linux-kernel - Re: 2.6.26-rc: nfsd hangs for a few sec

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Message-ID: <alpine.LFD.1.10.0806211651210.2926@woody.linux-foundation.org>
Date:	Sat, 21 Jun 2008 16:54:47 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Christoph Lameter <clameter@....com>
cc:	Mel Gorman <mel@....ul.ie>,
	Alexander Beregalov <a.beregalov@...il.com>,
	kernel-testers@...r.kernel.org,
	kernel list <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
	Lee Schermerhorn <lee.schermerhorn@...com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Hugh Dickins <hugh@...itas.com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	bfields@...ldses.org, neilb@...e.de, linux-nfs@...r.kernel.org
Subject: Re: 2.6.26-rc: nfsd hangs for a few sec



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
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