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authorJens Axboe <jaxboe@fusionio.com>2010-06-01 12:42:12 +0200
committerJens Axboe <jaxboe@fusionio.com>2010-06-01 12:42:12 +0200
commitb4ca761577535b2b4d153689ee97342797dfff05 (patch)
tree29054d55508f1faa22ec32acf7c245751af03348 /mm/slab.c
parent28f4197e5d4707311febeec8a0eb97cb5fd93c97 (diff)
parent67a3e12b05e055c0415c556a315a3d3eb637e29e (diff)
downloadlinux-2.6.34-ux500-b4ca761577535b2b4d153689ee97342797dfff05.tar.gz
Merge branch 'master' into for-linus
Conflicts: fs/pipe.c Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'mm/slab.c')
-rw-r--r--mm/slab.c249
1 files changed, 162 insertions, 87 deletions
diff --git a/mm/slab.c b/mm/slab.c
index bac0f4fcc21..e49f8f46f46 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -115,6 +115,7 @@
#include <linux/reciprocal_div.h>
#include <linux/debugobjects.h>
#include <linux/kmemcheck.h>
+#include <linux/memory.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
@@ -144,30 +145,6 @@
#define BYTES_PER_WORD sizeof(void *)
#define REDZONE_ALIGN max(BYTES_PER_WORD, __alignof__(unsigned long long))
-#ifndef ARCH_KMALLOC_MINALIGN
-/*
- * Enforce a minimum alignment for the kmalloc caches.
- * Usually, the kmalloc caches are cache_line_size() aligned, except when
- * DEBUG and FORCED_DEBUG are enabled, then they are BYTES_PER_WORD aligned.
- * Some archs want to perform DMA into kmalloc caches and need a guaranteed
- * alignment larger than the alignment of a 64-bit integer.
- * ARCH_KMALLOC_MINALIGN allows that.
- * Note that increasing this value may disable some debug features.
- */
-#define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long)
-#endif
-
-#ifndef ARCH_SLAB_MINALIGN
-/*
- * Enforce a minimum alignment for all caches.
- * Intended for archs that get misalignment faults even for BYTES_PER_WORD
- * aligned buffers. Includes ARCH_KMALLOC_MINALIGN.
- * If possible: Do not enable this flag for CONFIG_DEBUG_SLAB, it disables
- * some debug features.
- */
-#define ARCH_SLAB_MINALIGN 0
-#endif
-
#ifndef ARCH_KMALLOC_FLAGS
#define ARCH_KMALLOC_FLAGS SLAB_HWCACHE_ALIGN
#endif
@@ -844,7 +821,7 @@ static void init_reap_node(int cpu)
{
int node;
- node = next_node(cpu_to_node(cpu), node_online_map);
+ node = next_node(cpu_to_mem(cpu), node_online_map);
if (node == MAX_NUMNODES)
node = first_node(node_online_map);
@@ -1073,7 +1050,7 @@ static inline int cache_free_alien(struct kmem_cache *cachep, void *objp)
struct array_cache *alien = NULL;
int node;
- node = numa_node_id();
+ node = numa_mem_id();
/*
* Make sure we are not freeing a object from another node to the array
@@ -1102,11 +1079,57 @@ static inline int cache_free_alien(struct kmem_cache *cachep, void *objp)
}
#endif
+/*
+ * Allocates and initializes nodelists for a node on each slab cache, used for
+ * either memory or cpu hotplug. If memory is being hot-added, the kmem_list3
+ * will be allocated off-node since memory is not yet online for the new node.
+ * When hotplugging memory or a cpu, existing nodelists are not replaced if
+ * already in use.
+ *
+ * Must hold cache_chain_mutex.
+ */
+static int init_cache_nodelists_node(int node)
+{
+ struct kmem_cache *cachep;
+ struct kmem_list3 *l3;
+ const int memsize = sizeof(struct kmem_list3);
+
+ list_for_each_entry(cachep, &cache_chain, next) {
+ /*
+ * Set up the size64 kmemlist for cpu before we can
+ * begin anything. Make sure some other cpu on this
+ * node has not already allocated this
+ */
+ if (!cachep->nodelists[node]) {
+ l3 = kmalloc_node(memsize, GFP_KERNEL, node);
+ if (!l3)
+ return -ENOMEM;
+ kmem_list3_init(l3);
+ l3->next_reap = jiffies + REAPTIMEOUT_LIST3 +
+ ((unsigned long)cachep) % REAPTIMEOUT_LIST3;
+
+ /*
+ * The l3s don't come and go as CPUs come and
+ * go. cache_chain_mutex is sufficient
+ * protection here.
