Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752746AbaB0MRO (ORCPT ); Thu, 27 Feb 2014 07:17:14 -0500 Received: from mail-ea0-f171.google.com ([209.85.215.171]:58893 "EHLO mail-ea0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751717AbaB0MRM (ORCPT ); Thu, 27 Feb 2014 07:17:12 -0500 Date: Thu, 27 Feb 2014 13:17:07 +0100 From: Ingo Molnar To: Frederic Weisbecker Cc: LKML , "Paul E. McKenney" , Paul Gortmaker , Peter Zijlstra , Steven Rostedt , Thomas Gleixner , Viresh Kumar Subject: Re: [GIT PULL] timers update for 3.15 Message-ID: <20140227121707.GE9712@gmail.com> References: <1393433525-5765-1-git-send-email-fweisbec@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1393433525-5765-1-git-send-email-fweisbec@gmail.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Frederic Weisbecker wrote: > Ingo, > > Please pull the timers/core branch that can be found at: > > git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git > timers/core > --- > > * The patch from Viresh removes some unecessary scheduler IPIs that wake > up the CPUs when deferrable timers are enqueued on remote targets. > > In practice I have seen on boot some of these IPIs from various > sources: MCE, vmstat/SLAB, cpufreq. They happen either on initcall > or cpu hotplug. Since these timers are enqueued on all CPUs, there > are some potential big rounds of IPIs that are spared with this patch. > > But it's just what I've seen on my own machine on boot. I expect some > more scenarios where a few IPIs will be avoided depending on configs > and usecases because we have some more users of deferrable timers. > > * Kconfig text made clearer for full dynticks by Paul Gortmaker. > > Thanks, > Frederic > --- > > Paul Gortmaker (1): > nohz: ensure users are aware boot CPU is not NO_HZ_FULL > > Viresh Kumar (1): > timer: Spare IPI when deferrable timer is queued on idle remote targets > > > kernel/time/Kconfig | 2 +- > kernel/timer.c | 9 ++++++++- > 2 files changed, 9 insertions(+), 2 deletions(-) So I wanted to pull this fine set of commits, just to discover that Thomas already pulled it into timers/core :-) Ingo -- 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/