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

From: Jacob Pan <jacob.jun.pan@linux.intel.com>
To: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	LKML <linux-kernel@vger.kernel.org>,
	Linux PM <linux-pm@vger.kernel.org>,
	Rafael Wysocki <rafael.j.wysocki@intel.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>,
	Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
	Len Brown <lenb@kernel.org>,
	Eduardo Valentin <edubezval@gmail.com>,
	Zhang Rui <rui.zhang@intel.com>, Petr Mladek <pmladek@suse.com>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	Jacob Pan <jacob.jun.pan@linux.intel.com>
Subject: [PATCH v3 0/3] Stop sched tick in idle injection task
Date: Wed, 23 Nov 2016 12:13:07 -0800	[thread overview]
Message-ID: <1479931990-11732-1-git-send-email-jacob.jun.pan@linux.intel.com> (raw)

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(-)

-- 
1.9.1