+ */
+ 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;
+ spin_unlock_irq(&cachep->nodelists[node]->list_lock);
+ }
+ return 0;
+}
+
static void __cpuinit cpuup_canceled(long cpu)
{
struct kmem_cache *cachep;
struct kmem_list3 *l3 = NULL;
- int node = cpu_to_node(cpu);
+ int node = cpu_to_mem(cpu);
const struct cpumask *mask = cpumask_of_node(node);
list_for_each_entry(cachep, &cache_chain, next) {
@@ -1171,8 +1194,8 @@ static int __cpuinit cpuup_prepare(long cpu)
{
struct kmem_cache *cachep;
struct kmem_list3 *l3 = NULL;
- int node = cpu_to_node(cpu);
- const int memsize = sizeof(struct kmem_list3);
+ int node = cpu_to_mem(cpu);
+ int err;
/*
* We need to do this right in the beginning since
@@ -1180,35 +1203,9 @@ static int __cpuinit cpuup_prepare(long cpu)
* kmalloc_node allows us to add the slab to the right
* kmem_list3 and not this cpu's kmem_list3
*/
-
- list_for_each_entry(cachep, &cache_chain, next) {
- /*
- * Set up the size64 kmemlist for cpu before we can
- * begin anything. Make sure some other cpu on this
- * node has not already allocated this
- */
- if (!cachep->nodelists[node]) {
- l3 = kmalloc_node(memsize, GFP_KERNEL, node);
- if (!l3)
- goto bad;
- kmem_list3_init(l3);
- l3->next_reap = jiffies + REAPTIMEOUT_LIST3 +
- ((unsigned long)cachep) % REAPTIMEOUT_LIST3;
-
- /*
- * The l3s don't come and go as CPUs come and
- * go. cache_chain_mutex is sufficient
- * protection here.
- */
- 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;
- spin_unlock_irq(&cachep->nodelists[node]->list_lock);
- }
+ err = init_cache_nodelists_node(node);
+ if (err < 0)
+ goto bad;
/*
* Now we can go ahead with allocating the shared arrays and
@@ -1324,18 +1321,82 @@ static int __cpuinit cpuup_callback(struct notifier_block *nfb,
mutex_unlock(&cache_chain_mutex);
break;
}
- return err ? NOTIFY_BAD : NOTIFY_OK;
+ return notifier_from_errno(err);
}
static struct notifier_block __cpuinitdata cpucache_notifier = {
&cpuup_callback, NULL, 0
};
+#if defined(CONFIG_NUMA) && defined(CONFIG_MEMORY_HOTPLUG)
+/*
+ * Drains freelist for a node on each slab cache, used for memory hot-remove.
+ * Returns -EBUSY if all objects cannot be drained so that the node is not
+ * removed.
+ *
+ * Must hold cache_chain_mutex.
+ */
+static int __meminit drain_cache_nodelists_node(int node)
+{
+ struct kmem_cache *cachep;
+ int ret = 0;
+
+ list_for_each_entry(cachep, &cache_chain, next) {
+ struct kmem_list3 *l3;
+
+ l3 = cachep->nodelists[node];
+ if (!l3)
+ continue;
+
+ drain_freelist(cachep, l3, l3->free_objects);
+
+ if (!list_empty(&l3->slabs_full) ||
+ !list_empty(&l3->slabs_partial)) {
+ ret = -EBUSY;
+ break;
+ }
+ }
+ return ret;
+}
+
+static int __meminit slab_memory_callback(struct notifier_block *self,
+ unsigned long action, void *arg)
+{
+ struct memory_notify *mnb = arg;
+ int ret = 0;
+ int nid;
+
+ nid = mnb->status_change_nid;
+ if (nid < 0)
+ goto out;
+
+ switch (action) {
+ case MEM_GOING_ONLINE:
+ mutex_lock(&cache_chain_mutex);
+ ret = init_cache_nodelists_node(nid);
+ mutex_unlock(&cache_chain_mutex);
+ break;
+ case MEM_GOING_OFFLINE:
+ mutex_lock(&cache_chain_mutex);
+ ret = drain_cache_nodelists_node(nid);
+ mutex_unlock(&cache_chain_mutex);
+ break;
+ case MEM_ONLINE:
+ case MEM_OFFLINE:
+ case MEM_CANCEL_ONLINE:
+ case MEM_CANCEL_OFFLINE:
+ break;
+ }
+out:
+ return ret ? notifier_from_errno(ret) : NOTIFY_OK;
+}
+#endif /* CONFIG_NUMA && CONFIG_MEMORY_HOTPLUG */
+
/*
* swap the static kmem_list3 with kmalloced memory
*/
-static void init_list(struct kmem_cache *cachep, struct kmem_list3 *list,
- int nodeid)
+static void __init init_list(struct kmem_cache *cachep, struct kmem_list3 *list,
+ int nodeid)
{
struct kmem_list3 *ptr;
@@ -1418,7 +1479,7 @@ void __init kmem_cache_init(void)
* 6) Resize the head arrays of the kmalloc caches to their final sizes.
