From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail137.messagelabs.com (mail137.messagelabs.com [216.82.249.19]) by kanga.kvack.org (Postfix) with SMTP id EF45D600385 for ; Thu, 27 May 2010 10:20:37 -0400 (EDT) Date: Thu, 27 May 2010 09:17:17 -0500 (CDT) From: Christoph Lameter Subject: Re: [BUG] slub crashes on dma allocations In-Reply-To: <20100526153757.GB2232@osiris.boeblingen.de.ibm.com> Message-ID: References: <20100526153757.GB2232@osiris.boeblingen.de.ibm.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org To: Heiko Carstens Cc: Pekka Enberg , linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: So S390 has NUMA and the minalign is allowing very small slabs of 8/16/32 bytes? Try this patch From: Christoph Lameter 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 --- 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org