linux-kernel - Re: [RFC] bitmap relative operator for mempolicy extensions

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Message-Id: <200802142102.41420.ak@suse.de>
Date:	Thu, 14 Feb 2008 21:02:41 +0100
From:	Andi Kleen <ak@...e.de>
To:	Christoph Lameter <clameter@....com>
Cc:	Paul Jackson <pj@....com>, David Rientjes <rientjes@...gle.com>,
	Lee.Schermerhorn@...com, mel@....ul.ie,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	travis@....com
Subject: Re: [RFC] bitmap relative operator for mempolicy extensions

On Thursday 14 February 2008 20:27:59 Christoph Lameter wrote:
> Excellent. Relative node masks are a nice feature and may allow us to even 
> cut down the size of the bitmasks for configurations with large numbers of 
> nodes.
> 
> Reviewed-by: Christoph Lameter <clameter@....com>
> 
> ccing Mike since he may need something similar for cpu masks which are 
> getting a bit too large for 4k systems on x86_64.

You're saying the kernel should use these relative masks internally?

That means it would be impossible to run workloads that use the complete
machine because you couldn't represent all nodes.

Doesn't sound like a good idea.

-Andi

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