linux-kernel - [RFC PATCH 00/10] nohz: Support sysidle (and some more cleanups)

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Date:	Sat, 19 Jul 2014 02:44:11 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: [RFC PATCH 00/10] nohz: Support sysidle (and some more cleanups)

Currently when nohz full is active, the CPU 0 handles timekeeping on
behalf of all other CPUs. This prevents it from ever entering in dynticks
idle mode.

This patchset uses the RCU sysidle feature to allow that. The CPU 0 can
know safely when to sleep and when to wake up, the sysidle code determines
that and takes care of races along the way.

git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
	nohz/sysidle

Thanks,
	Frederic
---

Frederic Weisbecker (10):
      irq_work: Introduce void irq work
      nohz: Kick full dynticks timer targets with an empty IPI
      rcu: Kick full dynticks CPU on extended grace period with a void IRQ
      nohz: Appropriate timekeeper kick on sysidle break
      smp: Fast path check on IPI list
      nohz: Define meaningful symbol for nohz full timekeeper
      nohz: Enforce timekeeping on CPU 0
      nohz: Fetch timekeeping max deferment only for timekeeper
      nohz: Switch nohz full timekeeper to dynticks idle on top of sysidle detection
      nohz: Warn on illegal timekeeper switch in nohz full


 include/linux/irq_work.h    |  1 +
 kernel/irq_work.c           | 21 +++++++++++++
 kernel/rcu/tree_plugin.h    | 10 ++++---
 kernel/sched/core.c         |  2 +-
 kernel/smp.c                | 11 ++++++-
 kernel/time/tick-common.c   | 11 ++++---
 kernel/time/tick-internal.h |  8 +++++
 kernel/time/tick-sched.c    | 72 ++++++++++++++++++++++-----------------------
 8 files changed, 88 insertions(+), 48 deletions(-)
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