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slab: remove kmem_bufctl_t

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Now, we changed the management method of free objects of the slab and
there is no need to use special value, BUFCTL_END, BUFCTL_FREE and
BUFCTL_ACTIVE. So remove them.

Acked-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Pekka Enberg <penberg@iki.fi>
This commit is contained in:
Joonsoo Kim 2013-10-24 10:07:46 +09:00 committed by Pekka Enberg
parent b1cb0982bd
commit 16025177e1
1 changed files with 11 additions and 31 deletions
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42
mm/slab.c
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@ -163,27 +163,7 @@
*/
static bool pfmemalloc_active __read_mostly;
/*
* kmem_bufctl_t:
*
* Bufctl's are used for linking objs within a slab
* linked offsets.
*
* This implementation relies on "struct page" for locating the cache &
* slab an object belongs to.
* This allows the bufctl structure to be small (one int), but limits
* the number of objects a slab (not a cache) can contain when off-slab
* bufctls are used. The limit is the size of the largest general cache
* that does not use off-slab slabs.
* For 32bit archs with 4 kB pages, is this 56.
* This is not serious, as it is only for large objects, when it is unwise
* to have too many per slab.
* Note: This limit can be raised by introducing a general cache whose size
* is less than 512 (PAGE_SIZE<<3), but greater than 256.
*/
typedef unsigned int kmem_bufctl_t;
#define SLAB_LIMIT (((kmem_bufctl_t)(~0U))-3)
#define SLAB_LIMIT (((unsigned int)(~0U))-1)
/*
* struct slab
@ -197,7 +177,7 @@ struct slab {
struct list_head list;
void *s_mem; /* including colour offset */
unsigned int inuse; /* num of objs active in slab */
kmem_bufctl_t free;
unsigned int free;
};
};
@ -613,7 +593,7 @@ static inline struct array_cache *cpu_cache_get(struct kmem_cache *cachep)
static size_t slab_mgmt_size(size_t nr_objs, size_t align)
{
return ALIGN(sizeof(struct slab)+nr_objs*sizeof(kmem_bufctl_t), align);
return ALIGN(sizeof(struct slab)+nr_objs*sizeof(unsigned int), align);
}
/*
@ -633,7 +613,7 @@ static void cache_estimate(unsigned long gfporder, size_t buffer_size,
* slab is used for:
*
* - The struct slab
* - One kmem_bufctl_t for each object
* - One unsigned int for each object
* - Padding to respect alignment of @align
* - @buffer_size bytes for each object
*
@ -658,7 +638,7 @@ static void cache_estimate(unsigned long gfporder, size_t buffer_size,
* into account.
*/
nr_objs = (slab_size - sizeof(struct slab)) /
(buffer_size + sizeof(kmem_bufctl_t));
(buffer_size + sizeof(unsigned int));
/*
* This calculated number will be either the right
@ -2068,7 +2048,7 @@ static size_t calculate_slab_order(struct kmem_cache *cachep,
* looping condition in cache_grow().
*/
offslab_limit = size - sizeof(struct slab);
offslab_limit /= sizeof(kmem_bufctl_t);
offslab_limit /= sizeof(unsigned int);
if (num > offslab_limit)
break;
@ -2309,7 +2289,7 @@ __kmem_cache_create (struct kmem_cache *cachep, unsigned long flags)
if (!cachep->num)
return -E2BIG;
slab_size = ALIGN(cachep->num * sizeof(kmem_bufctl_t)
slab_size = ALIGN(cachep->num * sizeof(unsigned int)
+ sizeof(struct slab), cachep->align);
/*
@ -2324,7 +2304,7 @@ __kmem_cache_create (struct kmem_cache *cachep, unsigned long flags)
if (flags & CFLGS_OFF_SLAB) {
/* really off slab. No need for manual alignment */
slab_size =
cachep->num * sizeof(kmem_bufctl_t) + sizeof(struct slab);
cachep->num * sizeof(unsigned int) + sizeof(struct slab);
#ifdef CONFIG_PAGE_POISONING
/* If we're going to use the generic kernel_map_pages()
@ -2603,9 +2583,9 @@ static struct slab *alloc_slabmgmt(struct kmem_cache *cachep,
return slabp;
}
static inline kmem_bufctl_t *slab_bufctl(struct slab *slabp)
static inline unsigned int *slab_bufctl(struct slab *slabp)
{
return (kmem_bufctl_t *) (slabp + 1);
return (unsigned int *) (slabp + 1);
}
static void cache_init_objs(struct kmem_cache *cachep,
@ -2684,7 +2664,7 @@ static void slab_put_obj(struct kmem_cache *cachep, struct slab *slabp,
{
unsigned int objnr = obj_to_index(cachep, slabp, objp);
#if DEBUG
kmem_bufctl_t i;
unsigned int i;
/* Verify that the slab belongs to the intended node */
WARN_ON(page_to_nid(virt_to_page(objp)) != nodeid);