linux-kernel - Re: [RFC] cpuset: add interface to isolated cpus

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Message-ID: <453750AA.1050803@yahoo.com.au>
Date:	Thu, 19 Oct 2006 20:17:14 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Paul Jackson <pj@....com>
CC:	Andrew Morton <akpm@...l.org>, Martin Bligh <mbligh@...gle.com>,
	Paul Menage <menage@...gle.com>, Simon.Derr@...l.net,
	linux-kernel@...r.kernel.org,
	Dinakar Guniguntala <dino@...ibm.com>,
	Rohit Seth <rohitseth@...gle.com>, Robin Holt <holt@....com>,
	dipankar@...ibm.com, "Siddha, Suresh B" <suresh.b.siddha@...el.com>
Subject: Re: [RFC] cpuset: add interface to isolated cpus

Paul Jackson wrote:
> From: Paul Jackson <pj@....com>
> 
> Enable user code to isolate CPUs on a system from the domains that
> determine scheduler load balancing.
> 
> This is already doable using the boot parameter "isolcpus=".  The folks
> running realtime code on production systems, where some nodes are
> isolated for realtime, and some not, and where it is unacceptable
> to reboot to adjust this, need to be able to change which CPUs are
> isolated from the scheduler balancing code on the fly.
> 
> This is done by exposing the kernels cpu_isolated_map as a cpumask
> in the root cpuset directory, in a file called 'isolated_cpus',
> where it can be read and written by sufficiently privileged user code.

This should be done outside cpusets.

-- 
SUSE Labs, Novell Inc.
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