Add oom counter to memory.stat file. oom shows amount of oom kills
triggered due to cgroup's memory limit. total_oom shows total sum of
oom kills triggered due to cgroup's and it's sub-groups memory limits.
memory.stat in the root cgroup counts global oom kills.
E.g:
# mkdir /sys/fs/cgroup/memory/test/
# echo 100M > /sys/fs/cgroup/memory/test/memory.limit_in_bytes
# echo 100M > /sys/fs/cgroup/memory/test/memory.memsw.limit_in_bytes
# echo $$ > /sys/fs/cgroup/memory/test/tasks
# ./vm-scalability/usemem -O 200M
# grep oom /sys/fs/cgroup/memory/test/memory.stat
oom 1
total_oom 1
# echo -1 > /sys/fs/cgroup/memory/test/memory.memsw.limit_in_bytes
# echo -1 > /sys/fs/cgroup/memory/test/memory.limit_in_bytes
# ./vm-scalability/usemem -O 1000G
# grep oom /sys/fs/cgroup/memory/memory.stat
oom 1
total_oom 2
https://jira.sw.ru/browse/PSBM-107731
Signed-off-by: Andrey Ryabinin <aryabi...@virtuozzo.com>
---
mm/memcontrol.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 6587cc2ef019..fe06c7db2ad3 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -400,6 +400,7 @@ struct mem_cgroup {
struct mem_cgroup_stat_cpu __percpu *stat;
struct mem_cgroup_stat2_cpu stat2;
spinlock_t pcp_counter_lock;
+ atomic_long_t oom;
atomic_t dead_count;
#if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_INET)
@@ -2005,6 +2006,7 @@ void mem_cgroup_note_oom_kill(struct mem_cgroup
*root_memcg,
if (memcg == root_memcg)
break;
}
+ atomic_long_inc(&root_memcg->oom);
if (memcg_to_put)
css_put(&memcg_to_put->css);
@@ -5691,6 +5693,7 @@ static int memcg_stat_show(struct cgroup *cont, struct
cftype *cft,
for (i = 0; i < MEM_CGROUP_EVENTS_NSTATS; i++)
seq_printf(m, "%s %lu\n", mem_cgroup_events_names[i],
mem_cgroup_read_events(memcg, i));
+ seq_printf(m, "oom %lu\n", atomic_long_read(&memcg->oom));
for (i = 0; i < NR_LRU_LISTS; i++)
seq_printf(m, "%s %lu\n", mem_cgroup_lru_names[i],
@@ -5733,6 +5736,12 @@ static int memcg_stat_show(struct cgroup *cont, struct
cftype *cft,
seq_printf(m, "total_%s %llu\n",
mem_cgroup_events_names[i], val);
}
+ {
+ unsigned long val = 0;
+ for_each_mem_cgroup_tree(mi, memcg)
+ val += atomic_long_read(&mi->oom);
+ seq_printf(m, "total_oom %lu\n", val);
+ }
for (i = 0; i < NR_LRU_LISTS; i++) {
unsigned long long val = 0;
--
2.26.2
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