Date: Mon, 25 Feb 2008 12:34:39 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: "J.C. Pizarro" <jcpiza@gmail.com>
Cc: "Rik van Riel" <riel@redhat.com>, "Mike Galbraith" <efault@gmx.de>,
       LKML <linux-kernel@vger.kernel.org>,
       "Linus Torvalds" <torvalds@linux-foundation.org>
Subject: Re: Please, put 64-bit counter per task and incr.by.one each ctxt
 switch.
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On Sun, 24 Feb 2008 14:12:47 +0100 "J.C. Pizarro" <jcpiza@gmail.com> wrote:

> It's statistic, yes, but it's a very important parameter for the CPU-scheduler.
> The CPU-scheduler will know the number of context switches of each task
>  before of to take a blind decision into infinitum!.

We already have these:

        unsigned long nvcsw, nivcsw; /* context switch counts */

in the task_struct.
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