[v2,0/4] memcg: robust enforcement of memory.high

Message

Shakeel Butt Feb. 11, 2022, 6:49 a.m. UTC

Due to the semantics of memory.high enforcement i.e. throttle the
workload without oom-kill, we are trying to use it for right sizing the
workloads in our production environment. However we observed the
mechanism fails for some specific applications which does big chunck of
allocations in a single syscall. The reason behind this failure is due
to the limitation of the memory.high enforcement's current
implementation. This patch series solves this issue by enforcing the
memory.high synchronously if the current process has accumulated a large
amount of high overcharge.

Changes since v1:
- Based on Roman's comment simply the sync enforcement and only target
  the extreme cases.

Shakeel Butt (4):
  memcg: refactor mem_cgroup_oom
  memcg: unify force charging conditions
  selftests: memcg: test high limit for single entry allocation
  memcg: synchronously enforce memory.high for large overcharges

 mm/memcontrol.c                               | 66 +++++++---------
 tools/testing/selftests/cgroup/cgroup_util.c  | 15 +++-
 tools/testing/selftests/cgroup/cgroup_util.h  |  1 +
 .../selftests/cgroup/test_memcontrol.c        | 78 +++++++++++++++++++
 4 files changed, 120 insertions(+), 40 deletions(-)