[S390] /proc/stat idle field for idle cpus
The cpu idle field in the output of /proc/stat is too small for cpus that have been idle for more than a tick. Add the architecture hook arch_idle_time that allows to add the not accounted idle time of a sleeping cpu without waking the cpu. The s390 implementation of arch_idle_time uses the already existing s390_idle_data per_cpu variable to find the sleep time of a neighboring idle cpu. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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@ -174,4 +174,8 @@ cputime64_to_clock_t(cputime64_t cputime)
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return __div(cputime, 4096000000ULL / USER_HZ);
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}
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cputime64_t s390_get_idle_time(int cpu);
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#define arch_idle_time(cpu) s390_get_idle_time(cpu)
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#endif /* _S390_CPUTIME_H */
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@ -240,6 +240,22 @@ void vtime_stop_cpu(void)
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}
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}
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cputime64_t s390_get_idle_time(int cpu)
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{
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struct s390_idle_data *idle;
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unsigned long long now, idle_time, idle_enter;
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idle = &per_cpu(s390_idle, cpu);
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spin_lock(&idle->lock);
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now = get_clock();
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idle_time = 0;
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idle_enter = idle->idle_enter;
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if (idle_enter != 0ULL && idle_enter < now)
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idle_time = now - idle_enter;
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spin_unlock(&idle->lock);
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return idle_time;
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}
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/*
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* Sorted add to a list. List is linear searched until first bigger
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* element is found.
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@ -18,6 +18,9 @@
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#ifndef arch_irq_stat
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#define arch_irq_stat() 0
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#endif
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#ifndef arch_idle_time
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#define arch_idle_time(cpu) 0
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#endif
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static int show_stat(struct seq_file *p, void *v)
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{
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@ -40,6 +43,7 @@ static int show_stat(struct seq_file *p, void *v)
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nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
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system = cputime64_add(system, kstat_cpu(i).cpustat.system);
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idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
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idle = cputime64_add(idle, arch_idle_time(i));
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iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
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irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
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softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
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@ -69,6 +73,7 @@ static int show_stat(struct seq_file *p, void *v)
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nice = kstat_cpu(i).cpustat.nice;
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system = kstat_cpu(i).cpustat.system;
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idle = kstat_cpu(i).cpustat.idle;
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idle = cputime64_add(idle, arch_idle_time(i));
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iowait = kstat_cpu(i).cpustat.iowait;
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irq = kstat_cpu(i).cpustat.irq;
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softirq = kstat_cpu(i).cpustat.softirq;
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