linux-kernel - Re: [PATCH 3/7] sched: update the idle statistics in get_cpu_idle_time

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Message-ID: <4BD5F930.7010409@redhat.com>
Date:	Mon, 26 Apr 2010 16:36:00 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Arjan van de Ven <arjan@...radead.org>
CC:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	mingo@...e.hu, peterz@...radead.org, tglx@...utronix.de,
	davej@...hat.com, cpufreq@...r.kernel.org
Subject: Re: [PATCH 3/7] sched: update the idle statistics in get_cpu_idle_time_us()

On 04/18/2010 03:01 PM, Arjan van de Ven wrote:
>  From 60851b131900af03bf013afef69f3bcdbb04f1d6 Mon Sep 17 00:00:00 2001
> From: Arjan van de Ven<arjan@...ux.intel.com>
> Date: Sun, 18 Apr 2010 10:41:30 -0700
> Subject: [PATCH 3/7] sched: update the idle statistics in get_cpu_idle_time_us()
>
> Right now, get_cpu_idle_time_us() only reports the idle statistics
> upto the point the CPU entered last idle; not what is valid right now.
>
> This patch adds an update of the idle statistics to get_cpu_idle_time_us(),
> so that calling this function always returns statistics that are accurate
> at the point of the call.
>
> This includes resetting the start of the idle time for accounting purposes
> to avoid double accounting.
>
> Signed-off-by: Arjan van de Ven<arjan@...ux.intel.com>

Reviewed-by: Rik van Riel <riel@...hat.com>

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