From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Tue, 8 May 2007 09:12:58 -0700 (PDT) From: Christoph Lameter Subject: Re: SLUB: Reduce antifrag max order In-Reply-To: Message-ID: References: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Mel Gorman Cc: akpm@linux-foundation.org, linux-mm@kvack.org List-ID: On Tue, 8 May 2007, Mel Gorman wrote: > Anti-frag still depends on reclaim to take place and I imagine you have not > altered min_free_kbytes to keep pages free. Also, I don't think kswapd is > currently making any effort to keep blocks free at a known desired order > although I'm cc'ing Andy Whitcroft to confirm. As the kernel gives up easily > when order > PAGE_ALLOC_COSTLY_ORDER, prehaps you should be using > PAGE_ALLOC_COSTLY_ORDER instead of DEFAULT_ANTIFRAG_MAX_ORDER for SLUB. Ok. So we need this one. Signed-off-by: Christoph Lameter --- mm/slub.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: slub/mm/slub.c =================================================================== --- slub.orig/mm/slub.c 2007-05-08 09:10:54.000000000 -0700 +++ slub/mm/slub.c 2007-05-08 09:11:15.000000000 -0700 @@ -153,7 +153,7 @@ static inline void ClearSlabDebug(struct * If antifragmentation methods are in effect then increase the * slab sizes to increase performance */ -#define DEFAULT_ANTIFRAG_MAX_ORDER 3 +#define DEFAULT_ANTIFRAG_MAX_ORDER PAGE_ALLOC_COSTLY_ORDER #define DEFAULT_ANTIFRAG_MIN_OBJECTS 16 /* -- 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