From: Pekka Enberg <penberg@cs.helsinki.fi>
To: Mel Gorman <mel@csn.ul.ie>
Cc: Nick Piggin <npiggin@suse.de>,
Christoph Lameter <cl@linux-foundation.org>,
heiko.carstens@de.ibm.com, sachinp@in.ibm.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Tejun Heo <tj@kernel.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: Re: [PATCH 1/4] slqb: Do not use DEFINE_PER_CPU for per-node data
Date: Tue, 22 Sep 2009 21:55:55 +0300 [thread overview]
Message-ID: <84144f020909221155s27facd66rc852f5e6b28eb593@mail.gmail.com> (raw)
In-Reply-To: <1253624054-10882-2-git-send-email-mel@csn.ul.ie>
On Tue, Sep 22, 2009 at 3:54 PM, Mel Gorman <mel@csn.ul.ie> wrote:
> SLQB uses DEFINE_PER_CPU to define per-node areas. An implicit
> assumption is made that all valid node IDs will have matching valid CPU
> ids. In memoryless configurations, it is possible to have a node ID with
> no CPU having the same ID. When this happens, per-cpu areas are not
> initialised and the per-node data is effectively random.
>
> An attempt was made to force the allocation of per-cpu areas corresponding
> to active node IDs. However, for reasons unknown this led to silent
> lockups. Instead, this patch fixes the SLQB problem by forcing the per-node
> data to be statically declared.
>
> Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Applied, thanks!
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next prev parent reply other threads:[~2009-09-22 18:55 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-22 12:54 [PATCH 0/3] Fix SLQB on memoryless configurations V3 Mel Gorman
2009-09-22 12:54 ` [PATCH 1/4] slqb: Do not use DEFINE_PER_CPU for per-node data Mel Gorman
2009-09-22 18:55 ` Pekka Enberg [this message]
2009-09-22 12:54 ` [PATCH 2/4] slqb: Record what node is local to a kmem_cache_cpu Mel Gorman
2009-09-22 13:38 ` Pekka Enberg
2009-09-22 13:54 ` Mel Gorman
2009-09-22 18:54 ` Pekka Enberg
2009-09-22 18:56 ` Mel Gorman
2009-09-30 14:41 ` Mel Gorman
2009-09-30 15:06 ` Christoph Lameter
2009-09-30 22:05 ` Mel Gorman
2009-09-30 23:45 ` Christoph Lameter
2009-10-01 10:40 ` Mel Gorman
2009-10-01 14:32 ` Christoph Lameter
2009-10-01 15:03 ` Mel Gorman
2009-10-01 15:03 ` Christoph Lameter
2009-10-01 15:16 ` Mel Gorman
2009-10-04 12:06 ` Pekka Enberg
2009-10-05 9:49 ` Mel Gorman
2009-09-22 12:54 ` [PATCH 3/4] slqb: Allow SLQB to be used on PPC and S390 Mel Gorman
2009-09-22 13:21 ` [PATCH 0/3] Fix SLQB on memoryless configurations V3 Mel Gorman
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