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Merge branch 'slab/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux 

Pull SLAB changes from Pekka Enberg:
 "There's the new kmalloc_array() API, minor fixes and performance
  improvements, but quite honestly, nothing terribly exciting."

* 'slab/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux:
  mm: SLAB Out-of-memory diagnostics
  slab: introduce kmalloc_array()
  slub: per cpu partial statistics change
  slub: include include for prefetch
  slub: Do not hold slub_lock when calling sysfs_slab_add()
  slub: prefetch next freelist pointer in slab_alloc()
  slab, cleanup: remove unneeded return
This commit is contained in:
Linus Torvalds 2012-03-28 15:04:26 -07:00
parent ed0bb8ea05 8bdec192b4
commit 0c9aac0826
4 changed files with 91 additions and 14 deletions
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17
include/linux/slab.h
View File

@ -190,7 +190,7 @@ size_t ksize(const void *);
#endif
/**
* kcalloc - allocate memory for an array. The memory is set to zero.
* kmalloc_array - allocate memory for an array.
* @n: number of elements.
* @size: element size.
* @flags: the type of memory to allocate.
@ -240,11 +240,22 @@ size_t ksize(const void *);
* for general use, and so are not documented here. For a full list of
* potential flags, always refer to linux/gfp.h.
*/
static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
static inline void *kmalloc_array(size_t n, size_t size, gfp_t flags)
{
if (size != 0 && n > ULONG_MAX / size)
return NULL;
return __kmalloc(n * size, flags | __GFP_ZERO);
return __kmalloc(n * size, flags);
}
/**
* kcalloc - allocate memory for an array. The memory is set to zero.
* @n: number of elements.
* @size: element size.
* @flags: the type of memory to allocate (see kmalloc).
*/
static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
{
return kmalloc_array(n, size, flags | __GFP_ZERO);
}
#if !defined(CONFIG_NUMA) && !defined(CONFIG_SLOB)

6
include/linux/slub_def.h
View File

@ -22,7 +22,7 @@ enum stat_item {
FREE_FROZEN, /* Freeing to frozen slab */
FREE_ADD_PARTIAL, /* Freeing moves slab to partial list */
FREE_REMOVE_PARTIAL, /* Freeing removes last object */
ALLOC_FROM_PARTIAL, /* Cpu slab acquired from partial list */
ALLOC_FROM_PARTIAL, /* Cpu slab acquired from node partial list */
ALLOC_SLAB, /* Cpu slab acquired from page allocator */
ALLOC_REFILL, /* Refill cpu slab from slab freelist */
ALLOC_NODE_MISMATCH, /* Switching cpu slab */
@ -38,7 +38,9 @@ enum stat_item {
CMPXCHG_DOUBLE_CPU_FAIL,/* Failure of this_cpu_cmpxchg_double */
CMPXCHG_DOUBLE_FAIL, /* Number of times that cmpxchg double did not match */
CPU_PARTIAL_ALLOC, /* Used cpu partial on alloc */
CPU_PARTIAL_FREE, /* USed cpu partial on free */
CPU_PARTIAL_FREE, /* Refill cpu partial on free */
CPU_PARTIAL_NODE, /* Refill cpu partial from node partial */
CPU_PARTIAL_DRAIN, /* Drain cpu partial to node partial */
NR_SLUB_STAT_ITEMS };
struct kmem_cache_cpu {

56
mm/slab.c
View File

@ -1731,6 +1731,52 @@ static int __init cpucache_init(void)
}
__initcall(cpucache_init);
static noinline void
slab_out_of_memory(struct kmem_cache *cachep, gfp_t gfpflags, int nodeid)
{
struct kmem_list3 *l3;
struct slab *slabp;
unsigned long flags;
int node;
printk(KERN_WARNING
"SLAB: Unable to allocate memory on node %d (gfp=0x%x)\n",
nodeid, gfpflags);
printk(KERN_WARNING " cache: %s, object size: %d, order: %d\n",
cachep->name, cachep->buffer_size, cachep->gfporder);
for_each_online_node(node) {
unsigned long active_objs = 0, num_objs = 0, free_objects = 0;
unsigned long active_slabs = 0, num_slabs = 0;
l3 = cachep->nodelists[node];
if (!l3)
continue;
spin_lock_irqsave(&l3->list_lock, flags);
list_for_each_entry(slabp, &l3->slabs_full, list) {
active_objs += cachep->num;
active_slabs++;
}
list_for_each_entry(slabp, &l3->slabs_partial, list) {
active_objs += slabp->inuse;
active_slabs++;
}
list_for_each_entry(slabp, &l3->slabs_free, list)
num_slabs++;
free_objects += l3->free_objects;
spin_unlock_irqrestore(&l3->list_lock, flags);
num_slabs += active_slabs;
num_objs = num_slabs * cachep->num;
printk(KERN_WARNING
" node %d: slabs: %ld/%ld, objs: %ld/%ld, free: %ld\n",
node, active_slabs, num_slabs, active_objs, num_objs,
free_objects);
}
}
/*
* Interface to system's page allocator. No need to hold the cache-lock.
*
@ -1757,8 +1803,11 @@ static void *kmem_getpages(struct kmem_cache *cachep, gfp_t flags, int nodeid)
flags |= __GFP_RECLAIMABLE;
page = alloc_pages_exact_node(nodeid, flags | __GFP_NOTRACK, cachep->gfporder);
if (!page)
if (!page) {
if (!(flags & __GFP_NOWARN) && printk_ratelimit())
slab_out_of_memory(cachep, flags, nodeid);
return NULL;
}
nr_pages = (1 << cachep->gfporder);
if (cachep->flags & SLAB_RECLAIM_ACCOUNT)
@ -3696,13 +3745,12 @@ static inline void __cache_free(struct kmem_cache *cachep, void *objp,
if (likely(ac->avail < ac->limit)) {
STATS_INC_FREEHIT(cachep);
ac->entry[ac->avail++] = objp;
return;
} else {
STATS_INC_FREEMISS(cachep);
cache_flusharray(cachep, ac);
ac->entry[ac->avail++] = objp;
}
ac->entry[ac->avail++] = objp;
}
/**

