Messages in this thread Patch in this message | | | From | Muchun Song <> | Subject | [PATCH v2] mm: memcontrol: fix missing wakeup polling thread | Date | Fri, 6 Nov 2020 00:19:36 +0800 |
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When wen poll the swap.events, we can miss being waked up when the swap event occurs. Because we didn't notify.
Fixes: f3a53a3a1e5b ("mm, memcontrol: implement memory.swap.events") Signed-off-by: Muchun Song <songmuchun@bytedance.com> --- changelog in v2: - Fix problem, thanks Johannes.
include/linux/memcontrol.h | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index 0f4dd7829fb2..4f7821be5561 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -1074,12 +1074,19 @@ static inline void count_memcg_event_mm(struct mm_struct *mm, static inline void memcg_memory_event(struct mem_cgroup *memcg, enum memcg_memory_event event) { + bool swap_event = event == MEMCG_SWAP_HIGH || event == MEMCG_SWAP_MAX || + event == MEMCG_SWAP_FAIL; + atomic_long_inc(&memcg->memory_events_local[event]); - cgroup_file_notify(&memcg->events_local_file); + if (!swap_event) + cgroup_file_notify(&memcg->events_local_file); do { atomic_long_inc(&memcg->memory_events[event]); - cgroup_file_notify(&memcg->events_file); + if (swap_event) + cgroup_file_notify(&memcg->swap_events_file); + else + cgroup_file_notify(&memcg->events_file); if (!cgroup_subsys_on_dfl(memory_cgrp_subsys)) break; -- 2.20.1
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