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-rw-r--r--mm/slab.c1194
1 files changed, 610 insertions, 584 deletions
diff --git a/mm/slab.c b/mm/slab.c
index e5ec26e0c46..6f8495e2185 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -68,7 +68,7 @@
* Further notes from the original documentation:
*
* 11 April '97. Started multi-threading - markhe
- * The global cache-chain is protected by the semaphore 'cache_chain_sem'.
+ * The global cache-chain is protected by the mutex 'cache_chain_mutex'.
* The sem is only needed when accessing/extending the cache-chain, which
* can never happen inside an interrupt (kmem_cache_create(),
* kmem_cache_shrink() and kmem_cache_reap()).
@@ -103,6 +103,8 @@
#include <linux/rcupdate.h>
#include <linux/string.h>
#include <linux/nodemask.h>
+#include <linux/mempolicy.h>
+#include <linux/mutex.h>
#include <asm/uaccess.h>
#include <asm/cacheflush.h>
@@ -130,7 +132,6 @@
#define FORCED_DEBUG 0
#endif
-
/* Shouldn't this be in a header file somewhere? */
#define BYTES_PER_WORD sizeof(void *)
@@ -217,12 +218,12 @@ static unsigned long offslab_limit;
* 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 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;
};
/*
@@ -242,9 +243,9 @@ struct slab {
* We assume struct slab_rcu can overlay struct slab when destroying.
*/
struct slab_rcu {
- struct rcu_head head;
- kmem_cache_t *cachep;
- void *addr;
+ struct rcu_head head;
+ kmem_cache_t *cachep;
+ void *addr;
};
/*
@@ -279,23 +280,23 @@ struct array_cache {
#define BOOT_CPUCACHE_ENTRIES 1
struct arraycache_init {
struct array_cache cache;
- void * entries[BOOT_CPUCACHE_ENTRIES];
+ void *entries[BOOT_CPUCACHE_ENTRIES];
};
/*
* The slab lists for all objects.
*/
struct kmem_list3 {
- struct list_head slabs_partial; /* partial list first, better asm code */
- struct list_head slabs_full;
- struct list_head slabs_free;
- unsigned long free_objects;
- unsigned long next_reap;
- int free_touched;
- unsigned int free_limit;
- spinlock_t list_lock;
- struct array_cache *shared; /* shared per node */
- struct array_cache **alien; /* on other nodes */
+ struct list_head slabs_partial; /* partial list first, better asm code */
+ struct list_head slabs_full;
+ struct list_head slabs_free;
+ unsigned long free_objects;
+ unsigned long next_reap;
+ int free_touched;
+ unsigned int free_limit;
+ spinlock_t list_lock;
+ struct array_cache *shared; /* shared per node */
+ struct array_cache **alien; /* on other nodes */
};
/*
@@ -367,63 +368,63 @@ static inline void kmem_list3_init(struct kmem_list3 *parent)
*
* manages a cache.
*/
-
+
struct kmem_cache {
/* 1) per-cpu data, touched during every alloc/free */
- struct array_cache *array[NR_CPUS];
- unsigned int batchcount;
- unsigned int limit;
- unsigned int shared;
- unsigned int objsize;
+ struct array_cache *array[NR_CPUS];
+ unsigned int batchcount;
+ unsigned int limit;
+ unsigned int shared;
+ unsigned int objsize;
/* 2) touched by every alloc & free from the backend */
- struct kmem_list3 *nodelists[MAX_NUMNODES];
- unsigned int flags; /* constant flags */
- unsigned int num; /* # of objs per slab */
- spinlock_t spinlock;
+ struct kmem_list3 *nodelists[MAX_NUMNODES];
+ unsigned int flags; /* constant flags */
+ unsigned int num; /* # of objs per slab */
+ spinlock_t spinlock;
/* 3) cache_grow/shrink */
/* order of pgs per slab (2^n) */
- unsigned int gfporder;
+ unsigned int gfporder;
/* force GFP flags, e.g. GFP_DMA */
- gfp_t gfpflags;
+ gfp_t gfpflags;
- size_t colour; /* cache colouring range */
- unsigned int colour_off; /* colour offset */
- unsigned int colour_next; /* cache colouring */
- kmem_cache_t *slabp_cache;
- unsigned int slab_size;
- unsigned int dflags; /* dynamic flags */
+ size_t colour; /* cache colouring range */
+ unsigned int colour_off; /* colour offset */
+ unsigned int colour_next; /* cache colouring */
+ kmem_cache_t *slabp_cache;
+ unsigned int slab_size;
+ unsigned int dflags; /* dynamic flags */
/* constructor func */
- void (*ctor)(void *, kmem_cache_t *, unsigned long);
+ void (*ctor) (void *, kmem_cache_t *, unsigned long);
/* de-constructor func */
- void (*dtor)(void *, kmem_cache_t *, unsigned long);
+ void (*dtor) (void *, kmem_cache_t *, unsigned long);
/* 4) cache creation/removal */
- const char *name;
- struct list_head next;
+ const char *name;
+ struct list_head next;
/* 5) statistics */
#if STATS
- unsigned long num_active;
- unsigned long num_allocations;
- unsigned long high_mark;
- unsigned long grown;
- unsigned long reaped;
- unsigned long errors;
- unsigned long max_freeable;
- unsigned long node_allocs;
- unsigned long node_frees;
- atomic_t allochit;
- atomic_t allocmiss;
- atomic_t freehit;
- atomic_t freemiss;
+ unsigned long num_active;
+ unsigned long num_allocations;
+ unsigned long high_mark;
+ unsigned long grown;
+ unsigned long reaped;
+ unsigned long errors;
+ unsigned long max_freeable;
+ unsigned long node_allocs;
+ unsigned long node_frees;
+ atomic_t allochit;
+ atomic_t allocmiss;
+ atomic_t freehit;
+ atomic_t freemiss;
#endif
#if DEBUG
- int dbghead;
- int reallen;
+ int dbghead;
+ int reallen;
#endif
};
@@ -523,14 +524,15 @@ static unsigned long *dbg_redzone2(kmem_cache_t *cachep, void *objp)
{
BUG_ON(!(cachep->flags & SLAB_RED_ZONE));
if (cachep->flags & SLAB_STORE_USER)
- return (unsigned long*) (objp+cachep->objsize-2*BYTES_PER_WORD);
- return (unsigned long*) (objp+cachep->objsize-BYTES_PER_WORD);
+ return (unsigned long *)(objp + cachep->objsize -
+ 2 * BYTES_PER_WORD);
+ return (unsigned long *)(objp + cachep->objsize - BYTES_PER_WORD);
}
static void **dbg_userword(kmem_cache_t *cachep, void *objp)
{
BUG_ON(!(cachep->flags & SLAB_STORE_USER));
- return (void**)(objp+cachep->objsize-BYTES_PER_WORD);
+ return (void **)(objp + cachep->objsize - BYTES_PER_WORD);
}
#else
@@ -607,31 +609,31 @@ struct cache_names {
static struct cache_names __initdata cache_names[] = {
#define CACHE(x) { .name = "size-" #x, .name_dma = "size-" #x "(DMA)" },
#include <linux/kmalloc_sizes.h>
- { NULL, }
+ {NULL,}
#undef CACHE
};
static struct arraycache_init initarray_cache __initdata =
- { { 0, BOOT_CPUCACHE_ENTRIES, 1, 0} };
+ { {0, BOOT_CPUCACHE_ENTRIES, 1, 0} };
static struct arraycache_init initarray_generic =
- { { 0, BOOT_CPUCACHE_ENTRIES, 1, 0} };
+ { {0, BOOT_CPUCACHE_ENTRIES, 1, 0} };
/* internal cache of cache description objs */
static kmem_cache_t cache_cache = {
- .batchcount = 1,
- .limit = BOOT_CPUCACHE_ENTRIES,
- .shared = 1,
- .objsize = sizeof(kmem_cache_t),
- .flags = SLAB_NO_REAP,
- .spinlock = SPIN_LOCK_UNLOCKED,
- .name = "kmem_cache",
+ .batchcount = 1,
+ .limit = BOOT_CPUCACHE_ENTRIES,
+ .shared = 1,
+ .objsize = sizeof(kmem_cache_t),
+ .flags = SLAB_NO_REAP,
+ .spinlock = SPIN_LOCK_UNLOCKED,
+ .name = "kmem_cache",
#if DEBUG
- .reallen = sizeof(kmem_cache_t),
+ .reallen = sizeof(kmem_cache_t),
#endif
};
/* Guard access to the cache-chain. */
-static struct semaphore cache_chain_sem;
+static DEFINE_MUTEX(cache_chain_mutex);
static struct list_head cache_chain;
/*
@@ -655,9 +657,9 @@ static enum {
static DEFINE_PER_CPU(struct work_struct, reap_work);
-static void free_block(kmem_cache_t* cachep, void** objpp, int len, int node);
-static void enable_cpucache (kmem_cache_t *cachep);
-static void cache_reap (void *unused);
+static void free_block(kmem_cache_t *cachep, void **objpp, int len, int node);
+static void enable_cpucache(kmem_cache_t *cachep);
+static void cache_reap(void *unused);
static int __node_shrink(kmem_cache_t *cachep, int node);
static inline struct array_cache *ac_data(kmem_cache_t *cachep)
@@ -671,9 +673,9 @@ static inline kmem_cache_t *__find_general_cachep(size_t size, gfp_t gfpflags)
#if DEBUG
/* This happens if someone tries to call
- * kmem_cache_create(), or __kmalloc(), before
- * the generic caches are initialized.
- */
+ * kmem_cache_create(), or __kmalloc(), before
+ * the generic caches are initialized.
+ */
BUG_ON(malloc_sizes[INDEX_AC].cs_cachep == NULL);
#endif
while (size > csizep->cs_size)
@@ -697,10 +699,10 @@ EXPORT_SYMBOL(kmem_find_general_cachep);
/* Cal the num objs, wastage, and bytes left over for a given slab size. */
static void cache_estimate(unsigned long gfporder, size_t size, size_t align,
- int flags, size_t *left_over, unsigned int *num)
+ int flags, size_t *left_over, unsigned int *num)
{
int i;
- size_t wastage = PAGE_SIZE<<gfporder;
+ size_t wastage = PAGE_SIZE << gfporder;
size_t extra = 0;
size_t base = 0;
@@ -709,7 +711,7 @@ static void cache_estimate(unsigned long gfporder, size_t size, size_t align,
extra = sizeof(kmem_bufctl_t);
}
i = 0;
- while (i*size + ALIGN(base+i*extra, align) <= wastage)
+ while (i * size + ALIGN(base + i * extra, align) <= wastage)
i++;
if (i > 0)
i--;
@@ -718,8 +720,8 @@ static void cache_estimate(unsigned long gfporder, size_t size, size_t align,
i = SLAB_LIMIT;
*num = i;
- wastage -= i*size;
- wastage -= ALIGN(base+i*extra, align);
+ wastage -= i * size;
+ wastage -= ALIGN(base + i * extra, align);
*left_over = wastage;
}
@@ -728,7 +730,7 @@ static void cache_estimate(unsigned long gfporder, size_t size, size_t align,
static void __slab_error(const char *function, kmem_cache_t *cachep, char *msg)
{
printk(KERN_ERR "slab error in %s(): cache `%s': %s\n",
- function, cachep->name, msg);
+ function, cachep->name, msg);
dump_stack();
}
@@ -755,9 +757,9 @@ static void __devinit start_cpu_timer(int cpu)
}
static struct array_cache *alloc_arraycache(int node, int entries,
- int batchcount)
+ int batchcount)
{
- int memsize = sizeof(void*)*entries+sizeof(struct array_cache);
+ int memsize = sizeof(void *) * entries + sizeof(struct array_cache);
struct array_cache *nc = NULL;
nc = kmalloc_node(memsize, GFP_KERNEL, node);
@@ -772,10 +774,12 @@ static struct array_cache *alloc_arraycache(int node, int entries,
}
#ifdef CONFIG_NUMA
+static void *__cache_alloc_node(kmem_cache_t *, gfp_t, int);
+
static inline struct array_cache **alloc_alien_cache(int node, int limit)
{
struct array_cache **ac_ptr;
- int memsize = sizeof(void*)*MAX_NUMNODES;
+ int memsize = sizeof(void *) * MAX_NUMNODES;
int i;
if (limit > 1)
@@ -789,7 +793,7 @@ static inline struct array_cache **alloc_alien_cache(int node, int limit)
}
ac_ptr[i] = alloc_arraycache(node, limit, 0xbaadf00d);
if (!ac_ptr[i]) {
- for (i--; i <=0; i--)
+ for (i--; i <= 0; i--)
kfree(ac_ptr[i]);
kfree(ac_ptr);
return NULL;
@@ -807,12 +811,13 @@ static inline void free_alien_cache(struct array_cache **ac_ptr)
return;
for_each_node(i)
- kfree(ac_ptr[i]);
+ kfree(ac_ptr[i]);
kfree(ac_ptr);
}
-static inline void __drain_alien_cache(kmem_cache_t *cachep, struct array_cache *ac, int node)
+static inline void __drain_alien_cache(kmem_cache_t *cachep,
+ struct array_cache *ac, int node)
{
struct kmem_list3 *rl3 = cachep->nodelists[node];
@@ -826,7 +831,7 @@ static inline void __drain_alien_cache(kmem_cache_t *cachep, struct array_cache
static void drain_alien_cache(kmem_cache_t *cachep, struct kmem_list3 *l3)
{
- int i=0;
+ int i = 0;
struct array_cache *ac;
unsigned long flags;
@@ -846,18 +851,17 @@ static void drain_alien_cache(kmem_cache_t *cachep, struct kmem_list3 *l3)
#endif
static int __devinit cpuup_callback(struct notifier_block *nfb,
- unsigned long action, void *hcpu)
+ unsigned long action, void *hcpu)
{
long cpu = (long)hcpu;
- kmem_cache_t* cachep;
+ kmem_cache_t *cachep;
struct kmem_list3 *l3 = NULL;
int node = cpu_to_node(cpu);
int memsize = sizeof(struct kmem_list3);
- struct array_cache *nc = NULL;
switch (action) {
case CPU_UP_PREPARE:
- down(&cache_chain_sem);
+ mutex_lock(&cache_chain_mutex);
/* we need to do this right in the beginning since
* alloc_arraycache's are going to use this list.
