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From: bert hubert <ahu@ds9a.nl>
To: Andrew Morton <akpm@osdl.org>
Cc: Peter Chubb <peterc@gelato.unsw.edu.au>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] 2.6.0-test4 -- add context switch counters
Date: Wed, 27 Aug 2003 16:41:01 +0200	[thread overview]
Message-ID: <20030827144101.GA31458@outpost.ds9a.nl> (raw)
In-Reply-To: <20030826181807.1edb8c48.akpm@osdl.org>

On Tue, Aug 26, 2003 at 06:18:07PM -0700, Andrew Morton wrote:

> >  always zero.  The appended patch adds fields to struct task_struct to
> >  count context switches, and adds code to do the counting.

> OK...  Why is this useful?  A bit of googling doesn't show much interest in
> it.

I'm unaware of the cost of accounting this, but I for one have had
occasions where my system was reporting 20kcs, and I had no clue which
process was causing it. After a while I learned that linuxthreads on SMP can
cause this.

> What apps should be reporting this info?  /usr/bin/time?

/proc/$$/stat would also be nice.

Thanks.

-- 
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  parent reply	other threads:[~2003-08-27 14:41 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-08-27  0:57 Peter Chubb
2003-08-27  1:18 ` Andrew Morton
2003-08-27  1:29   ` Mike Fedyk
2003-08-27  1:52     ` Peter Chubb
2003-08-27  7:16     ` William Lee Irwin III
2003-08-27  7:39       ` Peter Chubb
2003-08-27  7:51         ` William Lee Irwin III
2003-08-28 16:55           ` Mike Fedyk
2003-08-28 17:07             ` William Lee Irwin III
2003-08-28 17:09             ` William Lee Irwin III
2003-08-28 17:48               ` Mike Fedyk
2003-08-27  8:10         ` William Lee Irwin III
2003-08-27  1:50   ` Peter Chubb
2003-08-27  7:26     ` William Lee Irwin III
2003-11-18  1:18       ` William Lee Irwin III
2003-08-27 14:41   ` bert hubert [this message]
2003-08-27  6:54 ` William Lee Irwin III
2003-08-27 15:52   ` Larry McVoy
2003-08-27 16:01     ` William Lee Irwin III
2003-08-27 16:09       ` Larry McVoy
2003-08-27 17:57         ` William Lee Irwin III

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