From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 17D46C432C0 for ; Thu, 21 Nov 2019 02:44:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E3F4120895 for ; Thu, 21 Nov 2019 02:44:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574304290; bh=bVTtftvy/497ZG5CBfJ+tdQkUTY2Eip4rA9yqOgTedc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=FmL7J7/WEdNYw4R2FHBccZozD1FW8qZYb3hmX8QFin3j/LuItVnY2aTzL0r7+coel Vvdw8bhHIaAdW8pcZFSYFnyesQwQEA11r819weiDL/b/DheD6xdme86tYC+XkvXdI/ eTGR/vbJtzRyoJTk+RuYzteTjQsHEq2a7WOFTEdw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726909AbfKUCot (ORCPT ); Wed, 20 Nov 2019 21:44:49 -0500 Received: from mail.kernel.org ([198.145.29.99]:54318 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726840AbfKUCop (ORCPT ); Wed, 20 Nov 2019 21:44:45 -0500 Received: from lenoir.home (lfbn-ncy-1-150-155.w83-194.abo.wanadoo.fr [83.194.232.155]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A42532089D; Thu, 21 Nov 2019 02:44:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574304285; bh=bVTtftvy/497ZG5CBfJ+tdQkUTY2Eip4rA9yqOgTedc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bLPkw3IrS8wi7V+ItSmG0FlnLfYxSpzZQm44Oi3df/1wpCJBeweCO/W4PrHjugR84 ezxljgQQhJdHK3/HZO3L2tCMP2lH/eV0u7irndM0pGGV/FnHmjplf7tQb/GjLt6Gfr fzglAYtPjYqaazgkZOkrY2S6a4cGFX7Tsj6qmaDg= From: Frederic Weisbecker To: Peter Zijlstra , Ingo Molnar Cc: LKML , Frederic Weisbecker , Jacek Anaszewski , Wanpeng Li , "Rafael J . Wysocki" , Benjamin Herrenschmidt , Rik van Riel , Thomas Gleixner , Yauheni Kaliuta , Viresh Kumar , Pavel Machek Subject: [PATCH 3/6] procfs: Use all-in-one vtime aware kcpustat accessor Date: Thu, 21 Nov 2019 03:44:27 +0100 Message-Id: <20191121024430.19938-4-frederic@kernel.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191121024430.19938-1-frederic@kernel.org> References: <20191121024430.19938-1-frederic@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Now that we can read also user and guest time safely under vtime, use the relevant accessor to fix frozen kcpustat values on nohz_full CPUs. Reported-by: Yauheni Kaliuta Signed-off-by: Frederic Weisbecker Cc: Yauheni Kaliuta Cc: Thomas Gleixner Cc: Rik van Riel Cc: Peter Zijlstra Cc: Wanpeng Li Cc: Ingo Molnar --- fs/proc/stat.c | 54 ++++++++++++++++++++++++++++---------------------- 1 file changed, 30 insertions(+), 24 deletions(-) diff --git a/fs/proc/stat.c b/fs/proc/stat.c index 5c6bd0ae3802..37bdbec5b402 100644 --- a/fs/proc/stat.c +++ b/fs/proc/stat.c @@ -120,20 +120,23 @@ static int show_stat(struct seq_file *p, void *v) getboottime64(&boottime); for_each_possible_cpu(i) { - struct kernel_cpustat *kcs = &kcpustat_cpu(i); + struct kernel_cpustat kcpustat; + u64 *cpustat = kcpustat.cpustat; - user += kcs->cpustat[CPUTIME_USER]; - nice += kcs->cpustat[CPUTIME_NICE]; - system += kcpustat_field(kcs, CPUTIME_SYSTEM, i); - idle += get_idle_time(kcs, i); - iowait += get_iowait_time(kcs, i); - irq += kcs->cpustat[CPUTIME_IRQ]; - softirq += kcs->cpustat[CPUTIME_SOFTIRQ]; - steal += kcs->cpustat[CPUTIME_STEAL]; - guest += kcs->cpustat[CPUTIME_GUEST]; - guest_nice += kcs->cpustat[CPUTIME_GUEST_NICE]; - sum += kstat_cpu_irqs_sum(i); - sum += arch_irq_stat_cpu(i); + kcpustat_cpu_fetch(&kcpustat, i); + + user += cpustat[CPUTIME_USER]; + nice += cpustat[CPUTIME_NICE]; + system += cpustat[CPUTIME_SYSTEM]; + idle += get_idle_time(&kcpustat, i); + iowait += get_iowait_time(&kcpustat, i); + irq += cpustat[CPUTIME_IRQ]; + softirq += cpustat[CPUTIME_SOFTIRQ]; + steal += cpustat[CPUTIME_STEAL]; + guest += cpustat[CPUTIME_GUEST]; + guest_nice += cpustat[CPUTIME_USER]; + sum += kstat_cpu_irqs_sum(i); + sum += arch_irq_stat_cpu(i); for (j = 0; j < NR_SOFTIRQS; j++) { unsigned int softirq_stat = kstat_softirqs_cpu(j, i); @@ -157,19 +160,22 @@ static int show_stat(struct seq_file *p, void *v) seq_putc(p, '\n'); for_each_online_cpu(i) { - struct kernel_cpustat *kcs = &kcpustat_cpu(i); + struct kernel_cpustat kcpustat; + u64 *cpustat = kcpustat.cpustat; + + kcpustat_cpu_fetch(&kcpustat, i); /* Copy values here to work around gcc-2.95.3, gcc-2.96 */ - user = kcs->cpustat[CPUTIME_USER]; - nice = kcs->cpustat[CPUTIME_NICE]; - system = kcpustat_field(kcs, CPUTIME_SYSTEM, i); - idle = get_idle_time(kcs, i); - iowait = get_iowait_time(kcs, i); - irq = kcs->cpustat[CPUTIME_IRQ]; - softirq = kcs->cpustat[CPUTIME_SOFTIRQ]; - steal = kcs->cpustat[CPUTIME_STEAL]; - guest = kcs->cpustat[CPUTIME_GUEST]; - guest_nice = kcs->cpustat[CPUTIME_GUEST_NICE]; + user = cpustat[CPUTIME_USER]; + nice = cpustat[CPUTIME_NICE]; + system = cpustat[CPUTIME_SYSTEM]; + idle = get_idle_time(&kcpustat, i); + iowait = get_iowait_time(&kcpustat, i); + irq = cpustat[CPUTIME_IRQ]; + softirq = cpustat[CPUTIME_SOFTIRQ]; + steal = cpustat[CPUTIME_STEAL]; + guest = cpustat[CPUTIME_GUEST]; + guest_nice = cpustat[CPUTIME_USER]; seq_printf(p, "cpu%d", i); seq_put_decimal_ull(p, " ", nsec_to_clock_t(user)); seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice)); -- 2.23.0