linux-kernel - Re: [patch 01/19] slub: Add defrag

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Message-ID: <20080813004006.GD22793@kroah.com>
Date:	Tue, 12 Aug 2008 17:40:06 -0700
From:	Greg KH <greg@...ah.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Pekka Enberg <penberg@...helsinki.fi>, akpm@...ux-foundation.org,
	Christoph Lameter <clameter@....com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Mel Gorman <mel@...net.ie>, andi@...stfloor.org,
	Rik van Riel <riel@...hat.com>, mpm@...enic.com,
	Dave Chinner <david@...morbit.com>
Subject: Re: [patch 01/19] slub: Add defrag_ratio field and sysfs support.

On Mon, Aug 11, 2008 at 08:06:17AM -0700, Christoph Lameter wrote:
> The defrag_ratio is used to set the threshold at which defragmentation
> should be attempted on a slab page.
> 
> The allocation ratio is measured by the percentage of the available slots
> allocated.
> 
> Add a defrag ratio field and set it to 30% by default. A limit of 30% specified
> that less than 3 out of 10 available slots for objects are in use before
> slab defragmeentation runs.

Any new sysfs file should also add documentation in Documentation/ABI.

Please add that to this patch.

thanks,

greg k-h
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