From 54a91c5eae72181cc7aadf618c152e18ac336b5e Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Thu, 3 Nov 2011 19:42:53 +0100
Subject: [PATCH] cgroup: immediately remove all cgroups which run empty

Some controllers have scaling problems when many empty cgroups exist.
Hence, as soon as we get a notification that a cgroup is empty, delete
it. This is also nice to keep the systemd-cgls output short.
(cherry picked from commit 353fa6a21aab96b0b82ab40cc22b08b1fb0bf652)
---
 src/cgroup.c |   12 +++++++++---
 1 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/cgroup.c b/src/cgroup.c
index be837c3..4bbb54f 100644
--- a/src/cgroup.c
+++ b/src/cgroup.c
@@ -363,7 +363,8 @@ int cgroup_notify_empty(Manager *m, const char *group) {
         assert(m);
         assert(group);
 
-        if (!(l = hashmap_get(m->cgroup_bondings, group)))
+        l = hashmap_get(m->cgroup_bondings, group);
+        if (!l)
                 return 0;
 
         LIST_FOREACH(by_path, b, l) {
@@ -372,7 +373,8 @@ int cgroup_notify_empty(Manager *m, const char *group) {
                 if (!b->unit)
                         continue;
 
-                if ((t = cgroup_bonding_is_empty_list(b)) < 0) {
+                t = cgroup_bonding_is_empty_list(b);
+                if (t < 0) {
 
                         /* If we don't know, we don't know */
                         if (t != -EAGAIN)
@@ -381,9 +383,13 @@ int cgroup_notify_empty(Manager *m, const char *group) {
                         continue;
                 }
 
-                if (t > 0)
+                if (t > 0) {
+                        /* If it is empty, let's delete it */
+                        cgroup_bonding_trim_list(b->unit->meta.cgroup_bondings, true);
+
                         if (UNIT_VTABLE(b->unit)->cgroup_notify_empty)
                                 UNIT_VTABLE(b->unit)->cgroup_notify_empty(b->unit);
+                }
         }
 
         return 0;
-- 
1.7.7.5