linux-kernel - Re: 2.6.22 -mm merge plans: slub

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Message-ID: <20070503082716.GE19966@holomorphy.com>
Date:	Thu, 3 May 2007 01:27:16 -0700
From:	William Lee Irwin III <wli@...omorphy.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Christoph Lameter <clameter@....com>,
	Hugh Dickins <hugh@...itas.com>, haveblue@....com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: 2.6.22 -mm merge plans: slub

On Thu, May 03, 2007 at 01:15:15AM -0700, Andrew Morton wrote:
> That all seems to work as intended.
> However with NR_CPUS=8 SPLIT_PTLOCK_CPUS=4, enabling SLUB=y crashes the
> machine early in boot.  
> Too early for netconsole, no serial console.  Wedges up uselessly with
> CONFIG_XMON=n, does mysterious repeated uncontrollable exceptions with
> CONFIG_XMON=y.  This is all fairly typical for a powerpc/G5 crash :(
> However I was able to glimpse some stuff as it flew past.  Crash started in
> flush_old_exec and ended in pgtable_free_tlb -> kmem_cache_free.  I don't know
> how to do better than that I'm afraid, unless I'm to hunt down a PCIE serial
> card, perhaps.

I've seen this crash in flush_old_exec() before. ISTR it being due to
slub vs. pagetable alignment or something on that order.


-- wli
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