* kmalloc_node allows us to add the slab to the right
@@ -871,27 +875,29 @@ static int __devinit cpuup_callback(struct notifier_block *nfb,
*/
if (!cachep->nodelists[node]) {
if (!(l3 = kmalloc_node(memsize,
- GFP_KERNEL, node)))
+ GFP_KERNEL, node)))
goto bad;
kmem_list3_init(l3);
l3->next_reap = jiffies + REAPTIMEOUT_LIST3 +
- ((unsigned long)cachep)%REAPTIMEOUT_LIST3;
+ ((unsigned long)cachep) % REAPTIMEOUT_LIST3;
cachep->nodelists[node] = l3;
}
spin_lock_irq(&cachep->nodelists[node]->list_lock);
cachep->nodelists[node]->free_limit =
- (1 + nr_cpus_node(node)) *
- cachep->batchcount + cachep->num;
+ (1 + nr_cpus_node(node)) *
+ cachep->batchcount + cachep->num;
spin_unlock_irq(&cachep->nodelists[node]->list_lock);
}
/* Now we can go ahead with allocating the shared array's
- & array cache's */
+ & array cache's */
list_for_each_entry(cachep, &cache_chain, next) {
+ struct array_cache *nc;
+
nc = alloc_arraycache(node, cachep->limit,
- cachep->batchcount);
+ cachep->batchcount);
if (!nc)
goto bad;
cachep->array[cpu] = nc;
@@ -900,16 +906,17 @@ static int __devinit cpuup_callback(struct notifier_block *nfb,
BUG_ON(!l3);
if (!l3->shared) {
if (!(nc = alloc_arraycache(node,
- cachep->shared*cachep->batchcount,
- 0xbaadf00d)))
- goto bad;
+ cachep->shared *
+ cachep->batchcount,
+ 0xbaadf00d)))
+ goto bad;
/* we are serialised from CPU_DEAD or
- CPU_UP_CANCELLED by the cpucontrol lock */
+ CPU_UP_CANCELLED by the cpucontrol lock */
l3->shared = nc;
}
}
- up(&cache_chain_sem);
+ mutex_unlock(&cache_chain_mutex);
break;
case CPU_ONLINE:
start_cpu_timer(cpu);
@@ -918,7 +925,7 @@ static int __devinit cpuup_callback(struct notifier_block *nfb,
case CPU_DEAD:
/* fall thru */
case CPU_UP_CANCELED:
- down(&cache_chain_sem);
+ mutex_lock(&cache_chain_mutex);
list_for_each_entry(cachep, &cache_chain, next) {
struct array_cache *nc;
@@ -942,13 +949,13 @@ static int __devinit cpuup_callback(struct notifier_block *nfb,
free_block(cachep, nc->entry, nc->avail, node);
if (!cpus_empty(mask)) {
- spin_unlock(&l3->list_lock);
- goto unlock_cache;
- }
+ spin_unlock(&l3->list_lock);
+ goto unlock_cache;
+ }
if (l3->shared) {
free_block(cachep, l3->shared->entry,
- l3->shared->avail, node);
+ l3->shared->avail, node);
kfree(l3->shared);
l3->shared = NULL;
}
@@ -966,17 +973,17 @@ static int __devinit cpuup_callback(struct notifier_block *nfb,
} else {
spin_unlock(&l3->list_lock);
}
-unlock_cache:
+ unlock_cache:
spin_unlock_irq(&cachep->spinlock);
kfree(nc);
}
- up(&cache_chain_sem);
+ mutex_unlock(&cache_chain_mutex);
break;
#endif
}
return NOTIFY_OK;
-bad:
- up(&cache_chain_sem);
+ bad:
+ mutex_unlock(&cache_chain_mutex);
return NOTIFY_BAD;
}
@@ -985,8 +992,7 @@ static struct notifier_block cpucache_notifier = { &cpuup_callback, NULL, 0 };
/*
* swap the static kmem_list3 with kmalloced memory
*/
-static void init_list(kmem_cache_t *cachep, struct kmem_list3 *list,
- int nodeid)
+static void init_list(kmem_cache_t *cachep, struct kmem_list3 *list, int nodeid)
{
struct kmem_list3 *ptr;
@@ -1045,7 +1051,6 @@ void __init kmem_cache_init(void)
*/
/* 1) create the cache_cache */
- init_MUTEX(&cache_chain_sem);
INIT_LIST_HEAD(&cache_chain);
list_add(&cache_cache.next, &cache_chain);
cache_cache.colour_off = cache_line_size();
@@ -1055,14 +1060,14 @@ void __init kmem_cache_init(void)
cache_cache.objsize = ALIGN(cache_cache.objsize, cache_line_size());
cache_estimate(0, cache_cache.objsize, cache_line_size(), 0,
- &left_over, &cache_cache.num);
+ &left_over, &cache_cache.num);
if (!cache_cache.num)
BUG();
- cache_cache.colour = left_over/cache_cache.colour_off;
+ cache_cache.colour = left_over / cache_cache.colour_off;
cache_cache.colour_next = 0;
- cache_cache.slab_size = ALIGN(cache_cache.num*sizeof(kmem_bufctl_t) +
- sizeof(struct slab), cache_line_size());
+ cache_cache.slab_size = ALIGN(cache_cache.num * sizeof(kmem_bufctl_t) +
+ sizeof(struct slab), cache_line_size());
/* 2+3) create the kmalloc caches */
sizes = malloc_sizes;
@@ -1074,14 +1079,18 @@ void __init kmem_cache_init(void)
*/
sizes[INDEX_AC].cs_cachep = kmem_cache_create(names[INDEX_AC].name,
- sizes[INDEX_AC].cs_size, ARCH_KMALLOC_MINALIGN,
- (ARCH_KMALLOC_FLAGS | SLAB_PANIC), NULL, NULL);
+ sizes[INDEX_AC].cs_size,
+ ARCH_KMALLOC_MINALIGN,
+ (ARCH_KMALLOC_FLAGS |
+ SLAB_PANIC), NULL, NULL);
if (INDEX_AC != INDEX_L3)
sizes[INDEX_L3].cs_cachep =
- kmem_cache_create(names[INDEX_L3].name,
- sizes[INDEX_L3].cs_size, ARCH_KMALLOC_MINALIGN,
- (ARCH_KMALLOC_FLAGS | SLAB_PANIC), NULL, NULL);
+ kmem_cache_create(names[INDEX_L3].name,
+ sizes[INDEX_L3].cs_size,
+ ARCH_KMALLOC_MINALIGN,
+ (ARCH_KMALLOC_FLAGS | SLAB_PANIC), NULL,
+ NULL);
while (sizes->cs_size != ULONG_MAX) {
/*
@@ -1091,35 +1100,41 @@ void __init kmem_cache_init(void)
* Note for systems short on memory removing the alignment will
* allow tighter packing of the smaller caches.
*/
- if(!sizes->cs_cachep)
+ if (!sizes->cs_cachep)
sizes->cs_cachep = kmem_cache_create(names->name,
- sizes->cs_size, ARCH_KMALLOC_MINALIGN,
- (ARCH_KMALLOC_FLAGS | SLAB_PANIC), NULL, NULL);
+ sizes->cs_size,
+ ARCH_KMALLOC_MINALIGN,
+ (ARCH_KMALLOC_FLAGS
+ | SLAB_PANIC),
+ NULL, NULL);
/* Inc off-slab bufctl limit until the ceiling is hit. */
if (!(OFF_SLAB(sizes->cs_cachep))) {
- offslab_limit = sizes->cs_size-sizeof(struct slab);
+ offslab_limit = sizes->cs_size - sizeof(struct slab);
offslab_limit /= sizeof(kmem_bufctl_t);
}
sizes->cs_dmacachep = kmem_cache_create(names->name_dma,
- sizes->cs_size, ARCH_KMALLOC_MINALIGN,
- (ARCH_KMALLOC_FLAGS | SLAB_CACHE_DMA | SLAB_PANIC),
- NULL, NULL);
+ sizes->cs_size,
+ ARCH_KMALLOC_MINALIGN,
+ (ARCH_KMALLOC_FLAGS |
+ SLAB_CACHE_DMA |
+ SLAB_PANIC), NULL,
+ NULL);
sizes++;
names++;
}
/* 4) Replace the bootstrap head arrays */
{
- void * ptr;
+ void *ptr;
ptr = kmalloc(sizeof(struct arraycache_init), GFP_KERNEL);
local_irq_disable();
BUG_ON(ac_data(&cache_cache) != &initarray_cache.cache);
memcpy(ptr, ac_data(&cache_cache),
- sizeof(struct arraycache_init));
+ sizeof(struct arraycache_init));
cache_cache.array[smp_processor_id()] = ptr;
local_irq_enable();
@@ -1127,11 +1142,11 @@ void __init kmem_cache_init(void)
local_irq_disable();
BUG_ON(ac_data(malloc_sizes[INDEX_AC].cs_cachep)
- != &initarray_generic.cache);
+ != &initarray_generic.cache);
memcpy(ptr, ac_data(malloc_sizes[INDEX_AC].cs_cachep),
- sizeof(struct arraycache_init));
+ sizeof(struct arraycache_init));
malloc_sizes[INDEX_AC].cs_cachep->array[smp_processor_id()] =
- ptr;
+ ptr;
local_irq_enable();
}
/* 5) Replace the bootstrap kmem_list3's */
@@ -1139,16 +1154,16 @@ void __init kmem_cache_init(void)
int node;
/* Replace the static kmem_list3 structures for the boot cpu */
init_list(&cache_cache, &initkmem_list3[CACHE_CACHE],
- numa_node_id());
+ numa_node_id());
for_each_online_node(node) {
init_list(malloc_sizes[INDEX_AC].cs_cachep,
- &initkmem_list3[SIZE_AC+node], node);
+ &initkmem_list3[SIZE_AC + node], node);
if (INDEX_AC != INDEX_L3) {
init_list(malloc_sizes[INDEX_L3].cs_cachep,
- &initkmem_list3[SIZE_L3+node],
- node);
+ &initkmem_list3[SIZE_L3 + node],
+ node);
}
}
}
@@ -1156,10 +1171,10 @@ void __init kmem_cache_init(void)
/* 6) resize the head arrays to their final sizes */
{
kmem_cache_t *cachep;
- down(&cache_chain_sem);
+ mutex_lock(&cache_chain_mutex);
list_for_each_entry(cachep, &cache_chain, next)
- enable_cpucache(cachep);
- up(&cache_chain_sem);
+ enable_cpucache(cachep);
+ mutex_unlock(&cache_chain_mutex);
}
/* Done! */
@@ -1184,7 +1199,7 @@ static int __init cpucache_init(void)
* pages to gfp.
