Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6: slub: Dont define useless label in the !CONFIG_CMPXCHG_LOCAL case slab,rcu: don't assume the size of struct rcu_head slub,rcu: don't assume the size of struct rcu_head slub: automatically reserve bytes at the end of slab Lockless (and preemptless) fastpaths for slub slub: Get rid of slab_free_hook_irq() slub: min_partial needs to be in first cacheline slub: fix ksize() build error slub: fix kmemcheck calls to match ksize() hints Revert "slab: Fix missing DEBUG_SLAB last user" mm: Remove support for kmem_cache_name()
This commit is contained in:
Linus Torvalds
commit
14577beb82
5 changed files with 333 additions and 103 deletions
|
|
@ -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
|
||||
|
|
|
|||
|
|
@ -35,7 +35,10 @@ enum stat_item {
|
|||
NR_SLUB_STAT_ITEMS };
|
||||
|
||||
struct kmem_cache_cpu {
|
||||
void **freelist; /* Pointer to first free per cpu object */
|
||||
void **freelist; /* Pointer to next available object */
|
||||
#ifdef CONFIG_CMPXCHG_LOCAL
|
||||
unsigned long tid; /* Globally unique transaction id */
|
||||
#endif
|
||||
struct page *page; /* The slab from which we are allocating */
|
||||
int node; /* The node of the page (or -1 for debug) */
|
||||
#ifdef CONFIG_SLUB_STATS
|
||||
|
|
@ -70,6 +73,7 @@ struct kmem_cache {
|
|||
struct kmem_cache_cpu __percpu *cpu_slab;
|
||||
/* Used for retriving partial slabs etc */
|
||||
unsigned long flags;
|
||||
unsigned long min_partial;
|
||||
int size; /* The size of an object including meta data */
|
||||
int objsize; /* The size of an object without meta data */
|
||||
int offset; /* Free pointer offset. */
|
||||
|
|
@ -83,7 +87,7 @@ struct kmem_cache {
|
|||
void (*ctor)(void *);
|
||||
int inuse; /* Offset to metadata */
|
||||
int align; /* Alignment */
|
||||
unsigned long min_partial;
|
||||
int reserved; /* Reserved bytes at the end of slabs */
|
||||
const char *name; /* Name (only for display!) */
|
||||
struct list_head list; /* List of slab caches */
|
||||
#ifdef CONFIG_SYSFS
|
||||
|
|
|
|||
55
mm/slab.c
55
mm/slab.c
|
|
@ -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.
|
||||
*/
|
||||
|
|
|
|||
|
|
@ -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;
|
||||
|
|
|
|||
366
mm/slub.c
366
mm/slub.c
|
|
@ -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;
|
||||
|
||||
|
|
@ -800,21 +829,31 @@ 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);
|
||||
}
|
||||
|
||||
static inline void slab_free_hook(struct kmem_cache *s, void *x)
|
||||
{
|
||||
kmemleak_free_recursive(x, s->flags);
|
||||
}
|
||||
|
||||
static inline void slab_free_hook_irq(struct kmem_cache *s, void *object)
|
||||
{
|
||||
kmemcheck_slab_free(s, object, s->objsize);
|
||||
debug_check_no_locks_freed(object, s->objsize);
|
||||
if (!(s->flags & SLAB_DEBUG_OBJECTS))
|
||||
debug_check_no_obj_freed(object, s->objsize);
|
||||
/*
|
||||
* Trouble is that we may no longer disable interupts in the fast path
|
||||
* So in order to make the debug calls that expect irqs to be
|
||||
* disabled we need to disable interrupts temporarily.
|
||||
*/
|
||||
#if defined(CONFIG_KMEMCHECK) || defined(CONFIG_LOCKDEP)
|
||||
{
|
||||
unsigned long flags;
|
||||
|
||||
local_irq_save(flags);
|
||||
kmemcheck_slab_free(s, x, s->objsize);
|
||||
debug_check_no_locks_freed(x, s->objsize);
|
||||
if (!(s->flags & SLAB_DEBUG_OBJECTS))
|
||||
debug_check_no_obj_freed(x, s->objsize);
|
||||
local_irq_restore(flags);
|
||||
}
|
||||
#endif
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -1101,9 +1140,6 @@ static inline void slab_post_alloc_hook(struct kmem_cache *s, gfp_t flags,
|
|||
|
||||
static inline void slab_free_hook(struct kmem_cache *s, void *x) {}
|
||||
|
||||
static inline void slab_free_hook_irq(struct kmem_cache *s,
|
||||
void *object) {}
|
||||
|
||||
#endif /* CONFIG_SLUB_DEBUG */
|
||||
|
||||
/*
|
||||
|
|
@ -1249,21 +1285,38 @@ 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
|
||||
|
|
@ -1487,6 +1540,77 @@ static void unfreeze_slab(struct kmem_cache *s, struct page *page, int tail)
|
|||
}
|
||||
}
|
||||
|
||||
#ifdef CONFIG_CMPXCHG_LOCAL
|
||||
#ifdef CONFIG_PREEMPT
|
||||
/*
|
||||
* Calculate the next globally unique transaction for disambiguiation
|
||||
* during cmpxchg. The transactions start with the cpu number and are then
|
||||
* incremented by CONFIG_NR_CPUS.