*/
- node = numa_node_id();
+ node = numa_mem_id();
/* 1) create the cache_cache */
INIT_LIST_HEAD(&cache_chain);
@@ -1580,6 +1641,14 @@ void __init kmem_cache_init_late(void)
*/
register_cpu_notifier(&cpucache_notifier);
+#ifdef CONFIG_NUMA
+ /*
+ * Register a memory hotplug callback that initializes and frees
+ * nodelists.
+ */
+ hotplug_memory_notifier(slab_memory_callback, SLAB_CALLBACK_PRI);
+#endif
+
/*
* The reap timers are started later, with a module init call: That part
* of the kernel is not yet operational.
@@ -2052,7 +2121,7 @@ static int __init_refok setup_cpu_cache(struct kmem_cache *cachep, gfp_t gfp)
}
}
}
- cachep->nodelists[numa_node_id()]->next_reap =
+ cachep->nodelists[numa_mem_id()]->next_reap =
jiffies + REAPTIMEOUT_LIST3 +
((unsigned long)cachep) % REAPTIMEOUT_LIST3;
@@ -2220,8 +2289,8 @@ kmem_cache_create (const char *name, size_t size, size_t align,
if (ralign < align) {
ralign = align;
}
- /* disable debug if necessary */
- if (ralign > __alignof__(unsigned long long))
+ /* disable debug if not aligning with REDZONE_ALIGN */
+ if (ralign & (__alignof__(unsigned long long) - 1))
flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER);
/*
* 4) Store it.
@@ -2247,8 +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 += sizeof(unsigned long long);
- size += 2 * sizeof(unsigned long long);
+ cachep->obj_offset += align;
+ size += align + sizeof(unsigned long long);
}
if (flags & SLAB_STORE_USER) {
/* user store requires one word storage behind the end of
@@ -2383,7 +2452,7 @@ static void check_spinlock_acquired(struct kmem_cache *cachep)
{
#ifdef CONFIG_SMP
check_irq_off();
- assert_spin_locked(&cachep->nodelists[numa_node_id()]->list_lock);
+ assert_spin_locked(&cachep->nodelists[numa_mem_id()]->list_lock);
#endif
}
@@ -2410,7 +2479,7 @@ static void do_drain(void *arg)
{
struct kmem_cache *cachep = arg;
struct array_cache *ac;
- int node = numa_node_id();
+ int node = numa_mem_id();
check_irq_off();
ac = cpu_cache_get(cachep);
@@ -2943,7 +3012,7 @@ static void *cache_alloc_refill(struct kmem_cache *cachep, gfp_t flags)
retry:
check_irq_off();
- node = numa_node_id();
+ node = numa_mem_id();
ac = cpu_cache_get(cachep);
batchcount = ac->batchcount;
if (!ac->touched && batchcount > BATCHREFILL_LIMIT) {
@@ -3147,11 +3216,13 @@ static void *alternate_node_alloc(struct kmem_cache *cachep, gfp_t flags)
if (in_interrupt() || (flags & __GFP_THISNODE))
return NULL;
- nid_alloc = nid_here = numa_node_id();
+ nid_alloc = nid_here = numa_mem_id();
+ get_mems_allowed();
if (cpuset_do_slab_mem_spread() && (cachep->flags & SLAB_MEM_SPREAD))
- nid_alloc = cpuset_mem_spread_node();
+ nid_alloc = cpuset_slab_spread_node();
else if (current->mempolicy)
nid_alloc = slab_node(current->mempolicy);
+ put_mems_allowed();
if (nid_alloc != nid_here)
return ____cache_alloc_node(cachep, flags, nid_alloc);
return NULL;
@@ -3178,6 +3249,7 @@ static void *fallback_alloc(struct kmem_cache *cache, gfp_t flags)
if (flags & __GFP_THISNODE)
return NULL;
+ get_mems_allowed();
zonelist = node_zonelist(slab_node(current->mempolicy), flags);
local_flags = flags & (GFP_CONSTRAINT_MASK|GFP_RECLAIM_MASK);
@@ -3209,7 +3281,7 @@ retry:
if (local_flags & __GFP_WAIT)
local_irq_enable();