*/
for_each_online_cpu(cpu)
- start_cpu_timer(cpu);
+ start_cpu_timer(cpu);
return 0;
}
@@ -1226,7 +1241,7 @@ static void *kmem_getpages(kmem_cache_t *cachep, gfp_t flags, int nodeid)
*/
static void kmem_freepages(kmem_cache_t *cachep, void *addr)
{
- unsigned long i = (1<<cachep->gfporder);
+ unsigned long i = (1 << cachep->gfporder);
struct page *page = virt_to_page(addr);
const unsigned long nr_freed = i;
@@ -1239,13 +1254,13 @@ static void kmem_freepages(kmem_cache_t *cachep, void *addr)
if (current->reclaim_state)
current->reclaim_state->reclaimed_slab += nr_freed;
free_pages((unsigned long)addr, cachep->gfporder);
- if (cachep->flags & SLAB_RECLAIM_ACCOUNT)
- atomic_sub(1<<cachep->gfporder, &slab_reclaim_pages);
+ if (cachep->flags & SLAB_RECLAIM_ACCOUNT)
+ atomic_sub(1 << cachep->gfporder, &slab_reclaim_pages);
}
static void kmem_rcu_free(struct rcu_head *head)
{
- struct slab_rcu *slab_rcu = (struct slab_rcu *) head;
+ struct slab_rcu *slab_rcu = (struct slab_rcu *)head;
kmem_cache_t *cachep = slab_rcu->cachep;
kmem_freepages(cachep, slab_rcu->addr);
@@ -1257,19 +1272,19 @@ static void kmem_rcu_free(struct rcu_head *head)
#ifdef CONFIG_DEBUG_PAGEALLOC
static void store_stackinfo(kmem_cache_t *cachep, unsigned long *addr,
- unsigned long caller)
+ unsigned long caller)
{
int size = obj_reallen(cachep);
- addr = (unsigned long *)&((char*)addr)[obj_dbghead(cachep)];
+ addr = (unsigned long *)&((char *)addr)[obj_dbghead(cachep)];
- if (size < 5*sizeof(unsigned long))
+ if (size < 5 * sizeof(unsigned long))
return;
- *addr++=0x12345678;
- *addr++=caller;
- *addr++=smp_processor_id();
- size -= 3*sizeof(unsigned long);
+ *addr++ = 0x12345678;
+ *addr++ = caller;
+ *addr++ = smp_processor_id();
+ size -= 3 * sizeof(unsigned long);
{
unsigned long *sptr = &caller;
unsigned long svalue;
@@ -1277,7 +1292,7 @@ static void store_stackinfo(kmem_cache_t *cachep, unsigned long *addr,
while (!kstack_end(sptr)) {
svalue = *sptr++;
if (kernel_text_address(svalue)) {
- *addr++=svalue;
+ *addr++ = svalue;
size -= sizeof(unsigned long);
if (size <= sizeof(unsigned long))
break;
@@ -1285,25 +1300,25 @@ static void store_stackinfo(kmem_cache_t *cachep, unsigned long *addr,
}
}
- *addr++=0x87654321;
+ *addr++ = 0x87654321;
}
#endif
static void poison_obj(kmem_cache_t *cachep, void *addr, unsigned char val)
{
int size = obj_reallen(cachep);
- addr = &((char*)addr)[obj_dbghead(cachep)];
+ addr = &((char *)addr)[obj_dbghead(cachep)];
memset(addr, val, size);
- *(unsigned char *)(addr+size-1) = POISON_END;
+ *(unsigned char *)(addr + size - 1) = POISON_END;
}
static void dump_line(char *data, int offset, int limit)
{
int i;
printk(KERN_ERR "%03x:", offset);
- for (i=0;i<limit;i++) {
- printk(" %02x", (unsigned char)data[offset+i]);
+ for (i = 0; i < limit; i++) {
+ printk(" %02x", (unsigned char)data[offset + i]);
}
printk("\n");
}
@@ -1318,24 +1333,24 @@ static void print_objinfo(kmem_cache_t *cachep, void *objp, int lines)
if (cachep->flags & SLAB_RED_ZONE) {
printk(KERN_ERR "Redzone: 0x%lx/0x%lx.\n",
- *dbg_redzone1(cachep, objp),
- *dbg_redzone2(cachep, objp));
+ *dbg_redzone1(cachep, objp),
+ *dbg_redzone2(cachep, objp));
}
if (cachep->flags & SLAB_STORE_USER) {
printk(KERN_ERR "Last user: [<%p>]",
- *dbg_userword(cachep, objp));
+ *dbg_userword(cachep, objp));
print_symbol("(%s)",
- (unsigned long)*dbg_userword(cachep, objp));
+ (unsigned long)*dbg_userword(cachep, objp));
printk("\n");
}
- realobj = (char*)objp+obj_dbghead(cachep);
+ realobj = (char *)objp + obj_dbghead(cachep);
size = obj_reallen(cachep);
- for (i=0; i<size && lines;i+=16, lines--) {
+ for (i = 0; i < size && lines; i += 16, lines--) {
int limit;
limit = 16;
- if (i+limit > size)
- limit = size-i;
+ if (i + limit > size)
+ limit = size - i;
dump_line(realobj, i, limit);
}
}
@@ -1346,27 +1361,28 @@ static void check_poison_obj(kmem_cache_t *cachep, void *objp)
int size, i;
int lines = 0;
- realobj = (char*)objp+obj_dbghead(cachep);
+ realobj = (char *)objp + obj_dbghead(cachep);
size = obj_reallen(cachep);
- for (i=0;i<size;i++) {
+ for (i = 0; i < size; i++) {
char exp = POISON_FREE;
- if (i == size-1)
+ if (i == size - 1)
exp = POISON_END;
if (realobj[i] != exp) {
int limit;
/* Mismatch ! */
/* Print header */
if (lines == 0) {
- printk(KERN_ERR "Slab corruption: start=%p, len=%d\n",
- realobj, size);
+ printk(KERN_ERR
+ "Slab corruption: start=%p, len=%d\n",
+ realobj, size);
print_objinfo(cachep, objp, 0);
}
/* Hexdump the affected line */
- i = (i/16)*16;
+ i = (i / 16) * 16;
limit = 16;
- if (i+limit > size)
- limit = size-i;
+ if (i + limit > size)
+ limit = size - i;
dump_line(realobj, i, limit);
i += 16;
lines++;
@@ -1382,19 +1398,19 @@ static void check_poison_obj(kmem_cache_t *cachep, void *objp)
struct slab *slabp = page_get_slab(virt_to_page(objp));
int objnr;
- objnr = (objp-slabp->s_mem)/cachep->objsize;
+ objnr = (objp - slabp->s_mem) / cachep->objsize;
if (objnr) {
- objp = slabp->s_mem+(objnr-1)*cachep->objsize;
- realobj = (char*)objp+obj_dbghead(cachep);
+ objp = slabp->s_mem + (objnr - 1) * cachep->objsize;
+ realobj = (char *)objp + obj_dbghead(cachep);
printk(KERN_ERR "Prev obj: start=%p, len=%d\n",
- realobj, size);
+ realobj, size);
print_objinfo(cachep, objp, 2);
}
- if (objnr+1 < cachep->num) {
- objp = slabp->s_mem+(objnr+1)*cachep->objsize;
- realobj = (char*)objp+obj_dbghead(cachep);
+ if (objnr + 1 < cachep->num) {
+ objp = slabp->s_mem + (objnr + 1) * cachep->objsize;
+ realobj = (char *)objp + obj_dbghead(cachep);
printk(KERN_ERR "Next obj: start=%p, len=%d\n",
- realobj, size);
+ realobj, size);
print_objinfo(cachep, objp, 2);
}
}
@@ -1405,7 +1421,7 @@ static void check_poison_obj(kmem_cache_t *cachep, void *objp)
* Before calling the slab must have been unlinked from the cache.
* The cache-lock is not held/needed.
*/
-static void slab_destroy (kmem_cache_t *cachep, struct slab *slabp)
+static void slab_destroy(kmem_cache_t *cachep, struct slab *slabp)
{
void *addr = slabp->s_mem - slabp->colouroff;
@@ -1416,8 +1432,11 @@ static void slab_destroy (kmem_cache_t *cachep, struct slab *slabp)
if (cachep->flags & SLAB_POISON) {
#ifdef CONFIG_DEBUG_PAGEALLOC
- if ((cachep->objsize%PAGE_SIZE)==0 && OFF_SLAB(cachep))
- kernel_map_pages(virt_to_page(objp), cachep->objsize/PAGE_SIZE,1);
+ if ((cachep->objsize % PAGE_SIZE) == 0
+ && OFF_SLAB(cachep))
+ kernel_map_pages(virt_to_page(objp),
+ cachep->objsize / PAGE_SIZE,
+ 1);
else
check_poison_obj(cachep, objp);
#else
@@ -1427,20 +1446,20 @@ static void slab_destroy (kmem_cache_t *cachep, struct slab *slabp)
if (cachep->flags & SLAB_RED_ZONE) {
if (*dbg_redzone1(cachep, objp) != RED_INACTIVE)
slab_error(cachep, "start of a freed object "
- "was overwritten");
+ "was overwritten");
if (*dbg_redzone2(cachep, objp) != RED_INACTIVE)
slab_error(cachep, "end of a freed object "
- "was overwritten");
+ "was overwritten");
}
if (cachep->dtor && !(cachep->flags & SLAB_POISON))
- (cachep->dtor)(objp+obj_dbghead(cachep), cachep, 0);
+ (cachep->dtor) (objp + obj_dbghead(cachep), cachep, 0);
}
#else
if (cachep->dtor) {
int i;
for (i = 0; i < cachep->num; i++) {
- void* objp = slabp->s_mem+cachep->objsize*i;
- (cachep->dtor)(objp, cachep, 0);
+ void *objp = slabp->s_mem + cachep->objsize * i;
+ (cachep->dtor) (objp, cachep, 0);
}
}
#endif
@@ -1448,7 +1467,7 @@ static void slab_destroy (kmem_cache_t *cachep, struct slab *slabp)
if (unlikely(cachep->flags & SLAB_DESTROY_BY_RCU)) {
struct slab_rcu *slab_rcu;
- slab_rcu = (struct slab_rcu *) slabp;
+ slab_rcu = (struct slab_rcu *)slabp;
slab_rcu->cachep = cachep;
slab_rcu->addr = addr;
call_rcu(&slab_rcu->head, kmem_rcu_free);
@@ -1466,11 +1485,58 @@ static inline void set_up_list3s(kmem_cache_t *cachep, int index)
int node;
for_each_online_node(node) {
- cachep->nodelists[node] = &initkmem_list3[index+node];
+ cachep->nodelists[node] = &initkmem_list3[index + node];
cachep->nodelists[node]->next_reap = jiffies +
- REAPTIMEOUT_LIST3 +
- ((unsigned long)cachep)%REAPTIMEOUT_LIST3;
+ REAPTIMEOUT_LIST3 +
+ ((unsigned long)cachep) % REAPTIMEOUT_LIST3;
+ }
+}
+
+/**
+ * calculate_slab_order - calculate size (page order) of slabs and the number
+ * of objects per slab.
+ *
+ * This could be made much more intelligent. For now, try to avoid using
+ * high order pages for slabs. When the gfp() functions are more friendly
+ * towards high-order requests, this should be changed.
