misc_cgroup: introduce misc.events to count failures

Introduce misc.events to make it easier for us to understand
the pressure of resources. Currently only the 'max' event is
implemented, which indicates the times the resource is about
to exceeds the max limit.

Signed-off-by: Chunguang Xu <brookxu@tencent.com>
Reviewed-by: Vipin Sharma <vipinsh@google.com>
Reviewed-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/misc_cgroup.h b/include/linux/misc_cgroup.h
index da2367e2ac1e..091f2d2a1aec 100644
--- a/include/linux/misc_cgroup.h
+++ b/include/linux/misc_cgroup.h
@@ -36,6 +36,7 @@ struct misc_cg;
 struct misc_res {
 	unsigned long max;
 	atomic_long_t usage;
+	atomic_long_t events;
 	bool failed;
 };
 
@@ -46,6 +47,10 @@ struct misc_res {
  */
 struct misc_cg {
 	struct cgroup_subsys_state css;
+
+	/* misc.events */
+	struct cgroup_file events_file;
+
 	struct misc_res res[MISC_CG_RES_TYPES];
 };