[PATCH 08/29] mm: kmem_cache_objs_to_pages()

[Peter Zijlstra <a.p.zijlstra@chello.nl>]

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 <a.p.zijlstra@chello.nl>
---
 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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