+ */
+static inline size_t calculate_slab_order(kmem_cache_t *cachep, size_t size,
+ size_t align, gfp_t flags)
+{
+ size_t left_over = 0;
+
+ for (;; cachep->gfporder++) {
+ unsigned int num;
+ size_t remainder;
+
+ if (cachep->gfporder > MAX_GFP_ORDER) {
+ cachep->num = 0;
+ break;
+ }
+
+ cache_estimate(cachep->gfporder, size, align, flags,
+ &remainder, &num);
+ if (!num)
+ continue;
+ /* More than offslab_limit objects will cause problems */
+ if (flags & CFLGS_OFF_SLAB && cachep->num > offslab_limit)
+ break;
+
+ cachep->num = num;
+ left_over = remainder;
+
+ /*
+ * Large number of objects is good, but very large slabs are
+ * currently bad for the gfp()s.
+ */
+ if (cachep->gfporder >= slab_break_gfp_order)
+ break;
+
+ if ((left_over * 8) <= (PAGE_SIZE << cachep->gfporder))
+ /* Acceptable internal fragmentation */
+ break;
}
+ return left_over;
}
/**
@@ -1519,16 +1585,15 @@ kmem_cache_create (const char *name, size_t size, size_t align,
* Sanity checks... these are all serious usage bugs.
*/
if ((!name) ||
- in_interrupt() ||
- (size < BYTES_PER_WORD) ||
- (size > (1<<MAX_OBJ_ORDER)*PAGE_SIZE) ||
- (dtor && !ctor)) {
- printk(KERN_ERR "%s: Early error in slab %s\n",
- __FUNCTION__, name);
- BUG();
- }
+ in_interrupt() ||
+ (size < BYTES_PER_WORD) ||
+ (size > (1 << MAX_OBJ_ORDER) * PAGE_SIZE) || (dtor && !ctor)) {
+ printk(KERN_ERR "%s: Early error in slab %s\n",
+ __FUNCTION__, name);
+ BUG();
+ }
- down(&cache_chain_sem);
+ mutex_lock(&cache_chain_mutex);
list_for_each(p, &cache_chain) {
kmem_cache_t *pc = list_entry(p, kmem_cache_t, next);
@@ -1546,11 +1611,11 @@ kmem_cache_create (const char *name, size_t size, size_t align,
set_fs(old_fs);
if (res) {
printk("SLAB: cache with size %d has lost its name\n",
- pc->objsize);
+ pc->objsize);
continue;
}
- if (!strcmp(pc->name,name)) {
+ if (!strcmp(pc->name, name)) {
printk("kmem_cache_create: duplicate cache %s\n", name);
dump_stack();
goto oops;
@@ -1562,10 +1627,9 @@ kmem_cache_create (const char *name, size_t size, size_t align,
if ((flags & SLAB_DEBUG_INITIAL) && !ctor) {
/* No constructor, but inital state check requested */
printk(KERN_ERR "%s: No con, but init state check "
- "requested - %s\n", __FUNCTION__, name);
+ "requested - %s\n", __FUNCTION__, name);
flags &= ~SLAB_DEBUG_INITIAL;
}
-
#if FORCED_DEBUG
/*
* Enable redzoning and last user accounting, except for caches with
@@ -1573,8 +1637,9 @@ kmem_cache_create (const char *name, size_t size, size_t align,
* above the next power of two: caches with object sizes just above a
* power of two have a significant amount of internal fragmentation.
*/
- if ((size < 4096 || fls(size-1) == fls(size-1+3*BYTES_PER_WORD)))
- flags |= SLAB_RED_ZONE|SLAB_STORE_USER;
+ if ((size < 4096
+ || fls(size - 1) == fls(size - 1 + 3 * BYTES_PER_WORD)))
+ flags |= SLAB_RED_ZONE | SLAB_STORE_USER;
if (!(flags & SLAB_DESTROY_BY_RCU))
flags |= SLAB_POISON;
#endif
@@ -1595,9 +1660,9 @@ kmem_cache_create (const char *name, size_t size, size_t align,
* unaligned accesses for some archs when redzoning is used, and makes
* sure any on-slab bufctl's are also correctly aligned.
*/
- if (size & (BYTES_PER_WORD-1)) {
- size += (BYTES_PER_WORD-1);
- size &= ~(BYTES_PER_WORD-1);
+ if (size & (BYTES_PER_WORD - 1)) {
+ size += (BYTES_PER_WORD - 1);
+ size &= ~(BYTES_PER_WORD - 1);
}
/* calculate out the final buffer alignment: */
@@ -1608,7 +1673,7 @@ kmem_cache_create (const char *name, size_t size, size_t align,
* objects into one cacheline.
*/
ralign = cache_line_size();
- while (size <= ralign/2)
+ while (size <= ralign / 2)
ralign /= 2;
} else {
ralign = BYTES_PER_WORD;
@@ -1617,13 +1682,13 @@ kmem_cache_create (const char *name, size_t size, size_t align,
if (ralign < ARCH_SLAB_MINALIGN) {
ralign = ARCH_SLAB_MINALIGN;
if (ralign > BYTES_PER_WORD)
- flags &= ~(SLAB_RED_ZONE|SLAB_STORE_USER);
+ flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER);
}
/* 3) caller mandated alignment: disables debug if necessary */
if (ralign < align) {
ralign = align;
if (ralign > BYTES_PER_WORD)
- flags &= ~(SLAB_RED_ZONE|SLAB_STORE_USER);
+ flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER);
}
/* 4) Store it. Note that the debug code below can reduce
* the alignment to BYTES_PER_WORD.
@@ -1645,7 +1710,7 @@ kmem_cache_create (const char *name, size_t size, size_t align,
/* add space for red zone words */
cachep->dbghead += BYTES_PER_WORD;
- size += 2*BYTES_PER_WORD;
+ size += 2 * BYTES_PER_WORD;
}
if (flags & SLAB_STORE_USER) {
/* user store requires word alignment and
@@ -1656,7 +1721,8 @@ kmem_cache_create (const char *name, size_t size, size_t align,
size += BYTES_PER_WORD;
}
#if FORCED_DEBUG && defined(CONFIG_DEBUG_PAGEALLOC)
- if (size >= malloc_sizes[INDEX_L3+1].cs_size && cachep->reallen > cache_line_size() && size < PAGE_SIZE) {
+ if (size >= malloc_sizes[INDEX_L3 + 1].cs_size
+ && cachep->reallen > cache_line_size() && size < PAGE_SIZE) {
cachep->dbghead += PAGE_SIZE - size;
size = PAGE_SIZE;
}
@@ -1664,7 +1730,7 @@ kmem_cache_create (const char *name, size_t size, size_t align,
#endif
/* Determine if the slab management is 'on' or 'off' slab. */
- if (size >= (PAGE_SIZE>>3))
+ if (size >= (PAGE_SIZE >> 3))
/*
* Size is large, assume best to place the slab management obj
* off-slab (should allow better packing of objs).
@@ -1681,47 +1747,9 @@ kmem_cache_create (const char *name, size_t size, size_t align,
*/
cachep->gfporder = 0;
cache_estimate(cachep->gfporder, size, align, flags,
- &left_over, &cachep->num);
- } else {
- /*
- * Calculate size (in pages) of slabs, and the num of objs per
- * slab. This could be made much more intelligent. For now,
- * try to avoid using high page-orders for slabs. When the
- * gfp() funcs are more friendly towards high-order requests,
- * this should be changed.
- */
- do {
- unsigned int break_flag = 0;
-cal_wastage:
- cache_estimate(cachep->gfporder, size, align, flags,
- &left_over, &cachep->num);
- if (break_flag)
- break;
- if (cachep->gfporder >= MAX_GFP_ORDER)
- break;
- if (!cachep->num)
- goto next;
- if (flags & CFLGS_OFF_SLAB &&
- cachep->num > offslab_limit) {
- /* This num of objs will cause problems. */
- cachep->gfporder--;
- break_flag++;
- goto cal_wastage;
- }
-
- /*
- * Large num of objs is good, but v. large slabs are
- * currently bad for the gfp()s.
- */
- if (cachep->gfporder >= slab_break_gfp_order)
- break;
-
- if ((left_over*8) <= (PAGE_SIZE<<cachep->gfporder))
- break; /* Acceptable internal fragmentation. */
-next:
- cachep->gfporder++;
- } while (1);
- }
+ &left_over, &cachep->num);
+ } else
+ left_over = calculate_slab_order(cachep, size, align, flags);
if (!cachep->num) {
printk("kmem_cache_create: couldn't create cache %s.\n", name);
@@ -1729,8 +1757,8 @@ next:
cachep = NULL;
goto oops;
}
- slab_size = ALIGN(cachep->num*sizeof(kmem_bufctl_t)
- + sizeof(struct slab), align);
+ slab_size = ALIGN(cachep->num * sizeof(kmem_bufctl_t)
+ + sizeof(struct slab), align);
/*
* If the slab has been placed off-slab, and we have enough space then
@@ -1743,14 +1771,15 @@ next:
if (flags & CFLGS_OFF_SLAB) {
/* really off slab. No need for manual alignment */
- slab_size = cachep->num*sizeof(kmem_bufctl_t)+sizeof(struct slab);
+ slab_size =
+ cachep->num * sizeof(kmem_bufctl_t) + sizeof(struct slab);
}
cachep->colour_off = cache_line_size();
/* Offset must be a multiple of the alignment. */
if (cachep->colour_off < align)
cachep->colour_off = align;
- cachep->colour = left_over/cachep->colour_off;
+ cachep->colour = left_over / cachep->colour_off;
cachep->slab_size = slab_size;
cachep->flags = flags;
cachep->gfpflags = 0;
@@ -1777,7 +1806,7 @@ next:
* the creation of further caches will BUG().
*/
cachep->array[smp_processor_id()] =
- &initarray_generic.cache;
+ &initarray_generic.cache;
/* If the cache that's used by
* kmalloc(sizeof(kmem_list3)) is the first cache,
@@ -1791,8 +1820,7 @@ next:
g_cpucache_up = PARTIAL_AC;
} else {
cachep->array[smp_processor_id()] =
- kmalloc(sizeof(struct arraycache_init),
- GFP_KERNEL);
+ kmalloc(sizeof(struct arraycache_init), GFP_KERNEL);
if (g_cpucache_up == PARTIAL_AC) {
set_up_list3s(cachep, SIZE_L3);
@@ -1802,16 +1830,18 @@ next:
for_each_online_node(node) {
cachep->nodelists[node] =
- kmalloc_node(sizeof(struct kmem_list3),
- GFP_KERNEL, node);
+ kmalloc_node(sizeof
+ (struct kmem_list3),
+ GFP_KERNEL, node);
BUG_ON(!cachep->nodelists[node]);
- kmem_list3_init(cachep->nodelists[node]);
+ kmem_list3_init(cachep->
+ nodelists[node]);
}
}
}
cachep->nodelists[numa_node_id()]->next_reap =
- jiffies + REAPTIMEOUT_LIST3 +
- ((unsigned long)cachep)%REAPTIMEOUT_LIST3;
+ jiffies + REAPTIMEOUT_LIST3 +
+ ((unsigned long)cachep) % REAPTIMEOUT_LIST3;
BUG_ON(!ac_data(cachep));
ac_data(cachep)->avail = 0;
@@ -1820,16 +1850,16 @@ next:
ac_data(cachep)->touched = 0;
cachep->batchcount = 1;
cachep->limit = BOOT_CPUCACHE_ENTRIES;
- }
+ }
/* cache setup completed, link it into the list */
list_add(&cachep->next, &cache_chain);
unlock_cpu_hotplug();
-oops:
+ oops:
if (!cachep && (flags & SLAB_PANIC))
panic("kmem_cache_create(): failed to create slab `%s'\n",
- name);
- up(&cache_chain_sem);
+ name);
+ mutex_unlock(&cache_chain_mutex);
return cachep;
}
EXPORT_SYMBOL(kmem_cache_create);
@@ -1871,7 +1901,7 @@ static inline void check_spinlock_acquired_node(kmem_cache_t *cachep, int node)
/*
* Waits for all CPUs to execute func().
