include/linux/kernel_stat.h

   1 #ifndef _LINUX_KERNEL_STAT_H
   2 #define _LINUX_KERNEL_STAT_H
   3
   4 #include <linux/config.h>
   5 #include <asm/irq.h>
   6 #include <linux/smp.h>
   7 #include <linux/threads.h>
   8 #include <linux/percpu.h>
   9
  10 /*
  11  * 'kernel_stat.h' contains the definitions needed for doing
  12  * some kernel statistics (CPU usage, context switches ...),
  13  * used by rstatd/perfmeter
  14  */
  15
  16 struct cpu_usage_stat {
  17         u64 user;
  18         u64 nice;
  19         u64 system;
  20         u64 softirq;
  21         u64 irq;
  22         u64 idle;
  23         u64 iowait;
  24 };
  25
  26 struct kernel_stat {
  27         struct cpu_usage_stat   cpustat;
  28         unsigned int irqs[NR_IRQS];
  29 };
  30
  31 DECLARE_PER_CPU(struct kernel_stat, kstat);
  32
  33 #define kstat_cpu(cpu)  per_cpu(kstat, cpu)
  34 /* Must have preemption disabled for this to be meaningful. */
  35 #define kstat_this_cpu  __get_cpu_var(kstat)
  36
  37 extern unsigned long long nr_context_switches(void);
  38
  39 /*
  40  * Number of interrupts per specific IRQ source, since bootup
  41  */
  42 static inline int kstat_irqs(int irq)
  43 {
  44         int i, sum=0;
  45
  46         for (i = 0; i < NR_CPUS; i++)
  47                 if (cpu_possible(i))
  48                         sum += kstat_cpu(i).irqs[irq];
  49
  50         return sum;
  51 }
  52
  53 #endif /* _LINUX_KERNEL_STAT_H */