Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752371AbaBNMNO (ORCPT ); Fri, 14 Feb 2014 07:13:14 -0500 Received: from mail-wi0-f173.google.com ([209.85.212.173]:37499 "EHLO mail-wi0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751525AbaBNMMt (ORCPT ); Fri, 14 Feb 2014 07:12:49 -0500 From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , "Paul E. McKenney" , Paul Gortmaker , Ingo Molnar , Peter Zijlstra , Steven Rostedt , Thomas Gleixner , Viresh Kumar Subject: [PATCH 0/2] dynticks: A few updates Date: Fri, 14 Feb 2014 13:12:38 +0100 Message-Id: <1392379960-4758-1-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 Hi, A small pair of updates for the dynticks code. The patch from Viresh removes a few scheduler IPIs that I have seen on boot which are there to wake up CPUs when some deferrable timers are enqueued. Those were enqueued on all CPUs so there is a possible big round of IPI. And those can be avoided with the first patch. On my machine the main sources of these were MCE, vmstat/SLAB, cpufreq. They happen either on initcall or cpu hotplug. But deferrable timers happen anytime, not just at boot. It depends on your config and your load. So the positive impact of the first patch should be broader. git://git.kernel.org/pub/scm/linux/kernel/git/frederic/dynticks-testing.git timers/core Thanks. --- 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(-) -- 1.8.3.1 -- 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/