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#ifndef _LINUX_KERNEL_STAT_H
#define _LINUX_KERNEL_STAT_H

#include <linux/config.h>
#include <asm/irq.h>
#include <linux/smp.h>
#include <linux/threads.h>
#include <linux/percpu.h>

/*
 * 'kernel_stat.h' contains the definitions needed for doing
 * some kernel statistics (CPU usage, context switches ...),
 * used by rstatd/perfmeter
 */

struct cpu_usage_stat {
        unsigned int user;
        unsigned int nice;
        unsigned int system;
        unsigned int softirq;
        unsigned int irq;
        unsigned int idle;
        unsigned int iowait;
};

struct kernel_stat {
        struct cpu_usage_stat   cpustat;
        unsigned int irqs[NR_IRQS];
};

DECLARE_PER_CPU(struct kernel_stat, kstat);

#define kstat_cpu(cpu)  per_cpu(kstat, cpu)
/* Must have preemption disabled for this to be meaningful. */
#define kstat_this_cpu  __get_cpu_var(kstat)

extern unsigned long nr_context_switches(void);

/*
 * Number of interrupts per specific IRQ source, since bootup
 */
static inline int kstat_irqs(int irq)
{
        int i, sum=0;

        for (i = 0; i < NR_CPUS; i++)
                if (cpu_possible(i))
                        sum += kstat_cpu(i).irqs[irq];

        return sum;
}

#endif /* _LINUX_KERNEL_STAT_H */