linux-kernel - Re: RFC: THE OFFLINE SCHEDULER

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Message-ID: <4A96B997.1070001@nortel.com>
Date:	Thu, 27 Aug 2009 10:51:35 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	raz ben yehuda <raziebe@...il.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux-foundation.org>, mingo@...e.hu,
	peterz@...radead.org, maximlevitsky@...il.com, efault@....de,
	riel@...hat.com, wiseman@...s.biu.ac.il,
	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org
Subject: Re: RFC: THE OFFLINE SCHEDULER

On 08/26/2009 03:37 PM, raz ben yehuda wrote:
> 
> On Wed, 2009-08-26 at 15:15 -0600, Chris Friesen wrote:

>> We gave it as close to a whole cpu as we could using cpu and irq
>> affinity and we used message queues in shared memory to allow another
>> cpu to handle I/O.  In our case we still had kernel threads running on
>> the app cpu, but if we'd had a straightforward way to avoid them we
>> would have used it.

> Chris. I offer myself to help anyone wishes to apply OFFSCHED.

I just went and read the docs.  One of the things I noticed is that it
says that the offlined cpu cannot run userspace tasks.  For our
situation that's a showstopper, unfortunately.

Chris

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