linux-kernel - Re: [PATCH 7/7] CPU controller V1

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Message-Id: <1156326208.6265.33.camel@Homer.simpson.net>
Date:	Wed, 23 Aug 2006 09:43:28 +0000
From:	Mike Galbraith <efault@....de>
To:	vatsa@...ibm.com
Cc:	Ingo Molnar <mingo@...e.hu>, Nick Piggin <nickpiggin@...oo.com.au>,
	Sam Vilain <sam@...ain.net>, linux-kernel@...r.kernel.org,
	Kirill Korotaev <dev@...nvz.org>,
	Balbir Singh <balbir@...ibm.com>, sekharan@...ibm.com,
	Andrew Morton <akpm@...l.org>, nagar@...son.ibm.com,
	matthltc@...ibm.com, dipankar@...ibm.com
Subject: Re: [PATCH 7/7] CPU controller V1 - (temporary) cpuset interface

On Sun, 2006-08-20 at 23:18 +0530, Srivatsa Vaddagiri wrote:

> As an example, follow these steps to create metered cpusets:
> 
> 
> 	# cd /dev
> 	# mkdir cpuset
> 	# mount -t cpuset cpuset cpuset
> 	# cd cpuset
> 	# mkdir grp_a
> 	# cd grp_a
> 	# /bin/echo "6-7" > cpus	# assign CPUs 6,7 for this cpuset
> 	# /bin/echo 0 > mems		# assign node 0 for this cpuset
> 	# /bin/echo 1 > cpu_exclusive
> 	# /bin/echo 1 > meter_cpu

Implementation might need some idiot proofing.

After mount/cd cpuset, somebody might think "gee, why should I need to
create a group 'all', when it's right there in the root, including all
it's tasks?  I'll just set cpu_exclusive, set meter_cpu...

...and after my box finishes rebooting, I'll alert the developer of this
patch set that very bad things happen the instant you do that :)

	-Mike

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