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doc: memcontrol: add description for oom_kill 

When debugging an oom issue, I found the oom_kill counter of memcg is
confusing.  At the first glance without checking document, I thought it
just counts for memcg oom, but it turns out it counts both global and
memcg oom.

The cgroup v2 documents it, but the description is missed for cgroup v1.

Signed-off-by: Yang Shi <shy828301@gmail.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Chris Down <chris@chrisdown.name>
Link: https://lore.kernel.org/r/20210226021254.3980-1-shy828301@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Yang Shi 2021-02-25 18:12:54 -08:00 committed by Jonathan Corbet
parent abe4a3996e
commit 1eff491fc4
1 changed files with 3 additions and 0 deletions
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Documentation/admin-guide/cgroup-v1/memory.rst
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@ -851,6 +851,9 @@ At reading, current status of OOM is shown.
(if 1, oom-killer is disabled)
- under_oom 0 or 1
(if 1, the memory cgroup is under OOM, tasks may be stopped.)
- oom_kill integer counter
The number of processes belonging to this cgroup killed by any
kind of OOM killer.
11. Memory Pressure
===================