cgroup core only recently grew generic notification support. Wire up
"memory.events" so that it triggers a file modified event whenever its
content changes.
Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
Cc: Li Zefan <lizefan@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
---
mm/memcontrol.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 78ba418..10db5f1 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -295,6 +295,9 @@ struct mem_cgroup {
/* OOM-Killer disable */
int oom_kill_disable;
+ /* handle for "memory.events" */
+ struct cgroup_file events_file;
+
/* protect arrays of thresholds */
struct mutex thresholds_lock;
@@ -5499,6 +5502,7 @@ static struct cftype memory_files[] = {
{
.name = "events",
.flags = CFTYPE_NOT_ON_ROOT,
+ .file_offset = offsetof(struct mem_cgroup, events_file),
.seq_show = memory_events_show,
},
{ } /* terminate */
@@ -5530,6 +5534,7 @@ void mem_cgroup_events(struct mem_cgroup *memcg,
unsigned int nr)
{
this_cpu_add(memcg->stat->events[idx], nr);
+ cgroup_file_notify(&memcg->events_file);
}
/**
--
2.4.3
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