linux-kernel - Re: [RFC/PATCH] cpuset: cpuset irq affinities

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Message-ID: <47CDA885.3000103@qualcomm.com>
Date:	Tue, 04 Mar 2008 11:52:37 -0800
From:	Max Krasnyanskiy <maxk@...lcomm.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Paul Jackson <pj@....com>, mingo@...e.hu, tglx@...utronix.de,
	oleg@...sign.ru, rostedt@...dmis.org, linux-kernel@...r.kernel.org,
	rientjes@...gle.com
Subject: Re: [RFC/PATCH] cpuset: cpuset irq affinities

Peter Zijlstra wrote:
> On Tue, 2008-03-04 at 01:35 -0600, Paul Jackson wrote:
>> Peter wrote:
>>> OK, understood, I'll try and come up with yet another scheme :-)
>> Would your per-cpuset 'irqs' file work if, unlike pids in the 'tasks' file,
>> we allowed the same irq to be listed in multiple 'irqs' files?
> 
> I did think of that, but that seems rather awkward. For one, how would
> you remove an irq from a cpuset?
> 
> Secondly, the beauty of the current solution is that we use
> irq_desc->cs->cpus_allowed, if it were in multiple sets, we'd have to
> iterate a list, and cpus_or() the bunch.
> 
Yeah, that would definitely be awkward.

Max
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