[Devel] [PATCH rh7 v3 0/8] oom enhancements - part 2

[Vladimir Davydov]

 - Patches 1-2 prepare memcg for upcoming changes in oom design.
 - Patch 3 reworks oom locking design so that the executioner waits for
   victim to exit. This is necessary to increase oom kill rate, which is
   essential for berserker mode.
 - Patch 4 drops unused OOM_SCAN_ABORT
 - Patch 5 introduces oom timeout.
   https://jira.sw.ru/browse/PSBM-38581
 - Patch 6 makes oom fairer when it comes to selecting a victim among
   different containers.
   https://jira.sw.ru/browse/PSBM-37915
 - Patch 7 prepares oom for introducing berserker mode
 - Patch 8 resurrects oom berserker mode, which is supposed to cope with
   actively forking processes.
   https://jira.sw.ru/browse/PSBM-17930

https://jira.sw.ru/browse/PSBM-26973

Changes in v3:
 - rework oom_trylock (patch 3)
 - select exiting process instead of aborting oom scan so as not to keep
   busy-waiting for an exiting process to exit (patches 3, 4)
 - cleanup oom timeout handling + fix stuck process trace dumped
   multiple times on timeout (patch 5)
 - set max_overdraft to ULONG_MAX on selected processes (patch 6)
 - rework oom berserker process selection logic (patches 7, 8)

Changes in v2:
 - s/time_after/time_after_eq to avoid BUG_ON in oom_trylock (patch 4)
 - propagate victim to the context that initiated oom in oom_unlock
   (patch 6)
 - always set oom_end on releasing oom context (patch 6)


Vladimir Davydov (8):
  memcg: add mem_cgroup_get/put helpers
  memcg: add lock for protecting memcg->oom_notify list
  oom: rework locking design
  oom: introduce oom timeout
  oom: drop OOM_SCAN_ABORT
  oom: rework logic behind memory.oom_guarantee
  oom: pass points and overdraft to oom_kill_process
  oom: resurrect berserker mode

 fs/proc/base.c             |   2 +-
 include/linux/memcontrol.h |  33 ++-
 include/linux/oom.h        |  46 +++-
 kernel/sysctl.c            |   7 +
 mm/memcontrol.c            | 235 +++++++--------------
 mm/oom_kill.c              | 509 ++++++++++++++++++++++++++++++++++++---------
 mm/page_alloc.c            |   6 +-
 net/packet/af_packet.c     |   4 +-
 8 files changed, 562 insertions(+), 280 deletions(-)

-- 
2.1.4