linux-kernel - Re: [patch 02/23] SLUB: Rename NUMA defrag_ratio to remote_node_defrag

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Date:	Thu, 8 Nov 2007 11:16:33 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Matt Mackall <mpm@...enic.com>
cc:	Mel Gorman <mel@...net.ie>, akpm@...ux-foundatin.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [patch 02/23] SLUB: Rename NUMA defrag_ratio to remote_node_defrag_ratio

On Thu, 8 Nov 2007, Matt Mackall wrote:

> > I cannot figure out what the number of cycles currently showing on the TSC
> > have to do with a ratio :(. I could semi-understand if we were counting up
> > how many cycles were being spent trying to pack objects but that does not
> > appear to be the case. The comment didn't help a whole lot either. It felt
> > like a cost for packing, not a ratio
> 
> It's just a random number generator. And a bad one: lots of arches
> return 0. And I believe at least one of them has some NUMA support.

Do we have a better one? Something with minimal processing overhead? I'd 
be glad to switch it.

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