linux-kernel - Re: [RFC] CPUMASK: proposal for replacing cpumask

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Message-ID: <20080911052125.GM7714@one.firstfloor.org>
Date:	Thu, 11 Sep 2008 07:21:26 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Mike Travis <travis@....com>
Cc:	Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	davej@...emonkey.org.uk, David Miller <davem@...emloft.net>,
	Eric Dumazet <dada1@...mosbay.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Jack Steiner <steiner@....com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Jes Sorensen <jes@....com>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: Re: [RFC] CPUMASK: proposal for replacing cpumask_t

On Wed, Sep 10, 2008 at 04:33:16PM -0700, Mike Travis wrote:
> Andi Kleen wrote:
> >> Here's an initial proposal for abstracting cpumask_t to be either
> > 
> > At least for some cases I don't think you'll get around defining
> > a "nearby subset of CPUs that can be handled together" type. Handling 1K 
> > objects all the time in one piece is simply not a good idea.
> > 
> > -Andi
> 
> 
> Every time I stop to think about this, the problems with the cpu
> operators come to mind.  Should there be a separate set?  Or simply
> conversion functions to/from a "cpumask_subset" type?  

A subset would be hopefully enough (set/isset etc.) plus conversion
operators.

-Andi

-- 
ak@...ux.intel.com
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