kernel_stat.h

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#ifndef _LINUX_KERNEL_STAT_H
#define _LINUX_KERNEL_STAT_H

#include <linux/smp.h>
#include <linux/threads.h>
#include <linux/percpu.h>
#include <linux/cpumask.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <asm/irq.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
 */

enum cpu_usage_stat {
    CPUTIME_USER,
    CPUTIME_NICE,
    CPUTIME_SYSTEM,
    CPUTIME_SOFTIRQ,
    CPUTIME_IRQ,
    CPUTIME_IDLE,
    CPUTIME_IOWAIT,
    CPUTIME_STEAL,
    CPUTIME_GUEST,
    CPUTIME_GUEST_NICE,
    NR_STATS,
};

struct kernel_cpustat {
    u64 cpustat[NR_STATS];
};

struct kernel_stat {
#ifndef CONFIG_GENERIC_HARDIRQS
       unsigned int irqs[NR_IRQS];
#endif
    unsigned long irqs_sum;
    unsigned int softirqs[NR_SOFTIRQS];
};

DECLARE_PER_CPU(struct kernel_stat, kstat);
DECLARE_PER_CPU(struct kernel_cpustat, kernel_cpustat);

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

extern unsigned long long nr_context_switches(void);

#ifndef CONFIG_GENERIC_HARDIRQS

struct irq_desc;

static inline void kstat_incr_irqs_this_cpu(unsigned int irq,
                        struct irq_desc *desc)
{
    __this_cpu_inc(kstat.irqs[irq]);
    __this_cpu_inc(kstat.irqs_sum);
}

static inline unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
{
       return kstat_cpu(cpu).irqs[irq];
}
#else
#include <linux/irq.h>
extern unsigned int kstat_irqs_cpu(unsigned int irq, int cpu);

#define kstat_incr_irqs_this_cpu(irqno, DESC)       \
do {                            \
    __this_cpu_inc(*(DESC)->kstat_irqs);        \
    __this_cpu_inc(kstat.irqs_sum);         \
} while (0)

#endif

static inline void kstat_incr_softirqs_this_cpu(unsigned int irq)
{
    __this_cpu_inc(kstat.softirqs[irq]);
}

static inline unsigned int kstat_softirqs_cpu(unsigned int irq, int cpu)
{
       return kstat_cpu(cpu).softirqs[irq];
}

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

    for_each_possible_cpu(cpu)
        sum += kstat_irqs_cpu(irq, cpu);

    return sum;
}
#else
extern unsigned int kstat_irqs(unsigned int irq);
#endif

/*
 * Number of interrupts per cpu, since bootup
 */
static inline unsigned int kstat_cpu_irqs_sum(unsigned int cpu)
{
    return kstat_cpu(cpu).irqs_sum;
}

/*
 * Lock/unlock the current runqueue - to extract task statistics:
 */
extern unsigned long long task_delta_exec(struct task_struct *);

extern void account_user_time(struct task_struct *, cputime_t, cputime_t);
extern void account_system_time(struct task_struct *, int, cputime_t, cputime_t);
extern void account_steal_time(cputime_t);
extern void account_idle_time(cputime_t);

extern void account_process_tick(struct task_struct *, int user);
extern void account_steal_ticks(unsigned long ticks);
extern void account_idle_ticks(unsigned long ticks);

#ifdef CONFIG_VIRT_CPU_ACCOUNTING
extern void vtime_task_switch(struct task_struct *prev);
extern void vtime_account_system(struct task_struct *tsk);
extern void vtime_account_idle(struct task_struct *tsk);
#else
static inline void vtime_task_switch(struct task_struct *prev) { }
#endif

#endif /* _LINUX_KERNEL_STAT_H */