linux-kernel - Re: [patch 12/23] SLUB: Trigger defragmentation from memory reclaim

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Message-ID: <Pine.LNX.4.64.0711081059420.8954@schroedinger.engr.sgi.com>
Date:	Thu, 8 Nov 2007 11:00:32 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Mel Gorman <mel@...net.ie>
cc:	akpm@...ux-foundatin.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [patch 12/23] SLUB: Trigger defragmentation from memory reclaim

On Thu, 8 Nov 2007, Mel Gorman wrote:

> >  	up_read(&shrinker_rwsem);
> > +	if (gfp_mask & __GFP_FS)
> > +		kmem_cache_defrag(zone ? zone_to_nid(zone) : -1);
> 
> Does this make an assumption that only filesystem-related slabs may be
> targetted for reclaim? What if there is a slab that can free its objects
> without ever caring about a filesystem?

Correct. Currently only filesystem related slabs support slab defragy.
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