memcg: replace ss->id_lock with a rwlock

While back-porting Johannes Weiner's patch "mm: memcg-aware global
reclaim" for an internal effort, we noticed a significant performance
regression during page-reclaim heavy workloads due to high contention of
the ss->id_lock.  This lock protects idr map, and serializes calls to
idr_get_next() in css_get_next() (which is used during the memcg hierarchy
walk).

Since idr_get_next() is just doing a look up, we need only serialize it
with respect to idr_remove()/idr_get_new().  By making the ss->id_lock a
rwlock, contention is greatly reduced and performance improves.

Tested: cat a 256m file from a ramdisk in a 128m container 50 times on
each core (one file + container per core) in parallel on a NUMA machine.
Result is the time for the test to complete in 1 of the containers.
Both kernels included Johannes' memcg-aware global reclaim patches.

Before rwlock patch: 1710.778s
After rwlock patch: 152.227s

Signed-off-by: Andrew Bresticker <abrestic@google.com>
Cc: Paul Menage <menage@gmail.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Ying Han <yinghan@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 9 insertions, 9 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 8386b21224ef..d9d5648f3cdc 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -4883,9 +4883,9 @@ void free_css_id(struct cgroup_subsys *ss, struct cgroup_subsys_state *css)
 
         rcu_assign_pointer(id->css, NULL);
         rcu_assign_pointer(css->id, NULL);
-        spin_lock(&ss->id_lock);
+        write_lock(&ss->id_lock);
         idr_remove(&ss->idr, id->id);
-        spin_unlock(&ss->id_lock);
+        write_unlock(&ss->id_lock);
         kfree_rcu(id, rcu_head);
 }
 EXPORT_SYMBOL_GPL(free_css_id);
@@ -4911,10 +4911,10 @@ static struct css_id *get_new_cssid(struct cgroup_subsys *ss, int depth)
                 error = -ENOMEM;
                 goto err_out;
         }
-        spin_lock(&ss->id_lock);
+        write_lock(&ss->id_lock);
         /* Don't use 0. allocates an ID of 1-65535 */
         error = idr_get_new_above(&ss->idr, newid, 1, &myid);
-        spin_unlock(&ss->id_lock);
+        write_unlock(&ss->id_lock);
 
         /* Returns error when there are no free spaces for new ID.*/
         if (error) {
@@ -4929,9 +4929,9 @@ static struct css_id *get_new_cssid(struct cgroup_subsys *ss, int depth)
         return newid;
 remove_idr:
         error = -ENOSPC;
-        spin_lock(&ss->id_lock);
+        write_lock(&ss->id_lock);
         idr_remove(&ss->idr, myid);
-        spin_unlock(&ss->id_lock);
+        write_unlock(&ss->id_lock);
 err_out:
         kfree(newid);
         return ERR_PTR(error);
@@ -4943,7 +4943,7 @@ static int __init_or_module cgroup_init_idr(struct cgroup_subsys *ss,
 {
         struct css_id *newid;
 
-        spin_lock_init(&ss->id_lock);
+        rwlock_init(&ss->id_lock);
         idr_init(&ss->idr);
 
         newid = get_new_cssid(ss, 0);
@@ -5038,9 +5038,9 @@ css_get_next(struct cgroup_subsys *ss, int id,
                  * scan next entry from bitmap(tree), tmpid is updated after
                  * idr_get_next().
                  */
-                spin_lock(&ss->id_lock);
+                read_lock(&ss->id_lock);
                 tmp = idr_get_next(&ss->idr, &tmpid);
-                spin_unlock(&ss->id_lock);
+                read_unlock(&ss->id_lock);
 
                 if (!tmp)
                         break;