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Merge branch 'slab/next' into for-linus

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This commit is contained in:
Pekka Enberg 2011-03-20 18:12:03 +02:00
commit c53badd080
5 changed files with 107 additions and 88 deletions
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1
include/linux/slab.h
View File

@ -105,7 +105,6 @@ void kmem_cache_destroy(struct kmem_cache *);
int kmem_cache_shrink(struct kmem_cache *);
void kmem_cache_free(struct kmem_cache *, void *);
unsigned int kmem_cache_size(struct kmem_cache *);
const char *kmem_cache_name(struct kmem_cache *);
/*
* Please use this macro to create slab caches. Simply specify the

1
include/linux/slub_def.h
View File

@ -83,6 +83,7 @@ struct kmem_cache {
void (*ctor)(void *);
int inuse; /* Offset to metadata */
int align; /* Alignment */
int reserved; /* Reserved bytes at the end of slabs */
unsigned long min_partial;
const char *name; /* Name (only for display!) */
struct list_head list; /* List of slab caches */

55
mm/slab.c
View File

@ -190,22 +190,6 @@ typedef unsigned int kmem_bufctl_t;
#define BUFCTL_ACTIVE (((kmem_bufctl_t)(~0U))-2)
#define SLAB_LIMIT (((kmem_bufctl_t)(~0U))-3)
/*
* struct slab
*
* Manages the objs in a slab. Placed either at the beginning of mem allocated
* for a slab, or allocated from an general cache.
* Slabs are chained into three list: fully used, partial, fully free slabs.
*/
struct slab {
struct list_head list;
unsigned long colouroff;
void *s_mem; /* including colour offset */
unsigned int inuse; /* num of objs active in slab */
kmem_bufctl_t free;
unsigned short nodeid;
};
/*
* struct slab_rcu
*
@ -219,8 +203,6 @@ struct slab {
*
* rcu_read_lock before reading the address, then rcu_read_unlock after
* taking the spinlock within the structure expected at that address.
*
* We assume struct slab_rcu can overlay struct slab when destroying.
*/
struct slab_rcu {
struct rcu_head head;
@ -228,6 +210,27 @@ struct slab_rcu {
void *addr;
};
/*
* struct slab
*
* Manages the objs in a slab. Placed either at the beginning of mem allocated
* for a slab, or allocated from an general cache.
* Slabs are chained into three list: fully used, partial, fully free slabs.
*/
struct slab {
union {
struct {
struct list_head list;
unsigned long colouroff;
void *s_mem; /* including colour offset */
unsigned int inuse; /* num of objs active in slab */
kmem_bufctl_t free;
unsigned short nodeid;
};
struct slab_rcu __slab_cover_slab_rcu;
};
};
/*
* struct array_cache
*
@ -2147,8 +2150,6 @@ static int __init_refok setup_cpu_cache(struct kmem_cache *cachep, gfp_t gfp)
*
* @name must be valid until the cache is destroyed. This implies that
* the module calling this has to destroy the cache before getting unloaded.
* Note that kmem_cache_name() is not guaranteed to return the same pointer,
* therefore applications must manage it themselves.
*
* The flags are
*
@ -2288,8 +2289,8 @@ kmem_cache_create (const char *name, size_t size, size_t align,
if (ralign < align) {
ralign = align;
}
/* disable debug if not aligning with REDZONE_ALIGN */
if (ralign & (__alignof__(unsigned long long) - 1))
/* disable debug if necessary */
if (ralign > __alignof__(unsigned long long))
flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER);
/*
* 4) Store it.
@ -2315,8 +2316,8 @@ kmem_cache_create (const char *name, size_t size, size_t align,
*/
if (flags & SLAB_RED_ZONE) {
/* add space for red zone words */
cachep->obj_offset += align;
size += align + sizeof(unsigned long long);
cachep->obj_offset += sizeof(unsigned long long);
size += 2 * sizeof(unsigned long long);
}
if (flags & SLAB_STORE_USER) {
/* user store requires one word storage behind the end of
@ -3840,12 +3841,6 @@ unsigned int kmem_cache_size(struct kmem_cache *cachep)
}
EXPORT_SYMBOL(kmem_cache_size);
const char *kmem_cache_name(struct kmem_cache *cachep)
{
return cachep->name;
}
EXPORT_SYMBOL_GPL(kmem_cache_name);
/*
* This initializes kmem_list3 or resizes various caches for all nodes.
*/

6
mm/slob.c
View File

@ -666,12 +666,6 @@ unsigned int kmem_cache_size(struct kmem_cache *c)
}
EXPORT_SYMBOL(kmem_cache_size);
const char *kmem_cache_name(struct kmem_cache *c)
{
return c->name;
}
EXPORT_SYMBOL(kmem_cache_name);
int kmem_cache_shrink(struct kmem_cache *d)
{
return 0;

