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

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Message-ID: <CAJZ5v0g6==h_qBQ1x6wbV+N3MjjWRb-iNmF4OShFrD0qR2L9JA@mail.gmail.com>
Date:   Wed, 23 Nov 2016 22:12:46 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Rafael Wysocki <rafael.j.wysocki@...el.com>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Len Brown <lenb@...nel.org>,
        Eduardo Valentin <edubezval@...il.com>,
        Zhang Rui <rui.zhang@...el.com>,
        Petr Mladek <pmladek@...e.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: Re: [PATCH v3 0/3] Stop sched tick in idle injection task

On Wed, Nov 23, 2016 at 9:13 PM, Jacob Pan
<jacob.jun.pan@...ux.intel.com> 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