Subject: Re: [PATCH 3/3] mm: slub: Default slub_max_order to 0
From: James Bottomley <James.Bottomley@HansenPartnership.com>
To: Christoph Lameter <cl@linux.com>
Cc: Dave Jones <davej@redhat.com>, Mel Gorman <mgorman@suse.de>,
        Andrew Morton <akpm@linux-foundation.org>,
        Colin King <colin.king@canonical.com>,
        Raghavendra D Prabhu <raghu.prabhu13@gmail.com>,
        Jan Kara <jack@suse.cz>, Chris Mason <chris.mason@oracle.com>,
        Pekka Enberg <penberg@kernel.org>, Rik van Riel <riel@redhat.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        linux-mm <linux-mm@kvack.org>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        linux-ext4 <linux-ext4@vger.kernel.org>
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Date: Thu, 12 May 2011 11:30:43 -0500
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On Thu, 2011-05-12 at 11:27 -0500, Christoph Lameter wrote:
> On Thu, 12 May 2011, James Bottomley wrote:
> 
> > However, the fact remains that this seems to be a slub problem and it
> > needs fixing.
> 
> Why are you so fixed on slub in these matters?

Because, as has been hashed out in the thread, changing SLUB to SLAB
makes the hang go away.

>  Its an key component but
> there is a high interaction with other subsystems. There was no recent
> change in slub that changed the order of allocations. There were changes
> affecting the reclaim logic. Slub has been working just fine with the
> existing allocation schemes for a long time.

So suggest an alternative root cause and a test to expose it.

James


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