|
||||
*/
|
||||
#define TID_STEP roundup_pow_of_two(CONFIG_NR_CPUS)
|
||||
#else
|
||||
/*
|
||||
* No preemption supported therefore also no need to check for
|
||||
* different cpus.
|
||||
*/
|
||||
#define TID_STEP 1
|
||||
#endif
|
||||
|
||||
static inline unsigned long next_tid(unsigned long tid)
|
||||
{
|
||||
return tid + TID_STEP;
|
||||
}
|
||||
|
||||
static inline unsigned int tid_to_cpu(unsigned long tid)
|
||||
{
|
||||
return tid % TID_STEP;
|
||||
}
|
||||
|
||||
static inline unsigned long tid_to_event(unsigned long tid)
|
||||
{
|
||||
return tid / TID_STEP;
|
||||
}
|
||||
|
||||
static inline unsigned int init_tid(int cpu)
|
||||
{
|
||||
return cpu;
|
||||
}
|
||||
|
||||
static inline void note_cmpxchg_failure(const char *n,
|
||||
const struct kmem_cache *s, unsigned long tid)
|
||||
{
|
||||
#ifdef SLUB_DEBUG_CMPXCHG
|
||||
unsigned long actual_tid = __this_cpu_read(s->cpu_slab->tid);
|
||||
|
||||
printk(KERN_INFO "%s %s: cmpxchg redo ", n, s->name);
|
||||
|
||||
#ifdef CONFIG_PREEMPT
|
||||
if (tid_to_cpu(tid) != tid_to_cpu(actual_tid))
|
||||
printk("due to cpu change %d -> %d\n",
|
||||
tid_to_cpu(tid), tid_to_cpu(actual_tid));
|
||||
else
|
||||
#endif
|
||||
if (tid_to_event(tid) != tid_to_event(actual_tid))
|
||||
printk("due to cpu running other code. Event %ld->%ld\n",
|
||||
tid_to_event(tid), tid_to_event(actual_tid));
|
||||
else
|
||||
printk("for unknown reason: actual=%lx was=%lx target=%lx\n",
|
||||
actual_tid, tid, next_tid(tid));
|
||||
#endif
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
void init_kmem_cache_cpus(struct kmem_cache *s)
|
||||
{
|
||||
#if defined(CONFIG_CMPXCHG_LOCAL) && defined(CONFIG_PREEMPT)
|
||||
int cpu;
|
||||
|
||||
for_each_possible_cpu(cpu)
|
||||
per_cpu_ptr(s->cpu_slab, cpu)->tid = init_tid(cpu);
|
||||
#endif
|
||||
|
||||
}
|
||||
/*
|
||||
* Remove the cpu slab
|
||||
*/
|
||||
|
|
@ -1518,6 +1642,9 @@ static void deactivate_slab(struct kmem_cache *s, struct kmem_cache_cpu *c)
|
|||
page->inuse--;
|
||||
}
|
||||
c->page = NULL;
|
||||
#ifdef CONFIG_CMPXCHG_LOCAL
|
||||
c->tid = next_tid(c->tid);
|
||||
#endif
|
||||
unfreeze_slab(s, page, tail);
|
||||
}
|
||||
|
||||
|
|
@ -1652,6 +1779,19 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
|
|||
{
|
||||
void **object;
|
||||
struct page *new;
|
||||
#ifdef CONFIG_CMPXCHG_LOCAL
|
||||
unsigned long flags;
|
||||
|
||||
local_irq_save(flags);
|
||||
#ifdef CONFIG_PREEMPT
|
||||
/*
|
||||
* We may have been preempted and rescheduled on a different
|
||||
* cpu before disabling interrupts. Need to reload cpu area
|
||||
* pointer.
