From: Lennart Poettering <lennart@poettering.net>
Date: Thu, 3 Nov 2011 18:42:53 +0000 (+0100)
Subject: cgroup: immediately remove all cgroups which run empty
X-Git-Tag: v38~205
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=commitdiff_plain;h=353fa6a21aab96b0b82ab40cc22b08b1fb0bf652

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.
---

diff --git a/src/cgroup.c b/src/cgroup.c
index be837c3d0..4bbb54fd7 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;