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=-11.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 A4CA7C43215 for ; Thu, 21 Nov 2019 16:48:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 88772206CB for ; Thu, 21 Nov 2019 16:48:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727179AbfKUQsT (ORCPT ); Thu, 21 Nov 2019 11:48:19 -0500 Received: from Galois.linutronix.de ([193.142.43.55]:32914 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727109AbfKUQsS (ORCPT ); Thu, 21 Nov 2019 11:48:18 -0500 Received: from [5.158.153.53] (helo=tip-bot2.lab.linutronix.de) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1iXpcm-0000Z1-8W; Thu, 21 Nov 2019 17:48:08 +0100 Received: from [127.0.1.1] (localhost [IPv6:::1]) by tip-bot2.lab.linutronix.de (Postfix) with ESMTP id EABCB1C1A3B; Thu, 21 Nov 2019 17:48:07 +0100 (CET) Date: Thu, 21 Nov 2019 16:48:07 -0000 From: "tip-bot2 for Frederic Weisbecker" Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: sched/core] procfs: Use all-in-one vtime aware kcpustat accessor Cc: Yauheni Kaliuta , Frederic Weisbecker , Al Viro , Peter Zijlstra , Wanpeng Li , Ingo Molnar , x86 , LKML In-Reply-To: <20191121024430.19938-4-frederic@kernel.org> References: <20191121024430.19938-4-frederic@kernel.org> MIME-Version: 1.0 Message-ID: <157435488789.21853.3157956857911322483.tip-bot2@tip-bot2> X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit has been merged into the sched/core branch of tip: Commit-ID: 26dae145a76c3615588f263885904c6e567ff116 Gitweb: https://git.kernel.org/tip/26dae145a76c3615588f263885904c6e567ff116 Author: Frederic Weisbecker AuthorDate: Thu, 21 Nov 2019 03:44:27 +01:00 Committer: Ingo Molnar CommitterDate: Thu, 21 Nov 2019 07:33:24 +01:00 procfs: Use all-in-one vtime aware kcpustat accessor 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: Al Viro Cc: Peter Zijlstra Cc: Wanpeng Li Link: https://lkml.kernel.org/r/20191121024430.19938-4-frederic@kernel.org Signed-off-by: Ingo Molnar --- fs/proc/stat.c | 56 +++++++++++++++++++++++++++---------------------- 1 file changed, 31 insertions(+), 25 deletions(-) diff --git a/fs/proc/stat.c b/fs/proc/stat.c index 5c6bd0a..37bdbec 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); - - 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); + struct kernel_cpustat kcpustat; + u64 *cpustat = kcpustat.cpustat; + + 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));