[0/2] sched/fair: Wake task within the cluster when possible

Message

Yicong Yang Dec. 15, 2021, 4:11 a.m. UTC

This is the follow-up work to support cluster scheduler. Previously
we have added cluster level in the scheduler for both ARM64[1] and
X86[2] to support load balance between clusters to bring more memory
bandwidth and decrease cache contention. This patchset, on the other
hand, takes care of wake-up path by giving CPUs within the same cluster
a try before scanning the whole LLC to benefit those tasks communicating
with each other.

[1] 778c558f49a2 ("sched: Add cluster scheduler level in core and related Kconfig for ARM64")
[2] 66558b730f25 ("sched: Add cluster scheduler level for x86")

Barry Song (2):
  sched: Add per_cpu cluster domain info and cpus_share_cluster API
  sched/fair: Scan cluster before scanning LLC in wake-up path

 include/linux/sched/sd_flags.h |  5 ++++
 include/linux/sched/topology.h |  8 +++++-
 kernel/sched/core.c            | 12 +++++++++
 kernel/sched/fair.c            | 46 +++++++++++++++++++++++++++++++---
 kernel/sched/sched.h           |  2 ++
 kernel/sched/topology.c        |  9 +++++++
 6 files changed, 77 insertions(+), 5 deletions(-)