linux/include/linux/vtime.h
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   1#ifndef _LINUX_KERNEL_VTIME_H
   2#define _LINUX_KERNEL_VTIME_H
   3
   4struct task_struct;
   5
   6#ifdef CONFIG_VIRT_CPU_ACCOUNTING
   7extern void vtime_task_switch(struct task_struct *prev);
   8extern void vtime_account_system(struct task_struct *tsk);
   9extern void vtime_account_system_irqsafe(struct task_struct *tsk);
  10extern void vtime_account_idle(struct task_struct *tsk);
  11extern void vtime_account_user(struct task_struct *tsk);
  12extern void vtime_account(struct task_struct *tsk);
  13#else
  14static inline void vtime_task_switch(struct task_struct *prev) { }
  15static inline void vtime_account_system(struct task_struct *tsk) { }
  16static inline void vtime_account_system_irqsafe(struct task_struct *tsk) { }
  17static inline void vtime_account(struct task_struct *tsk) { }
  18#endif
  19
  20#ifdef CONFIG_IRQ_TIME_ACCOUNTING
  21extern void irqtime_account_irq(struct task_struct *tsk);
  22#else
  23static inline void irqtime_account_irq(struct task_struct *tsk) { }
  24#endif
  25
  26static inline void vtime_account_irq_enter(struct task_struct *tsk)
  27{
  28        /*
  29         * Hardirq can interrupt idle task anytime. So we need vtime_account()
  30         * that performs the idle check in CONFIG_VIRT_CPU_ACCOUNTING.
  31         * Softirq can also interrupt idle task directly if it calls
  32         * local_bh_enable(). Such case probably don't exist but we never know.
  33         * Ksoftirqd is not concerned because idle time is flushed on context
  34         * switch. Softirqs in the end of hardirqs are also not a problem because
  35         * the idle time is flushed on hardirq time already.
  36         */
  37        vtime_account(tsk);
  38        irqtime_account_irq(tsk);
  39}
  40
  41static inline void vtime_account_irq_exit(struct task_struct *tsk)
  42{
  43        /* On hard|softirq exit we always account to hard|softirq cputime */
  44        vtime_account_system(tsk);
  45        irqtime_account_irq(tsk);
  46}
  47
  48#endif /* _LINUX_KERNEL_VTIME_H */
  49
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