|
||||
*/
|
||||
c = this_cpu_ptr(s->cpu_slab);
|
||||
#endif
|
||||
#endif
|
||||
|
||||
/* We handle __GFP_ZERO in the caller */
|
||||
gfpflags &= ~__GFP_ZERO;
|
||||
|
|
@ -1678,6 +1818,10 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
|
|||
c->node = page_to_nid(c->page);
|
||||
unlock_out:
|
||||
slab_unlock(c->page);
|
||||
#ifdef CONFIG_CMPXCHG_LOCAL
|
||||
c->tid = next_tid(c->tid);
|
||||
local_irq_restore(flags);
|
||||
#endif
|
||||
stat(s, ALLOC_SLOWPATH);
|
||||
return object;
|
||||
|
||||
|
|
@ -1739,23 +1883,76 @@ static __always_inline void *slab_alloc(struct kmem_cache *s,
|
|||
{
|
||||
void **object;
|
||||
struct kmem_cache_cpu *c;
|
||||
#ifdef CONFIG_CMPXCHG_LOCAL
|
||||
unsigned long tid;
|
||||
#else
|
||||
unsigned long flags;
|
||||
#endif
|
||||
|
||||
if (slab_pre_alloc_hook(s, gfpflags))
|
||||
return NULL;
|
||||
|
||||
#ifndef CONFIG_CMPXCHG_LOCAL
|
||||
local_irq_save(flags);
|
||||
#else
|
||||
redo:
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Must read kmem_cache cpu data via this cpu ptr. Preemption is
|
||||
* enabled. We may switch back and forth between cpus while
|
||||
* reading from one cpu area. That does not matter as long
|
||||
* as we end up on the original cpu again when doing the cmpxchg.
|
||||
*/
|
||||
c = __this_cpu_ptr(s->cpu_slab);
|
||||
|
||||
#ifdef CONFIG_CMPXCHG_LOCAL
|
||||
/*
|
||||
* The transaction ids are globally unique per cpu and per operation on
|
||||
* a per cpu queue. Thus they can be guarantee that the cmpxchg_double
|
||||
* occurs on the right processor and that there was no operation on the
|
||||
* linked list in between.
|
||||
*/
|
||||
tid = c->tid;
|
||||
barrier();
|
||||
#endif
|
||||
|
||||
object = c->freelist;
|
||||
if (unlikely(!object || !node_match(c, node)))
|
||||
|
||||
object = __slab_alloc(s, gfpflags, node, addr, c);
|
||||
|
||||
else {
|
||||
#ifdef CONFIG_CMPXCHG_LOCAL
|
||||
/*
|
||||
* The cmpxchg will only match if there was no additonal
|
||||
* operation and if we are on the right processor.
|
||||
*
|
||||
* The cmpxchg does the following atomically (without lock semantics!)
|
||||
* 1. Relocate first pointer to the current per cpu area.
|
||||
* 2. Verify that tid and freelist have not been changed
|
||||
* 3. If they were not changed replace tid and freelist
|
||||
*
|
||||
* Since this is without lock semantics the protection is only against
|
||||
* code executing on this cpu *not* from access by other cpus.
|
||||
*/
|
||||
if (unlikely(!this_cpu_cmpxchg_double(
|
||||
s->cpu_slab->freelist, s->cpu_slab->tid,
|
||||
object, tid,
|
||||
get_freepointer(s, object), next_tid(tid)))) {
|
||||
|
||||
note_cmpxchg_failure("slab_alloc", s, tid);
|
||||
goto redo;
|
||||
}
|
||||
#else
|
||||
c->freelist = get_freepointer(s, object);
|
||||
#endif
|
||||
stat(s, ALLOC_FASTPATH);
|
||||
}
|
||||
|
||||
#ifndef CONFIG_CMPXCHG_LOCAL
|
||||
local_irq_restore(flags);
|
||||
#endif
|
||||
|
||||
if (unlikely(gfpflags & __GFP_ZERO) && object)
|
||||
memset(object, 0, s->objsize);
|
||||
|
|
@ -1833,9 +2030,13 @@ static void __slab_free(struct kmem_cache *s, struct page *page,
|
|||
{
|
||||
void *prior;
|
||||
void **object = (void *)x;
|
||||
#ifdef CONFIG_CMPXCHG_LOCAL
|
||||
unsigned long flags;
|
||||
|
||||
stat(s, FREE_SLOWPATH);
|
||||
local_irq_save(flags);
|
||||
#endif
|
||||
slab_lock(page);
|
||||
stat(s, FREE_SLOWPATH);
|
||||
|
||||
if (kmem_cache_debug(s))
|
||||
goto debug;
|
||||
|
|
@ -1865,6 +2066,9 @@ static void __slab_free(struct kmem_cache *s, struct page *page,
|
|||
|
||||
out_unlock:
|
||||
slab_unlock(page);
|
||||
#ifdef CONFIG_CMPXCHG_LOCAL
|
||||
local_irq_restore(flags);
|
||||
#endif
|
||||
return;
|
||||
|
||||
slab_empty:
|
||||
|
|
@ -1876,6 +2080,9 @@ static void __slab_free(struct kmem_cache *s, struct page *page,
|
|||
stat(s, FREE_REMOVE_PARTIAL);
|
||||
}
|
||||
slab_unlock(page);
|
||||
#ifdef CONFIG_CMPXCHG_LOCAL
|
||||
local_irq_restore(flags);
|
||||
#endif
|
||||
stat(s, FREE_SLAB);
|
||||
discard_slab(s, page);
|
||||
return;
|
||||
|
|
@ -1902,23 +2109,56 @@ static __always_inline void slab_free(struct kmem_cache *s,
|
|||
{
|
||||
void **object = (void *)x;
|
||||
struct kmem_cache_cpu *c;
|
||||
#ifdef CONFIG_CMPXCHG_LOCAL
|
||||
unsigned long tid;
|
||||
#else
|
||||
unsigned long flags;
|
||||
#endif
|
||||
|
||||
slab_free_hook(s, x);
|
||||
|
||||
#ifndef CONFIG_CMPXCHG_LOCAL
|
||||
local_irq_save(flags);
|
||||
|
||||
#else
|
||||
redo:
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Determine the currently cpus per cpu slab.
