Message-ID: <48A449F9.8010903@linux-foundation.org>
Date: Thu, 14 Aug 2008 10:06:33 -0500
From: Christoph Lameter <cl@linux-foundation.org>
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To: Pekka Enberg <penberg@cs.helsinki.fi>
CC: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
       KOSAKI Motohiro <m-kosaki@ceres.dti.ne.jp>,
       Matthew Wilcox <matthew@wil.cx>, akpm@linux-foundation.org,
       linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
       Mel Gorman <mel@skynet.ie>, andi@firstfloor.org,
       Rik van Riel <riel@redhat.com>
Subject: Re: No, really, stop trying to delete slab until you've finished
 making slub perform as well
References: <20080805210125.A897.KOSAKI.MOTOHIRO@jp.fujitsu.com> <48986AC6.5030406@linux-foundation.org> <20080813194222.E77F.KOSAKI.MOTOHIRO@jp.fujitsu.com> <48A2DD2C.3090602@linux-foundation.org> <48A3DBAC.6010109@cs.helsinki.fi>
In-Reply-To: <48A3DBAC.6010109@cs.helsinki.fi>
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Pekka Enberg wrote:
>
> This patch hard locks  on my 2-way 64-bit x86 machine (sysrq doesn't 
> respond) when I run hackbench.
At that point we take the listlock and then the slab lock which is a 
lock inversion if we do not use a trylock here. Crap.

Hmmm.. The code already goes to the next slab if an earlier one is 
already locked. So I do not see how the large partial lists could be 
generated.


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