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authorVladimir Davydov <vdavydov@parallels.com>2014-04-07 15:39:31 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-04-07 16:36:13 -0700
commit9a41707bd3a0811919000daf094e9d50ea65f7da (patch)
treeb42ddbd3089e948f5a623132cf8bed7215707327
parent84d0ddd6b0e3187d85e609c2d10c36089cf0be04 (diff)
slub: rework sysfs layout for memcg caches
Currently, we try to arrange sysfs entries for memcg caches in the same manner as for global caches. Apart from turning /sys/kernel/slab into a mess when there are a lot of kmem-active memcgs created, it actually does not work properly - we won't create more than one link to a memcg cache in case its parent is merged with another cache. For instance, if A is a root cache merged with another root cache B, we will have the following sysfs setup: X A -> X B -> X where X is some unique id (see create_unique_id()). Now if memcgs M and N start to allocate from cache A (or B, which is the same), we will get: X X:M X:N A -> X B -> X A:M -> X:M A:N -> X:N Since B is an alias for A, we won't get entries B:M and B:N, which is confusing. It is more logical to have entries for memcg caches under the corresponding root cache's sysfs directory. This would allow us to keep sysfs layout clean, and avoid such inconsistencies like one described above. This patch does the trick. It creates a "cgroup" kset in each root cache kobject to keep its children caches there. Signed-off-by: Vladimir Davydov <vdavydov@parallels.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: David Rientjes <rientjes@google.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: Glauber Costa <glommer@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/slub_def.h3
-rw-r--r--mm/slub.c26
2 files changed, 28 insertions, 1 deletions
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index f56bfa9e4526..f2f7398848cf 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -87,6 +87,9 @@ struct kmem_cache {
#ifdef CONFIG_MEMCG_KMEM
struct memcg_cache_params *memcg_params;
int max_attr_size; /* for propagation, maximum size of a stored attr */
+#ifdef CONFIG_SYSFS
+ struct kset *memcg_kset;
+#endif
#endif
#ifdef CONFIG_NUMA
diff --git a/mm/slub.c b/mm/slub.c
index 33939e72bc37..3508edec19f9 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -5138,6 +5138,15 @@ static const struct kset_uevent_ops slab_uevent_ops = {
static struct kset *slab_kset;
+static inline struct kset *cache_kset(struct kmem_cache *s)
+{
+#ifdef CONFIG_MEMCG_KMEM
+ if (!is_root_cache(s))
+ return s->memcg_params->root_cache->memcg_kset;
+#endif
+ return slab_kset;
+}
+
#define ID_STR_LENGTH 64
/* Create a unique string id for a slab cache:
@@ -5203,7 +5212,7 @@ static int sysfs_slab_add(struct kmem_cache *s)
name = create_unique_id(s);
}
- s->kobj.kset = slab_kset;
+ s->kobj.kset = cache_kset(s);
err = kobject_init_and_add(&s->kobj, &slab_ktype, NULL, "%s", name);
if (err) {
kobject_put(&s->kobj);
@@ -5216,6 +5225,18 @@ static int sysfs_slab_add(struct kmem_cache *s)
kobject_put(&s->kobj);
return err;
}
+
+#ifdef CONFIG_MEMCG_KMEM
+ if (is_root_cache(s)) {
+ s->memcg_kset = kset_create_and_add("cgroup", NULL, &s->kobj);
+ if (!s->memcg_kset) {
+ kobject_del(&s->kobj);
+ kobject_put(&s->kobj);
+ return -ENOMEM;
+ }
+ }
+#endif
+
kobject_uevent(&s->kobj, KOBJ_ADD);
if (!unmergeable) {
/* Setup first alias */
@@ -5234,6 +5255,9 @@ static void sysfs_slab_remove(struct kmem_cache *s)
*/
return;
+#ifdef CONFIG_MEMCG_KMEM
+ kset_unregister(s->memcg_kset);
+#endif
kobject_uevent(&s->kobj, KOBJ_REMOVE);
kobject_del(&s->kobj);
kobject_put(&s->kobj);