memcg: generate file modified notifications on "memory.events"
cgroup core only recently grew generic notification support. Wire up
"memory.events" so that it triggers a file modified event whenever its
content changes.
v2: Refreshed on top of mem_cgroup relocation.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Michal Hocko <mhocko@kernel.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Li Zefan <lizefan@huawei.com>
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 9aa7820..c83c699 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -213,6 +213,9 @@
/* OOM-Killer disable */
int oom_kill_disable;
+ /* handle for "memory.events" */
+ struct cgroup_file events_file;
+
/* protect arrays of thresholds */
struct mutex thresholds_lock;
@@ -286,6 +289,7 @@
unsigned int nr)
{
this_cpu_add(memcg->stat->events[idx], nr);
+ cgroup_file_notify(&memcg->events_file);
}
bool mem_cgroup_low(struct mem_cgroup *root, struct mem_cgroup *memcg);