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authorVladimir Davydov <vdavydov@parallels.com>2014-06-04 16:07:20 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-06-04 16:53:59 -0700
commit03afc0e25f7fc03537014a770f4c54ebbe63a24c (patch)
tree520cdb32e6d35cd5b4e61fc5254a151fb03fc24a
parentbfc8c90139ebd049b9801a951db3b9a4a00bed9c (diff)
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slab: get_online_mems for kmem_cache_{create,destroy,shrink}
When we create a sl[au]b cache, we allocate kmem_cache_node structures for each online NUMA node. To handle nodes taken online/offline, we register memory hotplug notifier and allocate/free kmem_cache_node corresponding to the node that changes its state for each kmem cache. To synchronize between the two paths we hold the slab_mutex during both the cache creationg/destruction path and while tuning per-node parts of kmem caches in memory hotplug handler, but that's not quite right, because it does not guarantee that a newly created cache will have all kmem_cache_nodes initialized in case it races with memory hotplug. For instance, in case of slub: CPU0 CPU1 ---- ---- kmem_cache_create: online_pages: __kmem_cache_create: slab_memory_callback: slab_mem_going_online_callback: lock slab_mutex for each slab_caches list entry allocate kmem_cache node unlock slab_mutex lock slab_mutex init_kmem_cache_nodes: for_each_node_state(node, N_NORMAL_MEMORY) allocate kmem_cache node add kmem_cache to slab_caches list unlock slab_mutex online_pages (continued): node_states_set_node As a result we'll get a kmem cache with not all kmem_cache_nodes allocated. To avoid issues like that we should hold get/put_online_mems() during the whole kmem cache creation/destruction/shrink paths, just like we deal with cpu hotplug. This patch does the trick. Note, that after it's applied, there is no need in taking the slab_mutex for kmem_cache_shrink any more, so it is removed from there. Signed-off-by: Vladimir Davydov <vdavydov@parallels.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: Tang Chen <tangchen@cn.fujitsu.com> Cc: Zhang Yanfei <zhangyanfei@cn.fujitsu.com> Cc: Toshi Kani <toshi.kani@hp.com> Cc: Xishi Qiu <qiuxishi@huawei.com> Cc: Jiang Liu <liuj97@gmail.com> Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Cc: David Rientjes <rientjes@google.com> Cc: Wen Congyang <wency@cn.fujitsu.com> Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/slab.c26
-rw-r--r--mm/slab.h1
-rw-r--r--mm/slab_common.c35
-rw-r--r--mm/slob.c3
-rw-r--r--mm/slub.c5
5 files changed, 39 insertions, 31 deletions
diff --git a/mm/slab.c b/mm/slab.c
index 944ac58cfcf8..7067ea7f3927 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2480,8 +2480,7 @@ out:
return nr_freed;
}
-/* Called with slab_mutex held to protect against cpu hotplug */
-static int __cache_shrink(struct kmem_cache *cachep)
+int __kmem_cache_shrink(struct kmem_cache *cachep)
{
int ret = 0, i = 0;
struct kmem_cache_node *n;
@@ -2502,32 +2501,11 @@ static int __cache_shrink(struct kmem_cache *cachep)
return (ret ? 1 : 0);
}
-/**
- * kmem_cache_shrink - Shrink a cache.
- * @cachep: The cache to shrink.
- *
- * Releases as many slabs as possible for a cache.
- * To help debugging, a zero exit status indicates all slabs were released.
