Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753681Ab3C0PdE (ORCPT ); Wed, 27 Mar 2013 11:33:04 -0400 Received: from mail-ve0-f178.google.com ([209.85.128.178]:62734 "EHLO mail-ve0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753660Ab3C0Pc7 (ORCPT ); Wed, 27 Mar 2013 11:32:59 -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 2/4] nohz: Print final full dynticks CPUs range on boot Date: Wed, 27 Mar 2013 16:32:37 +0100 Message-Id: <1364398359-21990-3-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: 2184 Lines: 65 Given that we are applying a few restrictions on the full dynticks CPUs range (boot CPU excluded, then soon the RCU nocb subset requirement), let's print the final resulting range of full dynticks CPUs to the user so that he knows what's really going to run. 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/tick-sched.c | 16 ++++++++++++++-- 1 files changed, 14 insertions(+), 2 deletions(-) diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 74bc7f1..1eb0e35 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -196,12 +196,24 @@ static int __cpuinit tick_nohz_cpu_down_callback(struct notifier_block *nfb, return NOTIFY_OK; } +/* + * Worst case string length in chunks of CPU range seems 2 steps + * separations: 0,2,4,6,... + * This is NR_CPUS + sizeof('\0') + */ +static char __initdata nohz_ext_buf[NR_CPUS + 1]; + static int __init init_tick_nohz_extended(void) { int cpu; - if (have_nohz_extended_mask) - cpu_notifier(tick_nohz_cpu_down_callback, 0); + if (!have_nohz_extended_mask) + return 0; + + cpu_notifier(tick_nohz_cpu_down_callback, 0); + + cpulist_scnprintf(nohz_ext_buf, sizeof(nohz_ext_buf), nohz_extended_mask); + pr_info("NO_HZ: Experimental full dynticks CPUs: %s.\n", nohz_ext_buf); return 0; } -- 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/