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#ifndef _LINUX_KERNEL_STAT_H
#define _LINUX_KERNEL_STAT_H
 
#include <asm/irq.h>
#include <linux/smp.h>
#include <linux/threads.h>
#include <linux/percpu.h>
#include <linux/cpumask.h>
#include <asm/cputime.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 {
	cputime64_t user;
	cputime64_t nice;
	cputime64_t system;
	cputime64_t softirq;
	cputime64_t irq;
	cputime64_t idle;
	cputime64_t iowait;
	cputime64_t steal;
	cputime64_t guest;
};
 
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 long nr_context_switches(void);
 
/*
 * Number of interrupts per specific IRQ source, since bootup
 */
static inline int kstat_irqs(int irq)
{
	int cpu, sum = 0;
 
	for_each_possible_cpu(cpu)
		sum += kstat_cpu(cpu).irqs[irq];
 
	return sum;
}
 
extern void account_user_time(struct task_struct *, cputime_t);
extern void account_user_time_scaled(struct task_struct *, cputime_t);
extern void account_system_time(struct task_struct *, int, cputime_t);
extern void account_system_time_scaled(struct task_struct *, cputime_t);
extern void account_steal_time(struct task_struct *, cputime_t);
 
#endif /* _LINUX_KERNEL_STAT_H */