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| author | Johannes Weiner <hannes@cmpxchg.org> | 2013-10-31 16:34:14 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-10-31 16:58:13 -0700 |
| commit | 0056f4e66a1b8f00245248877e80386af36af14c (patch) | |
| tree | 1113e39ea47376d1d0071abf75bf336441e5cc26 /mm | |
| parent | 3168ecbe1c04ec3feb7cb42388a17d7f047fe1a2 (diff) | |
| download | linux-stable-0056f4e66a1b8f00245248877e80386af36af14c.tar.gz linux-stable-0056f4e66a1b8f00245248877e80386af36af14c.tar.bz2 linux-stable-0056f4e66a1b8f00245248877e80386af36af14c.zip | |
mm: memcg: lockdep annotation for memcg OOM lock
The memcg OOM lock is a mutex-type lock that is open-coded due to
memcg's special needs. Add annotations for lockdep coverage.
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/memcontrol.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 623d5c8bb1e1..7e11cb7d75b1 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -54,6 +54,7 @@ #include <linux/page_cgroup.h> #include <linux/cpu.h> #include <linux/oom.h> +#include <linux/lockdep.h> #include "internal.h" #include <net/sock.h> #include <net/ip.h> @@ -2046,6 +2047,12 @@ static int mem_cgroup_soft_reclaim(struct mem_cgroup *root_memcg, return total; } +#ifdef CONFIG_LOCKDEP +static struct lockdep_map memcg_oom_lock_dep_map = { + .name = "memcg_oom_lock", +}; +#endif + static DEFINE_SPINLOCK(memcg_oom_lock); /* @@ -2083,7 +2090,8 @@ static bool mem_cgroup_oom_trylock(struct mem_cgroup *memcg) } iter->oom_lock = false; } - } + } else + mutex_acquire(&memcg_oom_lock_dep_map, 0, 1, _RET_IP_); spin_unlock(&memcg_oom_lock); @@ -2095,6 +2103,7 @@ static void mem_cgroup_oom_unlock(struct mem_cgroup *memcg) struct mem_cgroup *iter; spin_lock(&memcg_oom_lock); + mutex_release(&memcg_oom_lock_dep_map, 1, _RET_IP_); for_each_mem_cgroup_tree(iter, memcg) iter->oom_lock = false; spin_unlock(&memcg_oom_lock); |