Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755578Ab2KHNPI (ORCPT ); Thu, 8 Nov 2012 08:15:08 -0500 Received: from mail-wi0-f178.google.com ([209.85.212.178]:58141 "EHLO mail-wi0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751721Ab2KHNPG (ORCPT ); Thu, 8 Nov 2012 08:15:06 -0500 From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Andrew Morton , Steven Rostedt , Paul Gortmaker , Anish Kumar Subject: [PATCH 0/7] printk: Make it usable on nohz CPUs v4 Date: Thu, 8 Nov 2012 14:14:51 +0100 Message-Id: <1352380498-23132-1-git-send-email-fweisbec@gmail.com> X-Mailer: git-send-email 1.7.5.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2946 Lines: 76 Hi, There are rough changes in this series, the patchset is much simpler: * Include the two fixes for SMP-safe irq_work claim [1/7],[2/7] * Split the part that prevent to stop the tick with pending work on the queue, to make the review easier. * Don't care anymore whether the arch can send self-IPIs or not. The real point of it is for when we stop the tick outside idle, we'll require the self IPI support from arch. We'll deal with that later. * Drop the set_need_resched() hack when we enqueue in dyntick idle mode. I'm just too worried that printk() calls in idle loop may prevent the tick from ever beeing stopped, and even the CPU from halting. * When the work is lazy, just never raise unless the tick is stopped. We don't care whether the arch has obscure way to raise it or not. In any case, the hook in update_process_times() can take care of it. * Don't raise an IPI after queueing if there is a pending one already. * Use per cpu irq work for printk because the printk_pending flags are per CPU and thus can't be handled remotely. * Queue an irq work in case of printk_sched() as well. You can fetch from: git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git nohz/printk-v4 Thanks. Frederic Weisbecker (7): irq_work: Fix racy IRQ_WORK_BUSY flag setting irq_work: Fix racy check on work pending flag irq_work: Remove CONFIG_HAVE_IRQ_WORK nohz: Add API to check tick state irq_work: Don't stop the tick with pending works irq_work: Make self-IPIs optable printk: Wake up klogd using irq_work arch/alpha/Kconfig | 1 - arch/arm/Kconfig | 1 - arch/arm64/Kconfig | 1 - arch/blackfin/Kconfig | 1 - arch/frv/Kconfig | 1 - arch/hexagon/Kconfig | 1 - arch/mips/Kconfig | 1 - arch/parisc/Kconfig | 1 - arch/powerpc/Kconfig | 1 - arch/s390/Kconfig | 1 - arch/sh/Kconfig | 1 - arch/sparc/Kconfig | 1 - arch/x86/Kconfig | 1 - drivers/staging/iio/trigger/Kconfig | 1 - include/linux/irq_work.h | 20 +++++++++ include/linux/printk.h | 3 - include/linux/tick.h | 17 +++++++- init/Kconfig | 5 +-- kernel/irq_work.c | 76 +++++++++++++++++++++++----------- kernel/printk.c | 36 +++++++++------- kernel/time/tick-sched.c | 7 ++- kernel/timer.c | 1 - 22 files changed, 112 insertions(+), 67 deletions(-) -- 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/