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authorGlauber Costa <glommer@parallels.com>2012-12-18 14:23:01 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-18 15:02:14 -0800
commit749c54151a6e5b229e4ae067dbc651e54b161fbc (patch)
tree8d2d858e76e44d1bbf64439c189a57c18c8e60ae /mm/memcontrol.c
parent22933152934f30de6f05b600c03f8a08f853a8d2 (diff)
downloadlinux-749c54151a6e5b229e4ae067dbc651e54b161fbc.tar.bz2
memcg: aggregate memcg cache values in slabinfo
When we create caches in memcgs, we need to display their usage information somewhere. We'll adopt a scheme similar to /proc/meminfo, with aggregate totals shown in the global file, and per-group information stored in the group itself. For the time being, only reads are allowed in the per-group cache. Signed-off-by: Glauber Costa <glommer@parallels.com> Cc: Christoph Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Cc: Frederic Weisbecker <fweisbec@redhat.com> Cc: Greg Thelen <gthelen@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: JoonSoo Kim <js1304@gmail.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Michal Hocko <mhocko@suse.cz> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Cc: Rik van Riel <riel@redhat.com> Cc: Suleiman Souhlal <suleiman@google.com> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol.c')
-rw-r--r--mm/memcontrol.c30
1 files changed, 29 insertions, 1 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 7633e0d429e0..a32d83c2e353 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -572,7 +572,8 @@ static void disarm_sock_keys(struct mem_cgroup *memcg)
* increase it.
*/
static DEFINE_IDA(kmem_limited_groups);
-static int memcg_limited_groups_array_size;
+int memcg_limited_groups_array_size;
+
/*
* MIN_SIZE is different than 1, because we would like to avoid going through
* the alloc/free process all the time. In a small machine, 4 kmem-limited
@@ -2794,6 +2795,27 @@ static struct kmem_cache *memcg_params_to_cache(struct memcg_cache_params *p)
return cachep->memcg_params->memcg_caches[memcg_cache_id(p->memcg)];
}
+#ifdef CONFIG_SLABINFO
+static int mem_cgroup_slabinfo_read(struct cgroup *cont, struct cftype *cft,
+ struct seq_file *m)
+{
+ struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
+ struct memcg_cache_params *params;
+
+ if (!memcg_can_account_kmem(memcg))
+ return -EIO;
+
+ print_slabinfo_header(m);
+
+ mutex_lock(&memcg->slab_caches_mutex);
+ list_for_each_entry(params, &memcg->memcg_slab_caches, list)
+ cache_show(memcg_params_to_cache(params), m);
+ mutex_unlock(&memcg->slab_caches_mutex);
+
+ return 0;
+}
+#endif
+
static int memcg_charge_kmem(struct mem_cgroup *memcg, gfp_t gfp, u64 size)
{
struct res_counter *fail_res;
@@ -5822,6 +5844,12 @@ static struct cftype mem_cgroup_files[] = {
.trigger = mem_cgroup_reset,
.read = mem_cgroup_read,
},
+#ifdef CONFIG_SLABINFO
+ {
+ .name = "kmem.slabinfo",
+ .read_seq_string = mem_cgroup_slabinfo_read,
+ },
+#endif
#endif
{ }, /* terminate */
};