[RFC PATCH 0/2] tick/nohz: Add runtime control of non-idle tick suppression

[Peng Wang <peng_wang@linux.alibaba.com>]

Workloads and their need for periodic ticks can change after boot.
This series lets userspace choose at runtime which CPUs in the boot-time
nohz_full set retain the non-idle scheduler tick and which are permitted
to stop it, while preserving the existing isolation configuration.

The first patch adds a per-CPU tick dependency; the second exposes a
sysfs CPU list. Permission defaults to all nohz_full CPUs. Revocation
uses the existing asynchronous kick. Idle tick suppression is unchanged,
and policy persists across hotplug.

Existing cpuset partition modes do not express this independent tick
policy. Feedback on the proposed interface is welcome.

Thanks,
Peng

Peng Wang (2):
  tick/nohz: Add a policy dependency for full dynticks
  cpu: Add sysfs control of full dynticks policy

 .../ABI/testing/sysfs-devices-system-cpu      | 40 ++++++++++++
 drivers/base/cpu.c                            | 46 ++++++++++++++
 include/linux/tick.h                          |  8 ++-
 include/trace/events/timer.h                  |  3 +-
 kernel/time/tick-sched.c                      | 62 +++++++++++++++++++
 5 files changed, 156 insertions(+), 3 deletions(-)


base-commit: 0fcb05b72344f40806cbe810de8872f1698bf053