*/
-static void smp_call_function_all_cpus(void (*func) (void *arg), void *arg)
+static void smp_call_function_all_cpus(void (*func)(void *arg), void *arg)
{
check_irq_on();
preempt_disable();
@@ -1886,12 +1916,12 @@ static void smp_call_function_all_cpus(void (*func) (void *arg), void *arg)
preempt_enable();
}
-static void drain_array_locked(kmem_cache_t* cachep,
- struct array_cache *ac, int force, int node);
+static void drain_array_locked(kmem_cache_t *cachep, struct array_cache *ac,
+ int force, int node);
static void do_drain(void *arg)
{
- kmem_cache_t *cachep = (kmem_cache_t*)arg;
+ kmem_cache_t *cachep = (kmem_cache_t *) arg;
struct array_cache *ac;
int node = numa_node_id();
@@ -1911,7 +1941,7 @@ static void drain_cpu_caches(kmem_cache_t *cachep)
smp_call_function_all_cpus(do_drain, cachep);
check_irq_on();
spin_lock_irq(&cachep->spinlock);
- for_each_online_node(node) {
+ for_each_online_node(node) {
l3 = cachep->nodelists[node];
if (l3) {
spin_lock(&l3->list_lock);
@@ -1949,8 +1979,7 @@ static int __node_shrink(kmem_cache_t *cachep, int node)
slab_destroy(cachep, slabp);
spin_lock_irq(&l3->list_lock);
}
- ret = !list_empty(&l3->slabs_full) ||
- !list_empty(&l3->slabs_partial);
+ ret = !list_empty(&l3->slabs_full) || !list_empty(&l3->slabs_partial);
return ret;
}
@@ -2006,7 +2035,7 @@ EXPORT_SYMBOL(kmem_cache_shrink);
* The caller must guarantee that noone will allocate memory from the cache
* during the kmem_cache_destroy().
*/
-int kmem_cache_destroy(kmem_cache_t * cachep)
+int kmem_cache_destroy(kmem_cache_t *cachep)
{
int i;
struct kmem_list3 *l3;
@@ -2018,18 +2047,18 @@ int kmem_cache_destroy(kmem_cache_t * cachep)
lock_cpu_hotplug();
/* Find the cache in the chain of caches. */
- down(&cache_chain_sem);
+ mutex_lock(&cache_chain_mutex);
/*
* the chain is never empty, cache_cache is never destroyed
*/
list_del(&cachep->next);
- up(&cache_chain_sem);
+ mutex_unlock(&cache_chain_mutex);
if (__cache_shrink(cachep)) {
slab_error(cachep, "Can't free all objects");
- down(&cache_chain_sem);
- list_add(&cachep->next,&cache_chain);
- up(&cache_chain_sem);
+ mutex_lock(&cache_chain_mutex);
+ list_add(&cachep->next, &cache_chain);
+ mutex_unlock(&cache_chain_mutex);
unlock_cpu_hotplug();
return 1;
}
@@ -2038,7 +2067,7 @@ int kmem_cache_destroy(kmem_cache_t * cachep)
synchronize_rcu();
for_each_online_cpu(i)
- kfree(cachep->array[i]);
+ kfree(cachep->array[i]);
/* NUMA: free the list3 structures */
for_each_online_node(i) {
@@ -2057,39 +2086,39 @@ int kmem_cache_destroy(kmem_cache_t * cachep)
EXPORT_SYMBOL(kmem_cache_destroy);
/* Get the memory for a slab management obj. */
-static struct slab* alloc_slabmgmt(kmem_cache_t *cachep, void *objp,
- int colour_off, gfp_t local_flags)
+static struct slab *alloc_slabmgmt(kmem_cache_t *cachep, void *objp,
+ int colour_off, gfp_t local_flags)
{
struct slab *slabp;
-
+
if (OFF_SLAB(cachep)) {
/* Slab management obj is off-slab. */
slabp = kmem_cache_alloc(cachep->slabp_cache, local_flags);
if (!slabp)
return NULL;
} else {
- slabp = objp+colour_off;
+ slabp = objp + colour_off;
colour_off += cachep->slab_size;
}
slabp->inuse = 0;
slabp->colouroff = colour_off;
- slabp->s_mem = objp+colour_off;
+ slabp->s_mem = objp + colour_off;
return slabp;
}
static inline kmem_bufctl_t *slab_bufctl(struct slab *slabp)
{
- return (kmem_bufctl_t *)(slabp+1);
+ return (kmem_bufctl_t *) (slabp + 1);
}
static void cache_init_objs(kmem_cache_t *cachep,
- struct slab *slabp, unsigned long ctor_flags)
+ struct slab *slabp, unsigned long ctor_flags)
{
int i;
for (i = 0; i < cachep->num; i++) {
- void *objp = slabp->s_mem+cachep->objsize*i;
+ void *objp = slabp->s_mem + cachep->objsize * i;
#if DEBUG
/* need to poison the objs? */
if (cachep->flags & SLAB_POISON)
@@ -2107,25 +2136,28 @@ static void cache_init_objs(kmem_cache_t *cachep,
* Otherwise, deadlock. They must also be threaded.
*/
if (cachep->ctor && !(cachep->flags & SLAB_POISON))
- cachep->ctor(objp+obj_dbghead(cachep), cachep, ctor_flags);
+ cachep->ctor(objp + obj_dbghead(cachep), cachep,
+ ctor_flags);
if (cachep->flags & SLAB_RED_ZONE) {
if (*dbg_redzone2(cachep, objp) != RED_INACTIVE)
slab_error(cachep, "constructor overwrote the"
- " end of an object");
+ " end of an object");
if (*dbg_redzone1(cachep, objp) != RED_INACTIVE)
slab_error(cachep, "constructor overwrote the"
- " start of an object");
+ " start of an object");
}
- if ((cachep->objsize % PAGE_SIZE) == 0 && OFF_SLAB(cachep) && cachep->flags & SLAB_POISON)
- kernel_map_pages(virt_to_page(objp), cachep->objsize/PAGE_SIZE, 0);
+ if ((cachep->objsize % PAGE_SIZE) == 0 && OFF_SLAB(cachep)
+ && cachep->flags & SLAB_POISON)
+ kernel_map_pages(virt_to_page(objp),
+ cachep->objsize / PAGE_SIZE, 0);
#else
if (cachep->ctor)
cachep->ctor(objp, cachep, ctor_flags);
#endif
- slab_bufctl(slabp)[i] = i+1;
+ slab_bufctl(slabp)[i] = i + 1;
}
- slab_bufctl(slabp)[i-1] = BUFCTL_END;
+ slab_bufctl(slabp)[i - 1] = BUFCTL_END;
slabp->free = 0;
}
@@ -2161,17 +2193,17 @@ static void set_slab_attr(kmem_cache_t *cachep, struct slab *slabp, void *objp)
*/
static int cache_grow(kmem_cache_t *cachep, gfp_t flags, int nodeid)
{
- struct slab *slabp;
- void *objp;
- size_t offset;
- gfp_t local_flags;
- unsigned long ctor_flags;
+ struct slab *slabp;
+ void *objp;
+ size_t offset;
+ gfp_t local_flags;
+ unsigned long ctor_flags;
struct kmem_list3 *l3;
/* Be lazy and only check for valid flags here,
- * keeping it out of the critical path in kmem_cache_alloc().
+ * keeping it out of the critical path in kmem_cache_alloc().
*/
- if (flags & ~(SLAB_DMA|SLAB_LEVEL_MASK|SLAB_NO_GROW))
+ if (flags & ~(SLAB_DMA | SLAB_LEVEL_MASK | SLAB_NO_GROW))
BUG();
if (flags & SLAB_NO_GROW)
return 0;
@@ -2237,9 +2269,9 @@ static int cache_grow(kmem_cache_t *cachep, gfp_t flags, int nodeid)
l3->free_objects += cachep->num;
spin_unlock(&l3->list_lock);
return 1;
-opps1:
+ opps1:
kmem_freepages(cachep, objp);
-failed:
+ failed:
if (local_flags & __GFP_WAIT)
local_irq_disable();
return 0;
@@ -2259,18 +2291,19 @@ static void kfree_debugcheck(const void *objp)
if (!virt_addr_valid(objp)) {
printk(KERN_ERR "kfree_debugcheck: out of range ptr %lxh.\n",
- (unsigned long)objp);
- BUG();
+ (unsigned long)objp);
+ BUG();
}
page = virt_to_page(objp);
if (!PageSlab(page)) {
- printk(KERN_ERR "kfree_debugcheck: bad ptr %lxh.\n", (unsigned long)objp);
+ printk(KERN_ERR "kfree_debugcheck: bad ptr %lxh.\n",
+ (unsigned long)objp);
BUG();
}
}
static void *cache_free_debugcheck(kmem_cache_t *cachep, void *objp,
- void *caller)
+ void *caller)
{
struct page *page;
unsigned int objnr;
@@ -2281,20 +2314,26 @@ static void *cache_free_debugcheck(kmem_cache_t *cachep, void *objp,
page = virt_to_page(objp);
if (page_get_cache(page) != cachep) {
- printk(KERN_ERR "mismatch in kmem_cache_free: expected cache %p, got %p\n",
- page_get_cache(page),cachep);
+ printk(KERN_ERR
+ "mismatch in kmem_cache_free: expected cache %p, got %p\n",
+ page_get_cache(page), cachep);
printk(KERN_ERR "%p is %s.\n", cachep, cachep->name);
- printk(KERN_ERR "%p is %s.\n", page_get_cache(page), page_get_cache(page)->name);
+ printk(KERN_ERR "%p is %s.\n", page_get_cache(page),
+ page_get_cache(page)->name);
WARN_ON(1);
}
slabp = page_get_slab(page);
if (cachep->flags & SLAB_RED_ZONE) {
- if (*dbg_redzone1(cachep, objp) != RED_ACTIVE || *dbg_redzone2(cachep, objp) != RED_ACTIVE) {
- slab_error(cachep, "double free, or memory outside"
- " object was overwritten");
- printk(KERN_ERR "%p: redzone 1: 0x%lx, redzone 2: 0x%lx.\n",
- objp, *dbg_redzone1(cachep, objp), *dbg_redzone2(cachep, objp));
+ if (*dbg_redzone1(cachep, objp) != RED_ACTIVE
+ || *dbg_redzone2(cachep, objp) != RED_ACTIVE) {
+ slab_error(cachep,
+ "double free, or memory outside"
+ " object was overwritten");
+ printk(KERN_ERR
+ "%p: redzone 1: 0x%lx, redzone 2: 0x%lx.\n",
+ objp, *dbg_redzone1(cachep, objp),
+ *dbg_redzone2(cachep, objp));
}
*dbg_redzone1(cachep, objp) = RED_INACTIVE;
*dbg_redzone2(cachep, objp) = RED_INACTIVE;
@@ -2302,30 +2341,31 @@ static void *cache_free_debugcheck(kmem_cache_t *cachep, void *objp,
if (cachep->flags & SLAB_STORE_USER)
*dbg_userword(cachep, objp) = caller;
- objnr = (objp-slabp->s_mem)/cachep->objsize;
+ objnr = (objp - slabp->s_mem) / cachep->objsize;
BUG_ON(objnr >= cachep->num);
- BUG_ON(objp != slabp->s_mem + objnr*cachep->objsize);
+ BUG_ON(objp != slabp->s_mem + objnr * cachep->objsize);
if (cachep->flags & SLAB_DEBUG_INITIAL) {
/* Need to call the slab's constructor so the
* caller can perform a verify of its state (debugging).
* Called without the cache-lock held.
