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memcg: generate file modified notifications on "memory.events"

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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>
This commit is contained in:
Tejun Heo 2015-09-18 18:01:59 -04:00
parent 6f60eade24
commit 472912a2b5
2 changed files with 5 additions and 0 deletions
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4
include/linux/memcontrol.h
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@ -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(struct mem_cgroup *memcg,
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);

1
mm/memcontrol.c
View File

@ -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 */