linux-kernel - [PATCH v5 0/2] Stop sched tick in idle injection task

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Message-Id: <1480402985-7317-1-git-send-email-jacob.jun.pan@linux.intel.com>
Date:   Mon, 28 Nov 2016 23:03:03 -0800
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     LKML <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Rafael Wysocki <rafael.j.wysocki@...el.com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Zhang Rui <rui.zhang@...el.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Len Brown <lenb@...nel.org>,
        Eduardo Valentin <edubezval@...il.com>,
        Petr Mladek <pmladek@...e.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH v5 0/2] Stop sched tick in idle injection task

Changelog:
v5:	- Fix compile error in cpuidle patch reported by 0-day.
	- Reverse patch order for correct dependency.

v4:	- Misc comments from Ingo are addressed, including style fix,
	  timeout handling, fork().
	- Dropped powerclamp patch from this set, move to its own
	  series.

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 (1):
  cpuidle: allow setting deepest idle

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

 drivers/cpuidle/cpuidle.c |  13 +++-
 include/linux/cpu.h       |   2 +
 include/linux/cpuidle.h   |   7 +-
 include/linux/sched.h     |   3 +-
 kernel/fork.c             |   2 +-
 kernel/sched/core.c       |   1 +
 kernel/sched/idle.c       | 175 +++++++++++++++++++++++++++++-----------------
 7 files changed, 133 insertions(+), 70 deletions(-)

-- 
1.9.1