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mm/oom_kill: count global and memory cgroup oom kills

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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.

[[email protected]: fix for mem_cgroup_count_vm_event() rename]
[[email protected]: fix comment, per Konstantin]
Link: http://lkml.kernel.org/r/149570810989.203600.9492483715840752937.stgit@buzz
Signed-off-by: Konstantin Khlebnikov <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Tetsuo Handa <[email protected]>
Cc: Roman Guschin <[email protected]>
Cc: David Rientjes <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Konstantin Khlebnikov 2017-07-06 15:40:28 -07:00 • committed by Linus Torvalds
commit 8e675f7af5
6 changed files with 29 additions and 5 deletions
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1
mm/vmstat.c
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@ -1018,6 +1018,7 @@ const char * const vmstat_text[] = {
"drop_pagecache",
"drop_slab",
"oom_kill",
#ifdef CONFIG_NUMA_BALANCING
"numa_pte_updates",