linux-kernel - [PATCH 24/25] rackmeter: Use vtime aware kcpustat accessors

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Date:   Wed, 14 Nov 2018 03:46:08 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Wanpeng Li <wanpengli@...cent.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Yauheni Kaliuta <yauheni.kaliuta@...hat.com>,
        Ingo Molnar <mingo@...nel.org>, Rik van Riel <riel@...hat.com>
Subject: [PATCH 24/25] rackmeter: Use vtime aware kcpustat accessors

Now that we have a vtime safe kcpustat accessor, use it to fix 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@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Wanpeng Li <wanpengli@...cent.com>
Cc: Ingo Molnar <mingo@...nel.org>
---
 drivers/macintosh/rack-meter.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/macintosh/rack-meter.c b/drivers/macintosh/rack-meter.c
index 1f29d24..1936e0ec 100644
--- a/drivers/macintosh/rack-meter.c
+++ b/drivers/macintosh/rack-meter.c
@@ -83,13 +83,19 @@ static int rackmeter_ignore_nice;
  */
 static inline u64 get_cpu_idle_time(unsigned int cpu)
 {
+	struct kernel_cpustat *kcpustat = &kcpustat_cpu(cpu);
 	u64 retval;
 
-	retval = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE] +
-		 kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
+	retval = kcpustat->cpustat[CPUTIME_IDLE] +
+		 kcpustat->cpustat[CPUTIME_IOWAIT];
 
-	if (rackmeter_ignore_nice)
-		retval += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE];
+	if (rackmeter_ignore_nice) {
+		u64 user, nice, sys, guest, guest_nice;
+
+		kcpustat_cputime(kcpustat, cpu, &user, &nice, &sys,
+				 &guest, &guest_nice);
+		retval += nice;
+	}
 
 	return retval;
 }
-- 
2.7.4