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

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Date:   Wed,  9 Nov 2016 11:05:09 -0800
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     LKML <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>
Cc:     Zhang Rui <rui.zhang@...el.com>,
        Rafael Wysocki <rafael.j.wysocki@...el.com>,
        "Chen, Yu C" <yu.c.chen@...el.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Petr Mladek <pmladek@...e.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH 0/3] Stop sched tick in idle injection task

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: use PF_IDLE in injection kthread

Peter Zijlstra (1):
  idle: add support for tasks that inject idle

 drivers/cpuidle/cpuidle.c          |  12 +++
 drivers/thermal/intel_powerclamp.c |  58 ++++++---------
 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                | 147 +++++++++++++++++++++----------------
 8 files changed, 130 insertions(+), 100 deletions(-)

-- 
1.9.1