Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755868AbaGSAo3 (ORCPT ); Fri, 18 Jul 2014 20:44:29 -0400 Received: from mail-we0-f181.google.com ([74.125.82.181]:47672 "EHLO mail-we0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751530AbaGSAo2 (ORCPT ); Fri, 18 Jul 2014 20:44:28 -0400 From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Ingo Molnar , "Paul E. McKenney" , Peter Zijlstra , Steven Rostedt , Thomas Gleixner , Viresh Kumar Subject: [RFC PATCH 00/10] nohz: Support sysidle (and some more cleanups) Date: Sat, 19 Jul 2014 02:44:11 +0200 Message-Id: <1405730661-9355-1-git-send-email-fweisbec@gmail.com> X-Mailer: git-send-email 1.8.3.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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(-) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/