq 1000); do; cat /proc/self/stat > /dev/null; done)
> > time (for i in $(seq 1000); do; cat /proc/1/stat > /dev/null; done)
> >
> > oh well.
>
> What size is /proc/stat ?
About 40mm, but it depends on the font size.
> wc -c /proc/stat
>
> If under 4096, there is no problem with existing code.
akpm2:/home/akpm> wc -c /proc/stat
2800 /proc/stat
> I had the problem on a 16-way machine.
OK..
next prev parent reply other threads:[~2012-01-26 1:04 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-20 15:59 [PATCH] proc: speedup /proc/stat handling Eric Dumazet
2012-01-20 22:55 ` Andrew Morton
2012-01-23 10:16 ` KAMEZAWA Hiroyuki
2012-01-23 10:33 ` Glauber Costa
2012-01-24 1:25 ` KAMEZAWA Hiroyuki
2012-01-25 0:01 ` [PATCH v2] " Eric Dumazet
2012-01-25 0:12 ` Andrew Morton
2012-01-25 0:22 ` Eric Dumazet
2012-01-25 1:27 ` Andrew Morton
2012-01-25 5:29 ` Eric Dumazet
2012-01-26 1:04 ` Andrew Morton [this message]
2012-01-26 9:55 ` KAMEZAWA Hiroyuki
2012-01-27 0:43 ` Andrew Morton
2012-01-27 1:09 ` KAMEZAWA Hiroyuki
2012-01-27 1:18 ` Andrew Morton
2012-01-30 5:16 ` [PATCH] Add num_to_str() for speedup /proc/stat KAMEZAWA Hiroyuki
2012-01-30 23:20 ` Andrew Morton
2012-01-30 23:58 ` KAMEZAWA Hiroyuki
2012-02-01 14:43 ` Andrea Righi
2012-02-01 23:46 ` KAMEZAWA Hiroyuki
2012-01-27 7:09 ` [PATCH v2] proc: speedup /proc/stat handling Eric Dumazet
2012-01-25 0:18 ` KAMEZAWA Hiroyuki
2012-01-25 0:26 ` Eric Dumazet
2012-01-30 8:06 ` Jörg-Volker Peetz
2012-01-30 9:25 ` Eric Dumazet
2012-01-30 10:00 ` Jörg-Volker Peetz
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