[PATCH 08/29] mm: kmem_cache_objs_to_pages()
From: Peter Zijlstra <hidden>
Date: 2007-02-21 15:33:18
Also in:
linux-mm, lkml
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 <redacted> --- 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);
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