*/
- cachep->ctor(objp+obj_dbghead(cachep),
- cachep, SLAB_CTOR_CONSTRUCTOR|SLAB_CTOR_VERIFY);
+ cachep->ctor(objp + obj_dbghead(cachep),
+ cachep, SLAB_CTOR_CONSTRUCTOR | SLAB_CTOR_VERIFY);
}
if (cachep->flags & SLAB_POISON && cachep->dtor) {
/* we want to cache poison the object,
* call the destruction callback
*/
- cachep->dtor(objp+obj_dbghead(cachep), cachep, 0);
+ cachep->dtor(objp + obj_dbghead(cachep), cachep, 0);
}
if (cachep->flags & SLAB_POISON) {
#ifdef CONFIG_DEBUG_PAGEALLOC
if ((cachep->objsize % PAGE_SIZE) == 0 && OFF_SLAB(cachep)) {
store_stackinfo(cachep, objp, (unsigned long)caller);
- kernel_map_pages(virt_to_page(objp), cachep->objsize/PAGE_SIZE, 0);
+ kernel_map_pages(virt_to_page(objp),
+ cachep->objsize / PAGE_SIZE, 0);
} else {
poison_obj(cachep, objp, POISON_FREE);
}
@@ -2340,7 +2380,7 @@ static void check_slabp(kmem_cache_t *cachep, struct slab *slabp)
{
kmem_bufctl_t i;
int entries = 0;
-
+
/* Check slab's freelist to see if this obj is there. */
for (i = slabp->free; i != BUFCTL_END; i = slab_bufctl(slabp)[i]) {
entries++;
@@ -2348,13 +2388,16 @@ static void check_slabp(kmem_cache_t *cachep, struct slab *slabp)
goto bad;
}
if (entries != cachep->num - slabp->inuse) {
-bad:
- printk(KERN_ERR "slab: Internal list corruption detected in cache '%s'(%d), slabp %p(%d). Hexdump:\n",
- cachep->name, cachep->num, slabp, slabp->inuse);
- for (i=0;i<sizeof(slabp)+cachep->num*sizeof(kmem_bufctl_t);i++) {
- if ((i%16)==0)
+ bad:
+ printk(KERN_ERR
+ "slab: Internal list corruption detected in cache '%s'(%d), slabp %p(%d). Hexdump:\n",
+ cachep->name, cachep->num, slabp, slabp->inuse);
+ for (i = 0;
+ i < sizeof(slabp) + cachep->num * sizeof(kmem_bufctl_t);
+ i++) {
+ if ((i % 16) == 0)
printk("\n%03x:", i);
- printk(" %02x", ((unsigned char*)slabp)[i]);
+ printk(" %02x", ((unsigned char *)slabp)[i]);
}
printk("\n");
BUG();
@@ -2374,7 +2417,7 @@ static void *cache_alloc_refill(kmem_cache_t *cachep, gfp_t flags)
check_irq_off();
ac = ac_data(cachep);
-retry:
+ retry:
batchcount = ac->batchcount;
if (!ac->touched && batchcount > BATCHREFILL_LIMIT) {
/* if there was little recent activity on this
@@ -2396,8 +2439,8 @@ retry:
shared_array->avail -= batchcount;
ac->avail = batchcount;
memcpy(ac->entry,
- &(shared_array->entry[shared_array->avail]),
- sizeof(void*)*batchcount);
+ &(shared_array->entry[shared_array->avail]),
+ sizeof(void *) * batchcount);
shared_array->touched = 1;
goto alloc_done;
}
@@ -2425,7 +2468,7 @@ retry:
/* get obj pointer */
ac->entry[ac->avail++] = slabp->s_mem +
- slabp->free*cachep->objsize;
+ slabp->free * cachep->objsize;
slabp->inuse++;
next = slab_bufctl(slabp)[slabp->free];
@@ -2433,7 +2476,7 @@ retry:
slab_bufctl(slabp)[slabp->free] = BUFCTL_FREE;
WARN_ON(numa_node_id() != slabp->nodeid);
#endif
- slabp->free = next;
+ slabp->free = next;
}
check_slabp(cachep, slabp);
@@ -2445,9 +2488,9 @@ retry:
list_add(&slabp->list, &l3->slabs_partial);
}
-must_grow:
+ must_grow:
l3->free_objects -= ac->avail;
-alloc_done:
+ alloc_done:
spin_unlock(&l3->list_lock);
if (unlikely(!ac->avail)) {
@@ -2459,7 +2502,7 @@ alloc_done:
if (!x && ac->avail == 0) // no objects in sight? abort
return NULL;
- if (!ac->avail) // objects refilled by interrupt?
+ if (!ac->avail) // objects refilled by interrupt?
goto retry;
}
ac->touched = 1;
@@ -2476,16 +2519,16 @@ cache_alloc_debugcheck_before(kmem_cache_t *cachep, gfp_t flags)
}
#if DEBUG
-static void *
-cache_alloc_debugcheck_after(kmem_cache_t *cachep,
- gfp_t flags, void *objp, void *caller)
+static void *cache_alloc_debugcheck_after(kmem_cache_t *cachep, gfp_t flags,
+ void *objp, void *caller)
{
- if (!objp)
+ if (!objp)
return objp;
- if (cachep->flags & SLAB_POISON) {
+ if (cachep->flags & SLAB_POISON) {
#ifdef CONFIG_DEBUG_PAGEALLOC
if ((cachep->objsize % PAGE_SIZE) == 0 && OFF_SLAB(cachep))
- kernel_map_pages(virt_to_page(objp), cachep->objsize/PAGE_SIZE, 1);
+ kernel_map_pages(virt_to_page(objp),
+ cachep->objsize / PAGE_SIZE, 1);
else
check_poison_obj(cachep, objp);
#else
@@ -2497,24 +2540,28 @@ cache_alloc_debugcheck_after(kmem_cache_t *cachep,
*dbg_userword(cachep, objp) = caller;
if (cachep->flags & SLAB_RED_ZONE) {
- if (*dbg_redzone1(cachep, objp) != RED_INACTIVE || *dbg_redzone2(cachep, objp) != RED_INACTIVE) {
- slab_error(cachep, "double free, or memory outside"
- " object was overwritten");
- printk(KERN_ERR "%p: redzone 1: 0x%lx, redzone 2: 0x%lx.\n",
- objp, *dbg_redzone1(cachep, objp), *dbg_redzone2(cachep, objp));
+ if (*dbg_redzone1(cachep, objp) != RED_INACTIVE
+ || *dbg_redzone2(cachep, objp) != RED_INACTIVE) {
+ slab_error(cachep,
+ "double free, or memory outside"
+ " object was overwritten");
+ printk(KERN_ERR
+ "%p: redzone 1: 0x%lx, redzone 2: 0x%lx.\n",
+ objp, *dbg_redzone1(cachep, objp),
+ *dbg_redzone2(cachep, objp));
}
*dbg_redzone1(cachep, objp) = RED_ACTIVE;
*dbg_redzone2(cachep, objp) = RED_ACTIVE;
}
objp += obj_dbghead(cachep);
if (cachep->ctor && cachep->flags & SLAB_POISON) {
- unsigned long ctor_flags = SLAB_CTOR_CONSTRUCTOR;
+ unsigned long ctor_flags = SLAB_CTOR_CONSTRUCTOR;
if (!(flags & __GFP_WAIT))
ctor_flags |= SLAB_CTOR_ATOMIC;
cachep->ctor(objp, cachep, ctor_flags);
- }
+ }
return objp;
}
#else
@@ -2523,9 +2570,18 @@ cache_alloc_debugcheck_after(kmem_cache_t *cachep,
static inline void *____cache_alloc(kmem_cache_t *cachep, gfp_t flags)
{
- void* objp;
+ void *objp;
struct array_cache *ac;
+#ifdef CONFIG_NUMA
+ if (unlikely(current->mempolicy && !in_interrupt())) {
+ int nid = slab_node(current->mempolicy);
+
+ if (nid != numa_node_id())
+ return __cache_alloc_node(cachep, flags, nid);
+ }
+#endif
+
check_irq_off();
ac = ac_data(cachep);
if (likely(ac->avail)) {
@@ -2542,7 +2598,7 @@ static inline void *____cache_alloc(kmem_cache_t *cachep, gfp_t flags)
static inline void *__cache_alloc(kmem_cache_t *cachep, gfp_t flags)
{
unsigned long save_flags;
- void* objp;
+ void *objp;
cache_alloc_debugcheck_before(cachep, flags);
@@ -2550,7 +2606,7 @@ static inline void *__cache_alloc(kmem_cache_t *cachep, gfp_t flags)
objp = ____cache_alloc(cachep, flags);
local_irq_restore(save_flags);
objp = cache_alloc_debugcheck_after(cachep, flags, objp,
- __builtin_return_address(0));
+ __builtin_return_address(0));
prefetchw(objp);
return objp;
}
@@ -2562,74 +2618,75 @@ static inline void *__cache_alloc(kmem_cache_t *cachep, gfp_t flags)
static void *__cache_alloc_node(kmem_cache_t *cachep, gfp_t flags, int nodeid)
{
struct list_head *entry;
- struct slab *slabp;
- struct kmem_list3 *l3;
- void *obj;
- kmem_bufctl_t next;
- int x;
-
- l3 = cachep->nodelists[nodeid];
- BUG_ON(!l3);
-
-retry:
- spin_lock(&l3->list_lock);
- entry = l3->slabs_partial.next;
- if (entry == &l3->slabs_partial) {
- l3->free_touched = 1;
- entry = l3->slabs_free.next;
- if (entry == &l3->slabs_free)
- goto must_grow;
- }
-
- slabp = list_entry(entry, struct slab, list);
- check_spinlock_acquired_node(cachep, nodeid);
- check_slabp(cachep, slabp);
-
- STATS_INC_NODEALLOCS(cachep);
- STATS_INC_ACTIVE(cachep);
- STATS_SET_HIGH(cachep);
-
- BUG_ON(slabp->inuse == cachep->num);
-
- /* get obj pointer */
- obj = slabp->s_mem + slabp->free*cachep->objsize;
- slabp->inuse++;
- next = slab_bufctl(slabp)[slabp->free];
+ struct slab *slabp;
+ struct kmem_list3 *l3;
+ void *obj;
+ kmem_bufctl_t next;
+ int x;
+
+ l3 = cachep->nodelists[nodeid];
+ BUG_ON(!l3);
+
+ retry:
+ spin_lock(&l3->list_lock);
+ entry = l3->slabs_partial.next;
+ if (entry == &l3->slabs_partial) {
+ l3->free_touched = 1;
+ entry = l3->slabs_free.next;
+ if (entry == &l3->slabs_free)
+ goto must_grow;
+ }
+
+ slabp = list_entry(entry, struct slab, list);
+ check_spinlock_acquired_node(cachep, nodeid);
+ check_slabp(cachep, slabp);
+
+ STATS_INC_NODEALLOCS(cachep);
+ STATS_INC_ACTIVE(cachep);
+ STATS_SET_HIGH(cachep);
+
+ BUG_ON(slabp->inuse == cachep->num);
+
+ /* get obj pointer */
+ obj = slabp->s_mem + slabp->free * cachep->objsize;
+ slabp->inuse++;
+ next = slab_bufctl(slabp)[slabp->free];
#if DEBUG
- slab_bufctl(slabp)[slabp->free] = BUFCTL_FREE;
+ slab_bufctl(slabp)[slabp->free] = BUFCTL_FREE;
#endif
- slabp->free = next;
- check_slabp(cachep, slabp);
- l3->free_objects--;
- /* move slabp to correct slabp list: */
- list_del(&slabp->list);
-
- if (slabp->free == BUFCTL_END) {
- list_add(&slabp->list, &l3->slabs_full);
- } else {
- list_add(&slabp->list, &l3->slabs_partial);
- }
+ slabp->free = next;
+ check_slabp(cachep, slabp);
+ l3->free_objects--;
+ /* move slabp to correct slabp list: */
+ list_del(&slabp->list);
+
+ if (slabp->free == BUFCTL_END) {
+ list_add(&slabp->list, &l3->slabs_full);
+ } else {
+ list_add(&slabp->list, &l3->slabs_partial);
+ }
- spin_unlock(&l3->list_lock);
- goto done;
+ spin_unlock(&l3->list_lock);
+ goto done;
-must_grow:
- spin_unlock(&l3->list_lock);
- x = cache_grow(cachep, flags, nodeid);
+ must_grow:
+ spin_unlock(&l3->list_lock);
+ x = cache_grow(cachep, flags, nodeid);
- if (!x)
- return NULL;
+ if (!x)
+ return NULL;
- goto retry;
-done:
- return obj;
+ goto retry;
+ done:
+ return obj;
}
#endif
/*
* Caller needs to acquire correct kmem_list's list_lock
*/
-static void free_block(kmem_cache_t *cachep, void **objpp, int nr_objects, int node)
+static void free_block(kmem_cache_t *cachep, void **objpp, int nr_objects,
+ int node)
{
int i;
struct kmem_list3 *l3;
@@ -2652,7 +2709,7 @@ static void free_block(kmem_cache_t *cachep, void **objpp, int nr_objects, int n
if (slab_bufctl(slabp)[objnr] != BUFCTL_FREE) {
