linux-kernel - Re: [patch] sched: Keep total / count stats in addition to the max for wait time

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Message-ID: <20080122210659.GA26764@elte.hu>
Date:	Tue, 22 Jan 2008 22:06:59 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [patch] sched: Keep total / count stats in addition to the max
	for wait time


* Arjan van de Ven <arjan@...radead.org> wrote:

> From: Arjan van de Ven <arjan@...ux.intel.com>
> Subject: sched: Keep total / count stats in addition to the max for wait time
> 
> Right now, the linux kernel (with scheduler statistics enabled) keeps 
> track of the maximum time a process is waiting to be scheduled. While 
> the maximum is a very useful metric, tracking average and total is 
> equally useful (at least for latencytop) to figure out the accumulated 
> effect of scheduler delays. The accumulated effect is important to 
> judge the performance impact of scheduler tuning/behavior.

thanks, applied to sched-devel.git.

	Ingo
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