From: Christoph Lameter <cl@linux-foundation.org>
To: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [BUG] slub crashes on dma allocations
Date: Thu, 27 May 2010 09:17:17 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.00.1005270916220.5762@router.home> (raw)
In-Reply-To: <20100526153757.GB2232@osiris.boeblingen.de.ibm.com>
So S390 has NUMA and the minalign is allowing very small slabs of 8/16/32 bytes?
Try this patch
From: Christoph Lameter <cl@linux-foundation.org>
Subject: SLUB: Allow full duplication of kmalloc array for 390
Seems that S390 is running out of kmalloc caches.
Increase the number of kmalloc caches to a safe size.
Signed-off-by: Christoph Lameter <cl@linux-foundation.org>
---
include/linux/slub_def.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Index: linux-2.6/include/linux/slub_def.h
===================================================================
--- linux-2.6.orig/include/linux/slub_def.h 2010-05-27 09:14:16.000000000 -0500
+++ linux-2.6/include/linux/slub_def.h 2010-05-27 09:14:26.000000000 -0500
@@ -140,7 +140,7 @@ struct kmem_cache {
#ifdef CONFIG_ZONE_DMA
#define SLUB_DMA __GFP_DMA
/* Reserve extra caches for potential DMA use */
-#define KMALLOC_CACHES (2 * SLUB_PAGE_SHIFT - 6)
+#define KMALLOC_CACHES (2 * SLUB_PAGE_SHIFT)
#else
/* Disable DMA functionality */
#define SLUB_DMA (__force gfp_t)0
--
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next prev parent reply other threads:[~2010-05-27 14:20 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-26 15:37 Heiko Carstens
2010-05-27 14:17 ` Christoph Lameter [this message]
2010-05-27 19:04 ` Heiko Carstens
2010-05-30 10:05 ` Pekka Enberg
2010-06-01 13:44 ` Christoph Lameter
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