From mboxrd@z Thu Jan 1 00:00:00 1970 Message-Id: <20070221144842.299190000@taijtu.programming.kicks-ass.net> References: <20070221144304.512721000@taijtu.programming.kicks-ass.net> Date: Wed, 21 Feb 2007 15:43:12 +0100 From: Peter Zijlstra Subject: [PATCH 08/29] mm: kmem_cache_objs_to_pages() Content-Disposition: inline; filename=mm-kmem_cache_objs_to_pages.patch Sender: owner-linux-mm@kvack.org Return-Path: To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org Cc: Peter Zijlstra , Trond Myklebust , Thomas Graf , David Miller List-ID: Provide a method to calculate the number of pages needed to store a given number of slab objects (upper bound when considering possible partial and free slabs). Signed-off-by: Peter Zijlstra --- include/linux/slab.h | 1 + mm/slab.c | 6 ++++++ 2 files changed, 7 insertions(+) Index: linux-2.6-git/include/linux/slab.h =================================================================== --- linux-2.6-git.orig/include/linux/slab.h 2007-01-09 11:28:32.000000000 +0100 +++ linux-2.6-git/include/linux/slab.h 2007-01-09 11:30:16.000000000 +0100 @@ -43,6 +43,7 @@ typedef struct kmem_cache kmem_cache_t _ */ void __init kmem_cache_init(void); extern int slab_is_available(void); +extern unsigned int kmem_cache_objs_to_pages(struct kmem_cache *, int); struct kmem_cache *kmem_cache_create(const char *, size_t, size_t, unsigned long, Index: linux-2.6-git/mm/slab.c =================================================================== --- linux-2.6-git.orig/mm/slab.c 2007-01-09 11:30:00.000000000 +0100 +++ linux-2.6-git/mm/slab.c 2007-01-09 11:30:16.000000000 +0100 @@ -4482,3 +4482,9 @@ unsigned int ksize(const void *objp) return obj_size(virt_to_cache(objp)); } + +unsigned int kmem_cache_objs_to_pages(struct kmem_cache *cachep, int nr) +{ + return ((nr + cachep->num - 1) / cachep->num) << cachep->gfporder; +} +EXPORT_SYMBOL_GPL(kmem_cache_objs_to_pages); -- -- 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