- */
-int kmem_cache_shrink(struct kmem_cache *cachep)
-{
- int ret;
- BUG_ON(!cachep || in_interrupt());
-
- get_online_cpus();
- mutex_lock(&slab_mutex);
- ret = __cache_shrink(cachep);
- mutex_unlock(&slab_mutex);
- put_online_cpus();
- return ret;
-}
-EXPORT_SYMBOL(kmem_cache_shrink);
-
int __kmem_cache_shutdown(struct kmem_cache *cachep)
{
int i;
struct kmem_cache_node *n;
- int rc = __cache_shrink(cachep);
+ int rc = __kmem_cache_shrink(cachep);
if (rc)
return rc;
diff --git a/mm/slab.h b/mm/slab.h
index 863e67b8c8c9..d85d59803d5f 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -91,6 +91,7 @@ __kmem_cache_alias(const char *name, size_t size, size_t align,
#define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS)
int __kmem_cache_shutdown(struct kmem_cache *);
+int __kmem_cache_shrink(struct kmem_cache *);
void slab_kmem_cache_release(struct kmem_cache *);
struct seq_file;
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 2834bc2886fd..2dd920dc3776 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -205,6 +205,8 @@ kmem_cache_create(const char *name, size_t size, size_t align,
int err;
get_online_cpus();
+ get_online_mems();
+
mutex_lock(&slab_mutex);
err = kmem_cache_sanity_check(name, size);
@@ -239,6 +241,8 @@ kmem_cache_create(const char *name, size_t size, size_t align,
out_unlock:
mutex_unlock(&slab_mutex);
+
+ put_online_mems();
put_online_cpus();
if (err) {
@@ -272,6 +276,8 @@ void kmem_cache_create_memcg(struct mem_cgroup *memcg, struct kmem_cache *root_c
char *cache_name;
get_online_cpus();
+ get_online_mems();
+
mutex_lock(&slab_mutex);
/*
@@ -295,6 +301,8 @@ void kmem_cache_create_memcg(struct mem_cgroup *memcg, struct kmem_cache *root_c
out_unlock:
mutex_unlock(&slab_mutex);
+
+ put_online_mems();
put_online_cpus();
}
@@ -328,6 +336,8 @@ void slab_kmem_cache_release(struct kmem_cache *s)
void kmem_cache_destroy(struct kmem_cache *s)
{
get_online_cpus();
+ get_online_mems();
+
mutex_lock(&slab_mutex);
s->refcount--;
@@ -359,15 +369,36 @@ void kmem_cache_destroy(struct kmem_cache *s)
#else
slab_kmem_cache_release(s);
#endif
- goto out_put_cpus;
+ goto out;
out_unlock:
mutex_unlock(&slab_mutex);
-out_put_cpus:
+out:
+ put_online_mems();
put_online_cpus();
}
EXPORT_SYMBOL(kmem_cache_destroy);
+/**
+ * kmem_cache_shrink - Shrink a cache.
+ * @cachep: The cache to shrink.
+ *
+ * Releases as many slabs as possible for a cache.
+ * To help debugging, a zero exit status indicates all slabs were released.
+ */
+int kmem_cache_shrink(struct kmem_cache *cachep)
+{
+ int ret;
+
+ get_online_cpus();
+ get_online_mems();
+ ret = __kmem_cache_shrink(cachep);
+ put_online_mems();
+ put_online_cpus();
+ return ret;
+}
+EXPORT_SYMBOL(kmem_cache_shrink);
+
int slab_is_available(void)
{
return slab_state >= UP;
diff --git a/mm/slob.c b/mm/slob.c
index 730cad45d4be..21980e0f39a8 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -620,11 +620,10 @@ int __kmem_cache_shutdown(struct kmem_cache *c)
return 0;
}
-int kmem_cache_shrink(struct kmem_cache *d)
+int __kmem_cache_shrink(struct kmem_cache *d)
{
return 0;
}
-EXPORT_SYMBOL(kmem_cache_shrink);
struct kmem_cache kmem_cache_boot = {
.name = "kmem_cache",
diff --git a/mm/slub.c b/mm/slub.c
index 9cb2501a2960..5d1b653183ab 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3398,7 +3398,7 @@ EXPORT_SYMBOL(kfree);
* being allocated from last increasing the chance that the last objects
* are freed in them.
*/
-int kmem_cache_shrink(struct kmem_cache *s)
+int __kmem_cache_shrink(struct kmem_cache *s)
{
int node;
int i;
@@ -3454,7 +3454,6 @@ int kmem_cache_shrink(struct kmem_cache *s)
kfree(slabs_by_inuse);
return 0;
}
-EXPORT_SYMBOL(kmem_cache_shrink);
static int slab_mem_going_offline_callback(void *arg)
{
@@ -3462,7 +3461,7 @@ static int slab_mem_going_offline_callback(void *arg)
mutex_lock(&slab_mutex);
list_for_each_entry(s, &slab_caches, list)
- kmem_cache_shrink(s);
+ __kmem_cache_shrink(s);
mutex_unlock(&slab_mutex);
return 0;