cgroup: list groupoom in cgroup features
List groupoom in cgroup features list (exported via
/sys/kernel/cgroup/features), which can be used by a userspace apps (most
likely, systemd) to get an idea which cgroup features are supported by
kernel.
Link: http://lkml.kernel.org/r/20171130152824.1591-8-guro@fb.com
Signed-off-by: Roman Gushchin <guro@fb.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: David Rientjes <rientjes@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index 4b64e63..de25822 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -5967,7 +5967,8 @@ static struct kobj_attribute cgroup_delegate_attr = __ATTR_RO(delegate);
static ssize_t features_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
- return snprintf(buf, PAGE_SIZE, "nsdelegate\n");
+ return snprintf(buf, PAGE_SIZE, "nsdelegate\n"
+ "groupoom\n");
}
static struct kobj_attribute cgroup_features_attr = __ATTR_RO(features);