printk(KERN_ERR "slab: double free detected in cache "
- "'%s', objp %p\n", cachep->name, objp);
+ "'%s', objp %p\n", cachep->name, objp);
BUG();
}
#endif
@@ -2696,20 +2753,19 @@ static void cache_flusharray(kmem_cache_t *cachep, struct array_cache *ac)
spin_lock(&l3->list_lock);
if (l3->shared) {
struct array_cache *shared_array = l3->shared;
- int max = shared_array->limit-shared_array->avail;
+ int max = shared_array->limit - shared_array->avail;
if (max) {
if (batchcount > max)
batchcount = max;
memcpy(&(shared_array->entry[shared_array->avail]),
- ac->entry,
- sizeof(void*)*batchcount);
+ ac->entry, sizeof(void *) * batchcount);
shared_array->avail += batchcount;
goto free_done;
}
}
free_block(cachep, ac->entry, batchcount, node);
-free_done:
+ free_done:
#if STATS
{
int i = 0;
@@ -2731,10 +2787,9 @@ free_done:
spin_unlock(&l3->list_lock);
ac->avail -= batchcount;
memmove(ac->entry, &(ac->entry[batchcount]),
- sizeof(void*)*ac->avail);
+ sizeof(void *) * ac->avail);
}
-
/*
* __cache_free
* Release an obj back to its cache. If the obj has a constructed
@@ -2759,7 +2814,8 @@ static inline void __cache_free(kmem_cache_t *cachep, void *objp)
if (unlikely(slabp->nodeid != numa_node_id())) {
struct array_cache *alien = NULL;
int nodeid = slabp->nodeid;
- struct kmem_list3 *l3 = cachep->nodelists[numa_node_id()];
+ struct kmem_list3 *l3 =
+ cachep->nodelists[numa_node_id()];
STATS_INC_NODEFREES(cachep);
if (l3->alien && l3->alien[nodeid]) {
@@ -2767,15 +2823,15 @@ static inline void __cache_free(kmem_cache_t *cachep, void *objp)
spin_lock(&alien->lock);
if (unlikely(alien->avail == alien->limit))
__drain_alien_cache(cachep,
- alien, nodeid);
+ alien, nodeid);
alien->entry[alien->avail++] = objp;
spin_unlock(&alien->lock);
} else {
spin_lock(&(cachep->nodelists[nodeid])->
- list_lock);
+ list_lock);
free_block(cachep, &objp, 1, nodeid);
spin_unlock(&(cachep->nodelists[nodeid])->
- list_lock);
+ list_lock);
}
return;
}
@@ -2822,9 +2878,9 @@ EXPORT_SYMBOL(kmem_cache_alloc);
*/
int fastcall kmem_ptr_validate(kmem_cache_t *cachep, void *ptr)
{
- unsigned long addr = (unsigned long) ptr;
+ unsigned long addr = (unsigned long)ptr;
unsigned long min_addr = PAGE_OFFSET;
- unsigned long align_mask = BYTES_PER_WORD-1;
+ unsigned long align_mask = BYTES_PER_WORD - 1;
unsigned long size = cachep->objsize;
struct page *page;
@@ -2844,7 +2900,7 @@ int fastcall kmem_ptr_validate(kmem_cache_t *cachep, void *ptr)
if (unlikely(page_get_cache(page) != cachep))
goto out;
return 1;
-out:
+ out:
return 0;
}
@@ -2871,8 +2927,10 @@ void *kmem_cache_alloc_node(kmem_cache_t *cachep, gfp_t flags, int nodeid)
if (unlikely(!cachep->nodelists[nodeid])) {
/* Fall back to __cache_alloc if we run into trouble */
- printk(KERN_WARNING "slab: not allocating in inactive node %d for cache %s\n", nodeid, cachep->name);
- return __cache_alloc(cachep,flags);
+ printk(KERN_WARNING
+ "slab: not allocating in inactive node %d for cache %s\n",
+ nodeid, cachep->name);
+ return __cache_alloc(cachep, flags);
}
cache_alloc_debugcheck_before(cachep, flags);
@@ -2882,7 +2940,9 @@ void *kmem_cache_alloc_node(kmem_cache_t *cachep, gfp_t flags, int nodeid)
else
ptr = __cache_alloc_node(cachep, flags, nodeid);
local_irq_restore(save_flags);
- ptr = cache_alloc_debugcheck_after(cachep, flags, ptr, __builtin_return_address(0));
+ ptr =
+ cache_alloc_debugcheck_after(cachep, flags, ptr,
+ __builtin_return_address(0));
return ptr;
}
@@ -2944,12 +3004,11 @@ EXPORT_SYMBOL(__kmalloc);
* Objects should be dereferenced using the per_cpu_ptr macro only.
*
* @size: how many bytes of memory are required.
- * @align: the alignment, which can't be greater than SMP_CACHE_BYTES.
*/
-void *__alloc_percpu(size_t size, size_t align)
+void *__alloc_percpu(size_t size)
{
int i;
- struct percpu_data *pdata = kmalloc(sizeof (*pdata), GFP_KERNEL);
+ struct percpu_data *pdata = kmalloc(sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return NULL;
@@ -2973,9 +3032,9 @@ void *__alloc_percpu(size_t size, size_t align)
}
/* Catch derefs w/o wrappers */
- return (void *) (~(unsigned long) pdata);
+ return (void *)(~(unsigned long)pdata);
-unwind_oom:
+ unwind_oom:
while (--i >= 0) {
if (!cpu_possible(i))
continue;
@@ -3006,20 +3065,6 @@ void kmem_cache_free(kmem_cache_t *cachep, void *objp)
EXPORT_SYMBOL(kmem_cache_free);
/**
- * kzalloc - allocate memory. The memory is set to zero.
- * @size: how many bytes of memory are required.
- * @flags: the type of memory to allocate.
- */
-void *kzalloc(size_t size, gfp_t flags)
-{
- void *ret = kmalloc(size, flags);
- if (ret)
- memset(ret, 0, size);
- return ret;
-}
-EXPORT_SYMBOL(kzalloc);
-
-/**
* kfree - free previously allocated memory
* @objp: pointer returned by kmalloc.
*
@@ -3038,7 +3083,8 @@ void kfree(const void *objp)
local_irq_save(flags);
kfree_debugcheck(objp);
c = page_get_cache(virt_to_page(objp));
- __cache_free(c, (void*)objp);
+ mutex_debug_check_no_locks_freed(objp, obj_reallen(c));
+ __cache_free(c, (void *)objp);
local_irq_restore(flags);
}
EXPORT_SYMBOL(kfree);
@@ -3051,17 +3097,16 @@ EXPORT_SYMBOL(kfree);
* Don't free memory not originally allocated by alloc_percpu()
* The complemented objp is to check for that.
*/
-void
-free_percpu(const void *objp)
+void free_percpu(const void *objp)
{
int i;
- struct percpu_data *p = (struct percpu_data *) (~(unsigned long) objp);
+ struct percpu_data *p = (struct percpu_data *)(~(unsigned long)objp);
/*
* We allocate for all cpus so we cannot use for online cpu here.
*/
for_each_cpu(i)
- kfree(p->ptrs[i]);
+ kfree(p->ptrs[i]);
kfree(p);
}
EXPORT_SYMBOL(free_percpu);
@@ -3095,44 +3140,44 @@ static int alloc_kmemlist(kmem_cache_t *cachep)
if (!(new_alien = alloc_alien_cache(node, cachep->limit)))
goto fail;
#endif
- if (!(new = alloc_arraycache(node, (cachep->shared*
- cachep->batchcount), 0xbaadf00d)))
+ if (!(new = alloc_arraycache(node, (cachep->shared *
+ cachep->batchcount),
+ 0xbaadf00d)))
goto fail;
if ((l3 = cachep->nodelists[node])) {
spin_lock_irq(&l3->list_lock);
if ((nc = cachep->nodelists[node]->shared))
- free_block(cachep, nc->entry,
- nc->avail, node);
+ free_block(cachep, nc->entry, nc->avail, node);
l3->shared = new;
if (!cachep->nodelists[node]->alien) {
l3->alien = new_alien;
new_alien = NULL;
}
- l3->free_limit = (1 + nr_cpus_node(node))*
- cachep->batchcount + cachep->num;
+ l3->free_limit = (1 + nr_cpus_node(node)) *
+ cachep->batchcount + cachep->num;
spin_unlock_irq(&l3->list_lock);
kfree(nc);
free_alien_cache(new_alien);
continue;
}
if (!(l3 = kmalloc_node(sizeof(struct kmem_list3),
- GFP_KERNEL, node)))
+ GFP_KERNEL, node)))
goto fail;
kmem_list3_init(l3);
l3->next_reap = jiffies + REAPTIMEOUT_LIST3 +
- ((unsigned long)cachep)%REAPTIMEOUT_LIST3;
+ ((unsigned long)cachep) % REAPTIMEOUT_LIST3;
l3->shared = new;
l3->alien = new_alien;
- l3->free_limit = (1 + nr_cpus_node(node))*
- cachep->batchcount + cachep->num;
+ l3->free_limit = (1 + nr_cpus_node(node)) *
+ cachep->batchcount + cachep->num;
cachep->nodelists[node] = l3;
}
return err;
-fail:
+ fail:
err = -ENOMEM;
return err;
}
@@ -3154,18 +3199,19 @@ static void do_ccupdate_local(void *info)
new->new[smp_processor_id()] = old;
}
-
static int do_tune_cpucache(kmem_cache_t *cachep, int limit, int batchcount,
- int shared)
+ int shared)
{
struct ccupdate_struct new;
int i, err;
- memset(&new.new,0,sizeof(new.new));
+ memset(&new.new, 0, sizeof(new.new));
for_each_online_cpu(i) {
- new.new[i] = alloc_arraycache(cpu_to_node(i), limit, batchcount);
+ new.new[i] =
+ alloc_arraycache(cpu_to_node(i), limit, batchcount);
if (!new.new[i]) {
- for (i--; i >= 0; i--) kfree(new.new[i]);
+ for (i--; i >= 0; i--)
+ kfree(new.new[i]);
return -ENOMEM;
}
}
@@ -3193,13 +3239,12 @@ static int do_tune_cpucache(kmem_cache_t *cachep, int limit, int batchcount,
err = alloc_kmemlist(cachep);
if (err) {
printk(KERN_ERR "alloc_kmemlist failed for %s, error %d.\n",
- cachep->name, -err);
+ cachep->name, -err);
BUG();
}
return 0;
}
-
static void enable_cpucache(kmem_cache_t *cachep)
{
int err;
@@ -3246,14 +3291,14 @@ static void enable_cpucache(kmem_cache_t *cachep)
if (limit > 32)
limit = 32;
#endif
- err = do_tune_cpucache(cachep, limit, (limit+1)/2, shared);
+ err = do_tune_cpucache(cachep, limit, (limit + 1) / 2, shared);
if (err)
printk(KERN_ERR "enable_cpucache failed for %s, error %d.\n",
- cachep->name, -err);
+ cachep->name, -err);
}
-static void drain_array_locked(kmem_cache_t *cachep,
- struct array_cache *ac, int force, int node)
+static void drain_array_locked(kmem_cache_t *cachep, struct array_cache *ac,
+ int force, int node)
{
int tofree;
@@ -3261,14 +3306,14 @@ static void drain_array_locked(kmem_cache_t *cachep,
if (ac->touched && !force) {
ac->touched = 0;
} else if (ac->avail) {
- tofree = force ? ac->avail : (ac->limit+4)/5;
+ tofree = force ? ac->avail : (ac->limit + 4) / 5;
if (tofree > ac->avail) {
- tofree = (ac->avail+1)/2;
+ tofree = (ac->avail + 1) / 2;
}
free_block(cachep, ac->entry, tofree, node);
ac->avail -= tofree;
memmove(ac->entry, &(ac->entry[tofree]),
- sizeof(void*)*ac->avail);
+ sizeof(void *) * ac->avail);
}
}
@@ -3281,7 +3326,7 @@ static void drain_array_locked(kmem_cache_t *cachep,
* - clear the per-cpu caches for this CPU.
* - return freeable pages to the main free memory pool.
*
- * If we cannot acquire the cache chain semaphore then just give up - we'll
+ * If we cannot acquire the cache chain mutex then just give up - we'll
* try again on the next iteration.