|
||||
* The cpu may change afterward. However that does not matter since
|
||||
* data is retrieved via this pointer. If we are on the same cpu
|
||||
* during the cmpxchg then the free will succedd.
|
||||
*/
|
||||
c = __this_cpu_ptr(s->cpu_slab);
|
||||
|
||||
slab_free_hook_irq(s, x);
|
||||
#ifdef CONFIG_CMPXCHG_LOCAL
|
||||
tid = c->tid;
|
||||
barrier();
|
||||
#endif
|
||||
|
||||
if (likely(page == c->page && c->node != NUMA_NO_NODE)) {
|
||||
set_freepointer(s, object, c->freelist);
|
||||
|
||||
#ifdef CONFIG_CMPXCHG_LOCAL
|
||||
if (unlikely(!this_cpu_cmpxchg_double(
|
||||
s->cpu_slab->freelist, s->cpu_slab->tid,
|
||||
c->freelist, tid,
|
||||
object, next_tid(tid)))) {
|
||||
|
||||
note_cmpxchg_failure("slab_free", s, tid);
|
||||
goto redo;
|
||||
}
|
||||
#else
|
||||
c->freelist = object;
|
||||
#endif
|
||||
stat(s, FREE_FASTPATH);
|
||||
} else
|
||||
__slab_free(s, page, x, addr);
|
||||
|
||||
#ifndef CONFIG_CMPXCHG_LOCAL
|
||||
local_irq_restore(flags);
|
||||
#endif
|
||||
}
|
||||
|
||||
void kmem_cache_free(struct kmem_cache *s, void *x)
|
||||
|
|
@ -1988,13 +2228,13 @@ 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 +2243,10 @@ 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 +2256,7 @@ 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 +2274,14 @@ 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 +2293,14 @@ 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;
|
||||
|
|
@ -2110,9 +2350,23 @@ static inline int alloc_kmem_cache_cpus(struct kmem_cache *s)
|
|||
BUILD_BUG_ON(PERCPU_DYNAMIC_EARLY_SIZE <
|
||||
SLUB_PAGE_SHIFT * sizeof(struct kmem_cache_cpu));
|
||||
|
||||
#ifdef CONFIG_CMPXCHG_LOCAL
|
||||
/*
|
||||
* Must align to double word boundary for the double cmpxchg instructions
|
||||
* to work.
|
||||
*/
|
||||
s->cpu_slab = __alloc_percpu(sizeof(struct kmem_cache_cpu), 2 * sizeof(void *));
|
||||
#else
|
||||
/* Regular alignment is sufficient */
|
||||
s->cpu_slab = alloc_percpu(struct kmem_cache_cpu);
|
||||
#endif
|
||||
|
||||
return s->cpu_slab != NULL;
|
||||
if (!s->cpu_slab)
|
||||
return 0;
|
||||
|
||||
init_kmem_cache_cpus(s);
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
static struct kmem_cache *kmem_cache_node;
|
||||
|
|
@ -2311,7 +2565,7 @@ 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 +2583,8 @@ 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 +2603,10 @@ 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 +2657,6 @@ 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 +2948,6 @@ 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 +2958,8 @@ 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 +4248,12 @@ 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 +4540,7 @@ 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,
|
||||
|
|
|
|||
Loading…
Reference in a new issue