26
mm/slub.c
View File

@ -29,6 +29,7 @@
#include <linux/math64.h>
#include <linux/fault-inject.h>
#include <linux/stacktrace.h>
#include <linux/prefetch.h>
#include <trace/events/kmem.h>
@ -269,6 +270,11 @@ static inline void *get_freepointer(struct kmem_cache *s, void *object)
return *(void **)(object + s->offset);
}
static void prefetch_freepointer(const struct kmem_cache *s, void *object)
{
prefetch(object + s->offset);
}
static inline void *get_freepointer_safe(struct kmem_cache *s, void *object)
{
void *p;
@ -1560,6 +1566,7 @@ static void *get_partial_node(struct kmem_cache *s,
} else {
page->freelist = t;
available = put_cpu_partial(s, page, 0);
stat(s, CPU_PARTIAL_NODE);
}
if (kmem_cache_debug(s) || available > s->cpu_partial / 2)
break;
@ -1983,6 +1990,7 @@ int put_cpu_partial(struct kmem_cache *s, struct page *page, int drain)
local_irq_restore(flags);
pobjects = 0;
pages = 0;
stat(s, CPU_PARTIAL_DRAIN);
}
}
@ -1994,7 +2002,6 @@ int put_cpu_partial(struct kmem_cache *s, struct page *page, int drain)
page->next = oldpage;
} while (this_cpu_cmpxchg(s->cpu_slab->partial, oldpage, page) != oldpage);
stat(s, CPU_PARTIAL_FREE);
return pobjects;
}
@ -2319,6 +2326,8 @@ redo:
object = __slab_alloc(s, gfpflags, node, addr, c);
else {
void *next_object = get_freepointer_safe(s, object);
/*
* The cmpxchg will only match if there was no additional
* operation and if we are on the right processor.
@ -2334,11 +2343,12 @@ redo:
if (unlikely(!this_cpu_cmpxchg_double(
s->cpu_slab->freelist, s->cpu_slab->tid,
object, tid,
get_freepointer_safe(s, object), next_tid(tid)))) {
next_object, next_tid(tid)))) {
note_cmpxchg_failure("slab_alloc", s, tid);
goto redo;
}
prefetch_freepointer(s, next_object);
stat(s, ALLOC_FASTPATH);
}
@ -2475,9 +2485,10 @@ static void __slab_free(struct kmem_cache *s, struct page *page,
* If we just froze the page then put it onto the
* per cpu partial list.
*/
if (new.frozen && !was_frozen)
if (new.frozen && !was_frozen) {
put_cpu_partial(s, page, 1);
stat(s, CPU_PARTIAL_FREE);
}
/*
* The list lock was not taken therefore no list
* activity can be necessary.
@ -3939,13 +3950,14 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size,
if (kmem_cache_open(s, n,
size, align, flags, ctor)) {
list_add(&s->list, &slab_caches);
up_write(&slub_lock);
if (sysfs_slab_add(s)) {
down_write(&slub_lock);
list_del(&s->list);
kfree(n);
kfree(s);
goto err;
}
up_write(&slub_lock);
return s;
}
kfree(n);
@ -5069,6 +5081,8 @@ STAT_ATTR(CMPXCHG_DOUBLE_CPU_FAIL, cmpxchg_double_cpu_fail);
STAT_ATTR(CMPXCHG_DOUBLE_FAIL, cmpxchg_double_fail);
STAT_ATTR(CPU_PARTIAL_ALLOC, cpu_partial_alloc);
STAT_ATTR(CPU_PARTIAL_FREE, cpu_partial_free);
STAT_ATTR(CPU_PARTIAL_NODE, cpu_partial_node);
STAT_ATTR(CPU_PARTIAL_DRAIN, cpu_partial_drain);
#endif
static struct attribute *slab_attrs[] = {
@ -5134,6 +5148,8 @@ static struct attribute *slab_attrs[] = {
&cmpxchg_double_cpu_fail_attr.attr,
&cpu_partial_alloc_attr.attr,
&cpu_partial_free_attr.attr,
&cpu_partial_node_attr.attr,
&cpu_partial_drain_attr.attr,
#endif
#ifdef CONFIG_FAILSLAB
&failslab_attr.attr,