132
mm/slub.c
View File

@ -281,11 +281,40 @@ static inline int slab_index(void *p, struct kmem_cache *s, void *addr)
return (p - addr) / s->size;
}
static inline size_t slab_ksize(const struct kmem_cache *s)
{
#ifdef CONFIG_SLUB_DEBUG
/*
* Debugging requires use of the padding between object
* and whatever may come after it.
*/
if (s->flags & (SLAB_RED_ZONE | SLAB_POISON))
return s->objsize;
#endif
/*
* If we have the need to store the freelist pointer
* back there or track user information then we can
* only use the space before that information.
*/
if (s->flags & (SLAB_DESTROY_BY_RCU | SLAB_STORE_USER))
return s->inuse;
/*
* Else we can use all the padding etc for the allocation
*/
return s->size;
}
static inline int order_objects(int order, unsigned long size, int reserved)
{
return ((PAGE_SIZE << order) - reserved) / size;
}
static inline struct kmem_cache_order_objects oo_make(int order,
unsigned long size)
unsigned long size, int reserved)
{
struct kmem_cache_order_objects x = {
(order << OO_SHIFT) + (PAGE_SIZE << order) / size
(order << OO_SHIFT) + order_objects(order, size, reserved)
};
return x;
@ -617,7 +646,7 @@ static int slab_pad_check(struct kmem_cache *s, struct page *page)
return 1;
start = page_address(page);
length = (PAGE_SIZE << compound_order(page));
length = (PAGE_SIZE << compound_order(page)) - s->reserved;
end = start + length;
remainder = length % s->size;
if (!remainder)
@ -698,7 +727,7 @@ static int check_slab(struct kmem_cache *s, struct page *page)
return 0;
}
maxobj = (PAGE_SIZE << compound_order(page)) / s->size;
maxobj = order_objects(compound_order(page), s->size, s->reserved);
if (page->objects > maxobj) {
slab_err(s, page, "objects %u > max %u",
s->name, page->objects, maxobj);
@ -748,7 +777,7 @@ static int on_freelist(struct kmem_cache *s, struct page *page, void *search)
nr++;
}
max_objects = (PAGE_SIZE << compound_order(page)) / s->size;
max_objects = order_objects(compound_order(page), s->size, s->reserved);
if (max_objects > MAX_OBJS_PER_PAGE)
max_objects = MAX_OBJS_PER_PAGE;
@ -800,7 +829,7 @@ static inline int slab_pre_alloc_hook(struct kmem_cache *s, gfp_t flags)
static inline void slab_post_alloc_hook(struct kmem_cache *s, gfp_t flags, void *object)
{
flags &= gfp_allowed_mask;
kmemcheck_slab_alloc(s, flags, object, s->objsize);
kmemcheck_slab_alloc(s, flags, object, slab_ksize(s));
kmemleak_alloc_recursive(object, s->objsize, 1, s->flags, flags);
}
@ -1249,21 +1278,38 @@ static void __free_slab(struct kmem_cache *s, struct page *page)
__free_pages(page, order);
}
#define need_reserve_slab_rcu \
(sizeof(((struct page *)NULL)->lru) < sizeof(struct rcu_head))
static void rcu_free_slab(struct rcu_head *h)
{
struct page *page;
page = container_of((struct list_head *)h, struct page, lru);
if (need_reserve_slab_rcu)
page = virt_to_head_page(h);
else
page = container_of((struct list_head *)h, struct page, lru);
__free_slab(page->slab, page);
}
static void free_slab(struct kmem_cache *s, struct page *page)
{
if (unlikely(s->flags & SLAB_DESTROY_BY_RCU)) {
/*
* RCU free overloads the RCU head over the LRU
*/
struct rcu_head *head = (void *)&page->lru;
struct rcu_head *head;
if (need_reserve_slab_rcu) {
int order = compound_order(page);
int offset = (PAGE_SIZE << order) - s->reserved;
VM_BUG_ON(s->reserved != sizeof(*head));
head = page_address(page) + offset;
} else {
/*
* RCU free overloads the RCU head over the LRU
*/
head = (void *)&page->lru;
}
call_rcu(head, rcu_free_slab);
} else
@ -1988,13 +2034,13 @@ static int slub_nomerge;
* the smallest order which will fit the object.
*/
static inline int slab_order(int size, int min_objects,
int max_order, int fract_leftover)
int max_order, int fract_leftover, int reserved)
{
int order;
int rem;
int min_order = slub_min_order;
if ((PAGE_SIZE << min_order) / size > MAX_OBJS_PER_PAGE)
if (order_objects(min_order, size, reserved) > MAX_OBJS_PER_PAGE)
return get_order(size * MAX_OBJS_PER_PAGE) - 1;
for (order = max(min_order,
@ -2003,10 +2049,10 @@ static inline int slab_order(int size, int min_objects,
unsigned long slab_size = PAGE_SIZE << order;
if (slab_size < min_objects * size)
