linux-kernel - Re: Please, put 64-bit counter per task and incr.by.one each ctxt switch.

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Message-Id: <20080225123439.90645f2f.akpm@linux-foundation.org>
Date:	Mon, 25 Feb 2008 12:34:39 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"J.C. Pizarro" <jcpiza@...il.com>
Cc:	"Rik van Riel" <riel@...hat.com>, "Mike Galbraith" <efault@....de>,
	LKML <linux-kernel@...r.kernel.org>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>
Subject: Re: Please, put 64-bit counter per task and incr.by.one each ctxt
 switch.

On Sun, 24 Feb 2008 14:12:47 +0100 "J.C. Pizarro" <jcpiza@...il.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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