Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753840Ab3C0PdO (ORCPT ); Wed, 27 Mar 2013 11:33:14 -0400 Received: from mail-ve0-f179.google.com ([209.85.128.179]:47422 "EHLO mail-ve0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753660Ab3C0PdK (ORCPT ); Wed, 27 Mar 2013 11:33:10 -0400 From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Andrew Morton , Chris Metcalf , Christoph Lameter , Geoff Levand , Gilad Ben Yossef , Hakan Akkan , Ingo Molnar , Kevin Hilman , Li Zhong , Namhyung Kim , "Paul E. McKenney" , Paul Gortmaker , Peter Zijlstra , Steven Rostedt , Thomas Gleixner Subject: [PATCH 4/4] nohz: New option to force all CPUs in full dynticks range Date: Wed, 27 Mar 2013 16:32:39 +0100 Message-Id: <1364398359-21990-5-git-send-email-fweisbec@gmail.com> X-Mailer: git-send-email 1.7.5.4 In-Reply-To: <1364398359-21990-1-git-send-email-fweisbec@gmail.com> References: <1364398359-21990-1-git-send-email-fweisbec@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2605 Lines: 77 Provide a new kernel config that forces all CPUs to be part of the full dynticks range, except the boot one for timekeeping. This is helpful for those who don't need a finegrained range of full dynticks CPU and also for automated testing. Suggested-by: Ingo Molnar Signed-off-by: Frederic Weisbecker Cc: Andrew Morton Cc: Chris Metcalf Cc: Christoph Lameter Cc: Geoff Levand Cc: Gilad Ben Yossef Cc: Hakan Akkan Cc: Ingo Molnar Cc: Kevin Hilman Cc: Li Zhong Cc: Namhyung Kim Cc: Paul E. McKenney Cc: Paul Gortmaker Cc: Peter Zijlstra Cc: Steven Rostedt Cc: Thomas Gleixner --- kernel/time/Kconfig | 10 ++++++++++ kernel/time/tick-sched.c | 5 +++++ 2 files changed, 15 insertions(+), 0 deletions(-) diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig index 5a87c03..407d771 100644 --- a/kernel/time/Kconfig +++ b/kernel/time/Kconfig @@ -98,6 +98,16 @@ config NO_HZ_EXTENDED Say N. +config NO_HZ_EXTENDED_ALL + bool "Full dynticks system on all CPUs" + depends on NO_HZ_EXTENDED + help + Force all CPUs to be full dynticks. The range specified in the + nohz_extended boot option will then be ignored. + + Note the boot CPU will still be kept outside the range to handle + the timekeeping duty. + config HIGH_RES_TIMERS bool "High Resolution Timer Support" depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index a76d95e..0a3952c 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -161,10 +161,15 @@ static int __init tick_nohz_extended_setup(char *str) int cpu; alloc_bootmem_cpumask_var(&nohz_extended_mask); + +#ifdef CONFIG_NO_HZ_EXTENDED_ALL + cpumask_setall(nohz_extended_mask); +#else if (cpulist_parse(str, nohz_extended_mask) < 0) { pr_warning("NOHZ: Incorrect nohz_extended cpumask\n"); return 1; } +#endif cpu = smp_processor_id(); if (cpumask_test_cpu(cpu, nohz_extended_mask)) { -- 1.7.5.4 -- 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/