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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>
This commit is contained in:
Vladimir Davydov 2014-04-07 15:39:31 -07:00 committed by Linus Torvalds
parent 84d0ddd6b0
commit 9a41707bd3
2 changed files with 28 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/linux/slub_def.h
View File

@ -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

26
mm/slub.c
View File

@ -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);