linux-kernel - [PATCH 12/14] procfs: Use vtime aware kcpustat accessor to fetch CPUTIME

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Date:   Wed, 16 Oct 2019 04:56:58 +0200
From:   Frederic Weisbecker <frederic@...nel.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Wanpeng Li <wanpengli@...cent.com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Rik van Riel <riel@...riel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Yauheni Kaliuta <yauheni.kaliuta@...hat.com>,
        Ingo Molnar <mingo@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Pavel Machek <pavel@....cz>
Subject: [PATCH 12/14] procfs: Use vtime aware kcpustat accessor to fetch CPUTIME_SYSTEM

Now that we have a vtime safe kcpustat accessor for CPUTIME_SYSTEM, use
it to start fixing frozen kcpustat values on nohz_full CPUs.

Reported-by: Yauheni Kaliuta <yauheni.kaliuta@...hat.com>
Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
Cc: Yauheni Kaliuta <yauheni.kaliuta@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Rik van Riel <riel@...riel.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Wanpeng Li <wanpengli@...cent.com>
Cc: Ingo Molnar <mingo@...nel.org>
---
 fs/proc/stat.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/proc/stat.c b/fs/proc/stat.c
index 80c305f206bb..5c6bd0ae3802 100644
--- a/fs/proc/stat.c
+++ b/fs/proc/stat.c
@@ -124,7 +124,7 @@ static int show_stat(struct seq_file *p, void *v)
 
 		user += kcs->cpustat[CPUTIME_USER];
 		nice += kcs->cpustat[CPUTIME_NICE];
-		system += kcs->cpustat[CPUTIME_SYSTEM];
+		system += kcpustat_field(kcs, CPUTIME_SYSTEM, i);
 		idle += get_idle_time(kcs, i);
 		iowait += get_iowait_time(kcs, i);
 		irq += kcs->cpustat[CPUTIME_IRQ];
@@ -162,7 +162,7 @@ static int show_stat(struct seq_file *p, void *v)
 		/* Copy values here to work around gcc-2.95.3, gcc-2.96 */
 		user = kcs->cpustat[CPUTIME_USER];
 		nice = kcs->cpustat[CPUTIME_NICE];
-		system = kcs->cpustat[CPUTIME_SYSTEM];
+		system = kcpustat_field(kcs, CPUTIME_SYSTEM, i);
 		idle = get_idle_time(kcs, i);
 		iowait = get_iowait_time(kcs, i);
 		irq = kcs->cpustat[CPUTIME_IRQ];
-- 
2.23.0