From: Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: 2.6.26-rc: nfsd hangs for a few sec
Date: Sat, 21 Jun 2008 16:54:47 -0700 (PDT)
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Cc: Mel Gorman <mel-wPRd99KPJ+uzQB+pC5nmwQ@public.gmane.org>,
	Alexander Beregalov <a.beregalov@gmail.com>,
	kernel-testers@vger.kernel.org,
	kernel list <linux-kernel@vger.kernel.org>, linux-mm@kvack.org,
	Lee Schermerhorn <lee.schermerhorn@hp.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu-+CUm20s59erQFUHtdCDX3A@public.gmane.org>,
	Hugh Dickins <hugh-DTz5qymZ9yRBDgjK7y7TUQ@public.gmane.org>,
	Nick Piggin <nickpiggin-/E1597aS9LT0CCvOHzKKcA@public.gmane.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	bfields@fieldses.org, neilb@suse.de, linux-nfs@vger.kernel.org
To: Christoph Lameter <clameter@sgi.com>
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On Sat, 21 Jun 2008, Christoph Lameter wrote:
>
>   Not a direct explanation for the problem but the memory wastage could 
> certainly can heretofore undiscovered locking dependencies to be 
> exposed.

Well, not for these traces, no. The trace contains __slab_alloc() in the 
call chain, which definitely fingers SLUB, not slab, despite the name 
(slab calls its allocation routines "cache_alloc", while slub calls them 
"slab_alloc" ;)

So the patch looks fine, and I applied it, but as Mel already mentioned, 
it looks like it won't be making any difference for Alexander.

		Linus