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@xxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Li Zefan <lizefan@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
---
Hello,
Once cgroup/for-4.4 gets propagated to mm, this should apply cleanly.
Alternatively, I can apply it through the cgroup tree. Which would
you prefer?
Thanks.
include/linux/memcontrol.h | 4 ++++
mm/memcontrol.c | 1 +
2 files changed, 5 insertions(+)
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -213,6 +213,9 @@ 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;
@@ -286,6 +289,7 @@ static inline void mem_cgroup_events(str
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);
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5202,6 +5202,7 @@ 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 */
--
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