diff options
| author |   Frederic Weisbecker <frederic@kernel.org> | 2019-11-21 03:44:28 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2019-11-21 07:33:25 +0100 |
| commit | 5720821ba1d845f0b91a9278137e9005c5f6931d (patch) | |
| tree | cbabd3e2817824ad1d672ab4ed8599892f9f444b /drivers/cpufreq/cpufreq.c | |
| parent | procfs: Use all-in-one vtime aware kcpustat accessor (diff) | |
| download | linux-dev-5720821ba1d845f0b91a9278137e9005c5f6931d.tar.xz linux-dev-5720821ba1d845f0b91a9278137e9005c5f6931d.zip | |
cpufreq: Use vtime aware kcpustat accessors for user time
We can now safely read user and guest kcpustat fields on nohz_full CPUs.
Use the appropriate accessors.
Reported-by: Yauheni Kaliuta <yauheni.kaliuta@redhat.com>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wanpeng Li <wanpengli@tencent.com>
Link: https://lkml.kernel.org/r/20191121024430.19938-5-frederic@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/cpufreq/cpufreq.c')
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 527fd068dc12..ee23eaf20f35 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -113,18 +113,21 @@ EXPORT_SYMBOL_GPL(get_governor_parent_kobj); static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall) { - u64 idle_time; + struct kernel_cpustat kcpustat; u64 cur_wall_time; + u64 idle_time; u64 busy_time; cur_wall_time = jiffies64_to_nsecs(get_jiffies_64()); - busy_time = kcpustat_cpu(cpu).cpustat[CPUTIME_USER]; - busy_time += kcpustat_field(&kcpustat_cpu(cpu), CPUTIME_SYSTEM, cpu); - busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_IRQ]; - busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SOFTIRQ]; - busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_STEAL]; - busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE]; + kcpustat_cpu_fetch(&kcpustat, cpu); + + busy_time = kcpustat.cpustat[CPUTIME_USER]; + busy_time += kcpustat.cpustat[CPUTIME_SYSTEM]; + busy_time += kcpustat.cpustat[CPUTIME_IRQ]; + busy_time += kcpustat.cpustat[CPUTIME_SOFTIRQ]; + busy_time += kcpustat.cpustat[CPUTIME_STEAL]; + busy_time += kcpustat.cpustat[CPUTIME_NICE]; idle_time = cur_wall_time - busy_time; if (wall) |