[0/3] cgroup2: introduce cpuset.mems.migration

Message

Abel Wu April 22, 2021, 9:06 a.m. UTC

Some of our services are quite performance sensitive and
actually NUMA-aware designed, aka numa-service. The SLOs
can be easily violated when co-locate numa-services with
other workloads. Thus they are granted to occupy the whole
NUMA node and when such assignment applies, the workload
on that node needs to be moved away fast and complete.

This new cgroup v2 interface is an enhancement of cgroup
v1 interface cpuset.memory_migrate by adding a new mode
called "lazy". With the help of the "lazy" mode migration
we solved the aforementioned problem on fast eviction.

Patch 1 applies cpusets limits to tasks that using default
memory policies, which makes pages inside mems_allowed are
preferred when autoNUMA is enabled. This is also necessary
for the “lazy” mode of cpuset.mems.migration.

Patch 2&3 introduce cpuset.mems.migration, see the patches
for detailed information please.

Abel Wu (3):
  mm/mempolicy: apply cpuset limits to tasks using default policy
  cgroup/cpuset: introduce cpuset.mems.migration
  docs/admin-guide/cgroup-v2: add cpuset.mems.migration

 Documentation/admin-guide/cgroup-v2.rst |  36 ++++++++
 kernel/cgroup/cpuset.c                  | 104 +++++++++++++++++++-----
 mm/mempolicy.c                          |   7 +-
 3 files changed, 124 insertions(+), 23 deletions(-)