[v11 0/6] cgroup-aware OOM killer

From: Roman Gushchin
Date: Thu Oct 05 2017 - 09:05:47 EST

This patchset makes the OOM killer cgroup-aware.

- Fixed an issue with skipping the root mem cgroup
(discovered by Shakeel Butt)
- Moved a check in __oom_kill_process() to the memmory.oom_group
patch, added corresponding comments
- Added a note about ignoring tasks with oom_score_adj -1000
(proposed by Michal Hocko)
- Rebase on top of mm tree

- Separate oom_group introduction into a standalone patch
- Stop propagating oom_group
- Make oom_group delegatable
- Do not try to kill the biggest task in the first order,
if the whole cgroup is going to be killed
- Stop caching oom_score on struct memcg, optimize victim
memcg selection
- Drop dmesg printing (for further refining)
- Small refactorings and comments added here and there
- Rebase on top of mm tree

- Change siblings-to-siblings comparison to the tree-wide search,
make related refactorings
- Make oom_group implicitly propagated down by the tree
- Fix an issue with task selection in root cgroup

- Do not kill tasks with OOM_SCORE_ADJ -1000
- Make the whole thing opt-in with cgroup mount option control
- Drop oom_priority for further discussions
- Kill the whole cgroup if oom_group is set and it's
memory.max is reached
- Update docs and commit messages

- __oom_kill_process() drops reference to the victim task
- oom_score_adj -1000 is always respected
- Renamed oom_kill_all to oom_group
- Dropped oom_prio range, converted from short to int
- Added a cgroup v2 mount option to disable cgroup-aware OOM killer
- Docs updated
- Rebased on top of mmotm

- Renamed oom_control.chosen to oom_control.chosen_task
- Renamed oom_kill_all_tasks to oom_kill_all
- Per-node NR_SLAB_UNRECLAIMABLE accounting
- Several minor fixes and cleanups
- Docs updated

- Rebased on top of Michal Hocko's patches, which have changed the
way how OOM victims becoming an access to the memory
reserves. Dropped corresponding part of this patchset
- Separated the oom_kill_process() splitting into a standalone commit
- Added debug output (suggested by David Rientjes)
- Some minor fixes

- Reworked per-cgroup oom_score_adj into oom_priority
(based on ideas by David Rientjes)
- Tasks with oom_score_adj -1000 are never selected if
oom_kill_all_tasks is not set
- Memcg victim selection code is reworked, and
synchronization is based on finding tasks with OOM victim marker,
rather then on global counter
- Debug output is dropped
- Refactored TIF_MEMDIE usage

- Merged commits 1-4 into 6
- Separated oom_score_adj logic and debug output into separate commits
- Fixed swap accounting

- Reworked victim selection based on feedback
from Michal Hocko, Vladimir Davydov and Johannes Weiner
- "Kill all tasks" is now an opt-in option, by default
only one process will be killed
- Added per-cgroup oom_score_adj
- Refined oom score calculations, suggested by Vladimir Davydov
- Converted to a patchset


Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Vladimir Davydov <vdavydov.dev@xxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: kernel-team@xxxxxx
Cc: cgroups@xxxxxxxxxxxxxxx
Cc: linux-doc@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: linux-mm@xxxxxxxxx

Roman Gushchin (6):
mm, oom: refactor the oom_kill_process() function
mm: implement mem_cgroup_scan_tasks() for the root memory cgroup
mm, oom: cgroup-aware OOM killer
mm, oom: introduce memory.oom_group
mm, oom: add cgroup v2 mount option for cgroup-aware OOM killer
mm, oom, docs: describe the cgroup-aware OOM killer

Documentation/cgroup-v2.txt | 51 +++++++++
include/linux/cgroup-defs.h | 5 +
include/linux/memcontrol.h | 34 ++++++
include/linux/oom.h | 12 ++-
kernel/cgroup/cgroup.c | 10 ++
mm/memcontrol.c | 249 +++++++++++++++++++++++++++++++++++++++++++-
mm/oom_kill.c | 210 ++++++++++++++++++++++++-------------
7 files changed, 495 insertions(+), 76 deletions(-)