if (slab_size < min_objects * size + reserved)
continue;
rem = slab_size % size;
rem = (slab_size - reserved) % size;
if (rem <= slab_size / fract_leftover)
break;
@ -2016,7 +2062,7 @@ static inline int slab_order(int size, int min_objects,
return order;
}
static inline int calculate_order(int size)
static inline int calculate_order(int size, int reserved)
{
int order;
int min_objects;
@ -2034,14 +2080,14 @@ static inline int calculate_order(int size)
min_objects = slub_min_objects;
if (!min_objects)
min_objects = 4 * (fls(nr_cpu_ids) + 1);
max_objects = (PAGE_SIZE << slub_max_order)/size;
max_objects = order_objects(slub_max_order, size, reserved);
min_objects = min(min_objects, max_objects);
while (min_objects > 1) {
fraction = 16;
while (fraction >= 4) {
order = slab_order(size, min_objects,
slub_max_order, fraction);
slub_max_order, fraction, reserved);
if (order <= slub_max_order)
return order;
fraction /= 2;
@ -2053,14 +2099,14 @@ static inline int calculate_order(int size)
* We were unable to place multiple objects in a slab. Now
* lets see if we can place a single object there.
*/
order = slab_order(size, 1, slub_max_order, 1);
order = slab_order(size, 1, slub_max_order, 1, reserved);
if (order <= slub_max_order)
return order;
/*
* Doh this slab cannot be placed using slub_max_order.
*/
order = slab_order(size, 1, MAX_ORDER, 1);
order = slab_order(size, 1, MAX_ORDER, 1, reserved);
if (order < MAX_ORDER)
return order;
return -ENOSYS;
@ -2311,7 +2357,7 @@ static int calculate_sizes(struct kmem_cache *s, int forced_order)
if (forced_order >= 0)
order = forced_order;
else
order = calculate_order(size);
order = calculate_order(size, s->reserved);
if (order < 0)
return 0;
@ -2329,8 +2375,8 @@ static int calculate_sizes(struct kmem_cache *s, int forced_order)
/*
* Determine the number of objects per slab
*/
s->oo = oo_make(order, size);
s->min = oo_make(get_order(size), size);
s->oo = oo_make(order, size, s->reserved);
s->min = oo_make(get_order(size), size, s->reserved);
if (oo_objects(s->oo) > oo_objects(s->max))
s->max = s->oo;
@ -2349,6 +2395,10 @@ static int kmem_cache_open(struct kmem_cache *s,
s->objsize = size;
s->align = align;
s->flags = kmem_cache_flags(size, flags, name, ctor);
s->reserved = 0;
if (need_reserve_slab_rcu && (s->flags & SLAB_DESTROY_BY_RCU))
s->reserved = sizeof(struct rcu_head);
if (!calculate_sizes(s, -1))
goto error;
@ -2399,12 +2449,6 @@ unsigned int kmem_cache_size(struct kmem_cache *s)
}
EXPORT_SYMBOL(kmem_cache_size);
const char *kmem_cache_name(struct kmem_cache *s)
{
return s->name;
}
EXPORT_SYMBOL(kmem_cache_name);
static void list_slab_objects(struct kmem_cache *s, struct page *page,
const char *text)
{
@ -2696,7 +2740,6 @@ EXPORT_SYMBOL(__kmalloc_node);
size_t ksize(const void *object)
{
struct page *page;
struct kmem_cache *s;
if (unlikely(object == ZERO_SIZE_PTR))
return 0;
@ -2707,28 +2750,8 @@ size_t ksize(const void *object)
WARN_ON(!PageCompound(page));
return PAGE_SIZE << compound_order(page);
}
s = page->slab;
#ifdef CONFIG_SLUB_DEBUG
/*
* Debugging requires use of the padding between object
* and whatever may come after it.
*/
if (s->flags & (SLAB_RED_ZONE | SLAB_POISON))
return s->objsize;
#endif
/*
* If we have the need to store the freelist pointer
* back there or track user information then we can
* only use the space before that information.
*/
if (s->flags & (SLAB_DESTROY_BY_RCU | SLAB_STORE_USER))
return s->inuse;
/*
* Else we can use all the padding etc for the allocation
*/
return s->size;
return slab_ksize(page->slab);
}
EXPORT_SYMBOL(ksize);
@ -4017,6 +4040,12 @@ static ssize_t destroy_by_rcu_show(struct kmem_cache *s, char *buf)
}
SLAB_ATTR_RO(destroy_by_rcu);
static ssize_t reserved_show(struct kmem_cache *s, char *buf)
{
return sprintf(buf, "%d\n", s->reserved);
}
SLAB_ATTR_RO(reserved);
#ifdef CONFIG_SLUB_DEBUG
static ssize_t slabs_show(struct kmem_cache *s, char *buf)
{
@ -4303,6 +4332,7 @@ static struct attribute *slab_attrs[] = {
&reclaim_account_attr.attr,
&destroy_by_rcu_attr.attr,
&shrink_attr.attr,
&reserved_attr.attr,
#ifdef CONFIG_SLUB_DEBUG
&total_objects_attr.attr,
&slabs_attr.attr,