linux-kernel - Re: [RFC][PATCH] /proc/stat idle field for idle cpus

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Message-ID: <20090420091504.0f619d8f@skybase>
Date:	Mon, 20 Apr 2009 09:15:04 +0200
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	benh@...nel.crashing.org, heiko.carstens@...ibm.com,
	paulus@...ba.org, tony.luck@...el.com,
	seto.hidetoshi@...fujitsu.com, jeremy@...source.com,
	a.p.zijlstra@...llo.nl, mingo@...e.hu,
	Alexey Dobriyan <adobriyan@...il.com>
Subject: Re: [RFC][PATCH] /proc/stat idle field for idle cpus

On Fri, 17 Apr 2009 16:02:11 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:

> Looks OK to me.  Please merge it via the s390 tree.
> 
> Do other architectures need to fix this?

Thanks Andrew for the quick review. Other architecture might want to
implement this as well, with tick-less the idle numbers in /proc/stat
are just way off. The implementation of the arch_idle_time is not easy
I'm afraid, the sleep time of each cpu needs to be measured in a way
that it can be read from neighbouring cpus (and it should better be a
precise). Not something I would want to have to implement for x86.

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

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