mm/oom_kill: count global and memory cgroup oom kills
authorKonstantin Khlebnikov <khlebnikov@yandex-team.ru>
Thu, 6 Jul 2017 22:40:28 +0000 (15:40 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 6 Jul 2017 23:24:35 +0000 (16:24 -0700)
commit8e675f7af50747e1e9e96538e8706767e4f80e2c
tree86820a752aa265ae2c118d86415ca03eed486691
parent2262185c5b287f2758afda79c149b7cf6bee165c
mm/oom_kill: count global and memory cgroup oom kills

Show count of oom killer invocations in /proc/vmstat and count of
processes killed in memory cgroup in knob "memory.events" (in
memory.oom_control for v1 cgroup).

Also describe difference between "oom" and "oom_kill" in memory cgroup
documentation.  Currently oom in memory cgroup kills tasks iff shortage
has happened inside page fault.

These counters helps in monitoring oom kills - for now the only way is
grepping for magic words in kernel log.

[akpm@linux-foundation.org: fix for mem_cgroup_count_vm_event() rename]
[akpm@linux-foundation.org: fix comment, per Konstantin]
Link: http://lkml.kernel.org/r/149570810989.203600.9492483715840752937.stgit@buzz
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Roman Guschin <guroan@gmail.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Documentation/cgroup-v2.txt
include/linux/memcontrol.h
include/linux/vm_event_item.h
mm/memcontrol.c
mm/oom_kill.c
mm/vmstat.c