kmem_flagcheck(cache, flags);
- obj = kmem_getpages(cache, local_flags, numa_node_id());
+ obj = kmem_getpages(cache, local_flags, numa_mem_id());
if (local_flags & __GFP_WAIT)
local_irq_disable();
if (obj) {
@@ -3233,6 +3305,7 @@ retry:
}
}
}
+ put_mems_allowed();
return obj;
}
@@ -3316,6 +3389,7 @@ __cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid,
{
unsigned long save_flags;
void *ptr;
+ int slab_node = numa_mem_id();
flags &= gfp_allowed_mask;
@@ -3328,7 +3402,7 @@ __cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid,
local_irq_save(save_flags);
if (nodeid == -1)
- nodeid = numa_node_id();
+ nodeid = slab_node;
if (unlikely(!cachep->nodelists[nodeid])) {
/* Node not bootstrapped yet */
@@ -3336,7 +3410,7 @@ __cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid,
goto out;
}
- if (nodeid == numa_node_id()) {
+ if (nodeid == slab_node) {
/*
* Use the locally cached objects if possible.
* However ____cache_alloc does not allow fallback
@@ -3380,8 +3454,8 @@ __do_cache_alloc(struct kmem_cache *cache, gfp_t flags)
* We may just have run out of memory on the local node.
* ____cache_alloc_node() knows how to locate memory on other nodes
*/
- if (!objp)
- objp = ____cache_alloc_node(cache, flags, numa_node_id());
+ if (!objp)
+ objp = ____cache_alloc_node(cache, flags, numa_mem_id());
out:
return objp;
@@ -3478,7 +3552,7 @@ static void cache_flusharray(struct kmem_cache *cachep, struct array_cache *ac)
{
int batchcount;
struct kmem_list3 *l3;
- int node = numa_node_id();
+ int node = numa_mem_id();
batchcount = ac->batchcount;
#if DEBUG
@@ -3912,7 +3986,7 @@ static int do_tune_cpucache(struct kmem_cache *cachep, int limit,
return -ENOMEM;
for_each_online_cpu(i) {
- new->new[i] = alloc_arraycache(cpu_to_node(i), limit,
+ new->new[i] = alloc_arraycache(cpu_to_mem(i), limit,
batchcount, gfp);
if (!new->new[i]) {
for (i--; i >= 0; i--)
@@ -3934,9 +4008,9 @@ static int do_tune_cpucache(struct kmem_cache *cachep, int limit,
struct array_cache *ccold = new->new[i];
if (!ccold)
continue;
- spin_lock_irq(&cachep->nodelists[cpu_to_node(i)]->list_lock);
- free_block(cachep, ccold->entry, ccold->avail, cpu_to_node(i));
- spin_unlock_irq(&cachep->nodelists[cpu_to_node(i)]->list_lock);
+ spin_lock_irq(&cachep->nodelists[cpu_to_mem(i)]->list_lock);
+ free_block(cachep, ccold->entry, ccold->avail, cpu_to_mem(i));
+ spin_unlock_irq(&cachep->nodelists[cpu_to_mem(i)]->list_lock);
kfree(ccold);
}
kfree(new);
@@ -4042,7 +4116,7 @@ static void cache_reap(struct work_struct *w)
{
struct kmem_cache *searchp;
struct kmem_list3 *l3;
- int node = numa_node_id();
+ int node = numa_mem_id();
struct delayed_work *work = to_delayed_work(w);
if (!mutex_trylock(&cache_chain_mutex))
@@ -4216,10 +4290,11 @@ static int s_show(struct seq_file *m, void *p)
unsigned long node_frees = cachep->node_frees;
unsigned long overflows = cachep->node_overflow;
- seq_printf(m, " : globalstat %7lu %6lu %5lu %4lu \
- %4lu %4lu %4lu %4lu %4lu", allocs, high, grown,
- reaped, errors, max_freeable, node_allocs,
- node_frees, overflows);
+ seq_printf(m, " : globalstat %7lu %6lu %5lu %4lu "
+ "%4lu %4lu %4lu %4lu %4lu",
+ allocs, high, grown,
+ reaped, errors, max_freeable, node_allocs,
+ node_frees, overflows);
}
/* cpu stats */
{