Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161381AbWJSKRX (ORCPT ); Thu, 19 Oct 2006 06:17:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1161383AbWJSKRX (ORCPT ); Thu, 19 Oct 2006 06:17:23 -0400 Received: from smtp105.mail.mud.yahoo.com ([209.191.85.215]:20834 "HELO smtp105.mail.mud.yahoo.com") by vger.kernel.org with SMTP id S1161381AbWJSKRV (ORCPT ); Thu, 19 Oct 2006 06:17:21 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com.au; h=Received:Message-ID:Date:From:User-Agent:X-Accept-Language:MIME-Version:To:CC:Subject:References:In-Reply-To:Content-Type:Content-Transfer-Encoding; b=hwh+8w3hKyq4/m/CoYIUBwux4Yzmbushmwl2RgoKBgk0JuNw0PUxztJHzO48ihTry8U+04GMbmqrRvToNflVhp3sxCg5NHejCDKfoNjUvNbHIDfkB8FYhpX6BZ0vz+URX+v76u8iVR9KHeTLeCUWgwkLlZUizPCw+MAR1R39P5c= ; Message-ID: <453750AA.1050803@yahoo.com.au> Date: Thu, 19 Oct 2006 20:17:14 +1000 From: Nick Piggin User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.12) Gecko/20051007 Debian/1.7.12-1 X-Accept-Language: en MIME-Version: 1.0 To: Paul Jackson CC: Andrew Morton , Martin Bligh , Paul Menage , Simon.Derr@bull.net, linux-kernel@vger.kernel.org, Dinakar Guniguntala , Rohit Seth , Robin Holt , dipankar@in.ibm.com, "Siddha, Suresh B" Subject: Re: [RFC] cpuset: add interface to isolated cpus References: <20061019092607.17547.68979.sendpatchset@sam.engr.sgi.com> In-Reply-To: <20061019092607.17547.68979.sendpatchset@sam.engr.sgi.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1100 Lines: 26 Paul Jackson wrote: > From: Paul Jackson > > 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. Send instant messages to your online friends http://au.messenger.yahoo.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/