Re: [PATCH v3 0/3] Stop sched tick in idle injection task

[Rafael J. Wysocki]

On Wed, Nov 23, 2016 at 9:13 PM, Jacob Pan
<jacob.jun.pan@xxxxxxxxxxxxxxx> wrote:
> Changelog:
> v3:     - rearrange idle.c change based on Rafael's suggestion.
>
> v2:
>         - moved duration timer from powerclamp driver to play_idle()
>         - unexport cpuidle_use_deepest_state
>         - indentation fix
>
> Idle injection drivers today use RT threads to run idle loop. There are
> efficiency and accounting issues with the current intel_powerclamp.c
> and acpi_pad.c. A while ago, I posted CFS based idle injection patch trying
> to address them:
> https://lkml.org/lkml/2015/11/13/576
>
> Peter proposed another approach with the introduction of a PF_IDLE flag.
> This patchset is based on his original posting:
> https://lkml.org/lkml/2014/6/4/56
>
> These patches apply on top of the kworker and cpu hotplug state machine
> changes made to Intel powerclamp driver.
> https://lkml.org/lkml/2016/10/17/362
>
> Similar changes to ACPI PAD driver is developed along with other
> enhancements. It will be posted after this patchset is accepted.
>
> Jacob Pan (2):
>   cpuidle: allow setting deepest idle
>   thermal/powerclamp: stop sched tick in forced idle
>
> Peter Zijlstra (1):
>   idle: add support for tasks that inject idle
>
>  drivers/cpuidle/cpuidle.c          |  11 +++
>  drivers/thermal/intel_powerclamp.c |  35 +------
>  include/linux/cpu.h                |   2 +
>  include/linux/cpuidle.h            |   4 +-
>  include/linux/sched.h              |   3 +-
>  kernel/fork.c                      |   3 +
>  kernel/sched/core.c                |   1 +
>  kernel/sched/idle.c                | 183 +++++++++++++++++++++++--------------
>  8 files changed, 139 insertions(+), 103 deletions(-)

Any objections anyone?

If not, I'll queue up this series for 4.10.

Thanks,
Rafael