linux-kernel - Re: [RFC/PATCH] Add sysfs control to modify a user's cpu share

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Message-ID: <20071001161221.GB23969@redhat.com>
Date:	Mon, 1 Oct 2007 12:12:21 -0400
From:	Dave Jones <davej@...hat.com>
To:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	lkml <linux-kernel@...r.kernel.org>, maneesh@...ux.vnet.ibm.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sudhir Kumar <skumar@...ux.vnet.ibm.com>
Subject: Re: [RFC/PATCH] Add sysfs control to modify a user's cpu share

On Mon, Oct 01, 2007 at 07:34:54PM +0530, Dhaval Giani wrote:
 > Hi Ingo,
 > 
 > Adds tunables in sysfs to modify a user's cpu share.
 > 
 > A directory is created in sysfs for each new user in the system.
 > 
 > 	/sys/kernel/uids/<uid>/cpu_share
 > 
 > Reading this file returns the cpu shares granted for the user.
 > Writing into this file modifies the cpu share for the user. Only an 
 > administrator is allowed to modify a user's cpu share.
 > 
 > Ex: 
 > 	# cd /sys/kernel/uids/
 > 	# cat 512/cpu_share
 > 	1024
 > 	# echo 2048 > 512/cpu_share
 > 	# cat 512/cpu_share
 > 	2048
 > 	#

Can we start adding stuff to Documentation/ for new files created
in sysfs ?  There's so much undocumented stuff in there now that
it's unfunny.

A great start would be 'wtf is a cpu_share and why would I want to
change it' ?

	Dave

-- 
http://www.codemonkey.org.uk
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