*/
static void cache_reap(void *unused)
@@ -3289,15 +3334,16 @@ static void cache_reap(void *unused)
struct list_head *walk;
struct kmem_list3 *l3;
- if (down_trylock(&cache_chain_sem)) {
+ if (!mutex_trylock(&cache_chain_mutex)) {
/* Give up. Setup the next iteration. */
- schedule_delayed_work(&__get_cpu_var(reap_work), REAPTIMEOUT_CPUC);
+ schedule_delayed_work(&__get_cpu_var(reap_work),
+ REAPTIMEOUT_CPUC);
return;
}
list_for_each(walk, &cache_chain) {
kmem_cache_t *searchp;
- struct list_head* p;
+ struct list_head *p;
int tofree;
struct slab *slabp;
@@ -3314,7 +3360,7 @@ static void cache_reap(void *unused)
spin_lock_irq(&l3->list_lock);
drain_array_locked(searchp, ac_data(searchp), 0,
- numa_node_id());
+ numa_node_id());
if (time_after(l3->next_reap, jiffies))
goto next_unlock;
@@ -3323,14 +3369,16 @@ static void cache_reap(void *unused)
if (l3->shared)
drain_array_locked(searchp, l3->shared, 0,
- numa_node_id());
+ numa_node_id());
if (l3->free_touched) {
l3->free_touched = 0;
goto next_unlock;
}
- tofree = (l3->free_limit+5*searchp->num-1)/(5*searchp->num);
+ tofree =
+ (l3->free_limit + 5 * searchp->num -
+ 1) / (5 * searchp->num);
do {
p = l3->slabs_free.next;
if (p == &(l3->slabs_free))
@@ -3350,14 +3398,14 @@ static void cache_reap(void *unused)
spin_unlock_irq(&l3->list_lock);
slab_destroy(searchp, slabp);
spin_lock_irq(&l3->list_lock);
- } while(--tofree > 0);
-next_unlock:
+ } while (--tofree > 0);
+ next_unlock:
spin_unlock_irq(&l3->list_lock);
-next:
+ next:
cond_resched();
}
check_irq_on();
- up(&cache_chain_sem);
+ mutex_unlock(&cache_chain_mutex);
drain_remote_pages();
/* Setup the next iteration */
schedule_delayed_work(&__get_cpu_var(reap_work), REAPTIMEOUT_CPUC);
@@ -3365,32 +3413,37 @@ next:
#ifdef CONFIG_PROC_FS
-static void *s_start(struct seq_file *m, loff_t *pos)
+static void print_slabinfo_header(struct seq_file *m)
{
- loff_t n = *pos;
- struct list_head *p;
-
- down(&cache_chain_sem);
- if (!n) {
- /*
- * Output format version, so at least we can change it
- * without _too_ many complaints.
- */
+ /*
+ * Output format version, so at least we can change it
+ * without _too_ many complaints.
+ */
#if STATS
- seq_puts(m, "slabinfo - version: 2.1 (statistics)\n");
+ seq_puts(m, "slabinfo - version: 2.1 (statistics)\n");
#else
- seq_puts(m, "slabinfo - version: 2.1\n");
+ seq_puts(m, "slabinfo - version: 2.1\n");
#endif
- seq_puts(m, "# name <active_objs> <num_objs> <objsize> <objperslab> <pagesperslab>");
- seq_puts(m, " : tunables <limit> <batchcount> <sharedfactor>");
- seq_puts(m, " : slabdata <active_slabs> <num_slabs> <sharedavail>");
+ seq_puts(m, "# name <active_objs> <num_objs> <objsize> "
+ "<objperslab> <pagesperslab>");
+ seq_puts(m, " : tunables <limit> <batchcount> <sharedfactor>");
+ seq_puts(m, " : slabdata <active_slabs> <num_slabs> <sharedavail>");
#if STATS
- seq_puts(m, " : globalstat <listallocs> <maxobjs> <grown> <reaped>"
- " <error> <maxfreeable> <nodeallocs> <remotefrees>");
- seq_puts(m, " : cpustat <allochit> <allocmiss> <freehit> <freemiss>");
+ seq_puts(m, " : globalstat <listallocs> <maxobjs> <grown> <reaped> "
+ "<error> <maxfreeable> <nodeallocs> <remotefrees>");
+ seq_puts(m, " : cpustat <allochit> <allocmiss> <freehit> <freemiss>");
#endif
- seq_putc(m, '\n');
- }
+ seq_putc(m, '\n');
+}
+
+static void *s_start(struct seq_file *m, loff_t *pos)
+{
+ loff_t n = *pos;
+ struct list_head *p;
+
+ mutex_lock(&cache_chain_mutex);
+ if (!n)
+ print_slabinfo_header(m);
p = cache_chain.next;
while (n--) {
p = p->next;
@@ -3405,23 +3458,23 @@ static void *s_next(struct seq_file *m, void *p, loff_t *pos)
kmem_cache_t *cachep = p;
++*pos;
return cachep->next.next == &cache_chain ? NULL
- : list_entry(cachep->next.next, kmem_cache_t, next);
+ : list_entry(cachep->next.next, kmem_cache_t, next);
}
static void s_stop(struct seq_file *m, void *p)
{
- up(&cache_chain_sem);
+ mutex_unlock(&cache_chain_mutex);
}
static int s_show(struct seq_file *m, void *p)
{
kmem_cache_t *cachep = p;
struct list_head *q;
- struct slab *slabp;
- unsigned long active_objs;
- unsigned long num_objs;
- unsigned long active_slabs = 0;
- unsigned long num_slabs, free_objects = 0, shared_avail = 0;
+ struct slab *slabp;
+ unsigned long active_objs;
+ unsigned long num_objs;
+ unsigned long active_slabs = 0;
+ unsigned long num_slabs, free_objects = 0, shared_avail = 0;
const char *name;
char *error = NULL;
int node;
@@ -3438,14 +3491,14 @@ static int s_show(struct seq_file *m, void *p)
spin_lock(&l3->list_lock);
- list_for_each(q,&l3->slabs_full) {
+ list_for_each(q, &l3->slabs_full) {
slabp = list_entry(q, struct slab, list);
if (slabp->inuse != cachep->num && !error)
error = "slabs_full accounting error";
active_objs += cachep->num;
active_slabs++;
}
- list_for_each(q,&l3->slabs_partial) {
+ list_for_each(q, &l3->slabs_partial) {
slabp = list_entry(q, struct slab, list);
if (slabp->inuse == cachep->num && !error)
error = "slabs_partial inuse accounting error";
@@ -3454,7 +3507,7 @@ static int s_show(struct seq_file *m, void *p)
active_objs += slabp->inuse;
active_slabs++;
}
- list_for_each(q,&l3->slabs_free) {
+ list_for_each(q, &l3->slabs_free) {
slabp = list_entry(q, struct slab, list);
if (slabp->inuse && !error)
error = "slabs_free/inuse accounting error";
@@ -3465,25 +3518,24 @@ static int s_show(struct seq_file *m, void *p)
spin_unlock(&l3->list_lock);
}
- num_slabs+=active_slabs;
- num_objs = num_slabs*cachep->num;
+ num_slabs += active_slabs;
+ num_objs = num_slabs * cachep->num;
if (num_objs - active_objs != free_objects && !error)
error = "free_objects accounting error";
- name = cachep->name;
+ name = cachep->name;
if (error)
printk(KERN_ERR "slab: cache %s error: %s\n", name, error);
seq_printf(m, "%-17s %6lu %6lu %6u %4u %4d",
- name, active_objs, num_objs, cachep->objsize,
- cachep->num, (1<<cachep->gfporder));
+ name, active_objs, num_objs, cachep->objsize,
+ cachep->num, (1 << cachep->gfporder));
seq_printf(m, " : tunables %4u %4u %4u",
- cachep->limit, cachep->batchcount,
- cachep->shared);
+ cachep->limit, cachep->batchcount, cachep->shared);
seq_printf(m, " : slabdata %6lu %6lu %6lu",
- active_slabs, num_slabs, shared_avail);
+ active_slabs, num_slabs, shared_avail);
#if STATS
- { /* list3 stats */
+ { /* list3 stats */
unsigned long high = cachep->high_mark;
unsigned long allocs = cachep->num_allocations;
unsigned long grown = cachep->grown;
@@ -3494,9 +3546,7 @@ static int s_show(struct seq_file *m, void *p)
unsigned long node_frees = cachep->node_frees;
seq_printf(m, " : globalstat %7lu %6lu %5lu %4lu \
- %4lu %4lu %4lu %4lu",
- allocs, high, grown, reaped, errors,
- max_freeable, node_allocs, node_frees);
+ %4lu %4lu %4lu %4lu", allocs, high, grown, reaped, errors, max_freeable, node_allocs, node_frees);
}
/* cpu stats */
{
@@ -3506,7 +3556,7 @@ static int s_show(struct seq_file *m, void *p)
unsigned long freemiss = atomic_read(&cachep->freemiss);
seq_printf(m, " : cpustat %6lu %6lu %6lu %6lu",
- allochit, allocmiss, freehit, freemiss);
+ allochit, allocmiss, freehit, freemiss);
}
#endif
seq_putc(m, '\n');
@@ -3529,10 +3579,10 @@ static int s_show(struct seq_file *m, void *p)
*/
struct seq_operations slabinfo_op = {
- .start = s_start,
- .next = s_next,
- .stop = s_stop,
- .show = s_show,
+ .start = s_start,
+ .next = s_next,
+ .stop = s_stop,
+ .show = s_show,
};
#define MAX_SLABINFO_WRITE 128
@@ -3543,18 +3593,18 @@ struct seq_operations slabinfo_op = {
* @count: data length
* @ppos: unused
*/
-ssize_t slabinfo_write(struct file *file, const char __user *buffer,
- size_t count, loff_t *ppos)
+ssize_t slabinfo_write(struct file *file, const char __user * buffer,
+ size_t count, loff_t *ppos)
{
- char kbuf[MAX_SLABINFO_WRITE+1], *tmp;
+ char kbuf[MAX_SLABINFO_WRITE + 1], *tmp;
int limit, batchcount, shared, res;
struct list_head *p;
-
+
if (count > MAX_SLABINFO_WRITE)
return -EINVAL;
if (copy_from_user(&kbuf, buffer, count))
return -EFAULT;
- kbuf[MAX_SLABINFO_WRITE] = '\0';
+ kbuf[MAX_SLABINFO_WRITE] = '\0';
tmp = strchr(kbuf, ' ');
if (!tmp)
@@ -3565,25 +3615,24 @@ ssize_t slabinfo_write(struct file *file, const char __user *buffer,
return -EINVAL;
/* Find the cache in the chain of caches. */
- down(&cache_chain_sem);
+ mutex_lock(&cache_chain_mutex);
res = -EINVAL;
- list_for_each(p,&cache_chain) {
+ list_for_each(p, &cache_chain) {
kmem_cache_t *cachep = list_entry(p, kmem_cache_t, next);
if (!strcmp(cachep->name, kbuf)) {
if (limit < 1 ||
batchcount < 1 ||
- batchcount > limit ||
- shared < 0) {
+ batchcount > limit || shared < 0) {
res = 0;
} else {
res = do_tune_cpucache(cachep, limit,
- batchcount, shared);
+ batchcount, shared);
}
break;
}
}
- up(&cache_chain_sem);
+ mutex_unlock(&cache_chain_mutex);
if (res >= 0)
res = count;
return res;
@@ -3609,26 +3658,3 @@ unsigned int ksize(const void *objp)
return obj_reallen(page_get_cache(virt_to_page(objp)));
}
-
-
-/*
- * kstrdup - allocate space for and copy an existing string
- *
- * @s: the string to duplicate
- * @gfp: the GFP mask used in the kmalloc() call when allocating memory
- */
-char *kstrdup(const char *s, gfp_t gfp)
-{
- size_t len;
- char *buf;
-
- if (!s)
- return NULL;
-
- len = strlen(s) + 1;
- buf = kmalloc(len, gfp);
- if (buf)
- memcpy(buf, s, len);
- return buf;
-}
-EXPORT_SYMBOL(kstrdup);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-25 04:32:20 +0000