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         unsigned int user;
  18         unsigned int nice;
  19         unsigned int system;
  20         unsigned int idle;
  21         unsigned int iowait;
  22 };
  23
  24 struct kernel_stat {
  25         struct cpu_usage_stat   cpustat;
  26 #if !defined(CONFIG_ARCH_S390)
  27         unsigned int irqs[NR_IRQS];
  28 #endif
  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 nr_context_switches(void);
  38
  39 #if !defined(CONFIG_ARCH_S390)
  40 /*
  41  * Number of interrupts per specific IRQ source, since bootup
  42  */
  43 static inline int kstat_irqs(int irq)
  44 {
  45         int i, sum=0;
  46
  47         for (i = 0; i < NR_CPUS; i++)
  48                 if (cpu_possible(i))
  49                         sum += kstat_cpu(i).irqs[irq];
  50
  51         return sum;
  52 }
  53 #endif
  54
  55 #endif /* _LINUX_KERNEL_STAT_H */