include/linux/vtime.h

   1 #ifndef _LINUX_KERNEL_VTIME_H
   2 #define _LINUX_KERNEL_VTIME_H
   3
   4 struct task_struct;
   5
   6 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
   7 extern void vtime_task_switch(struct task_struct *prev);
   8 extern void vtime_account_system(struct task_struct *tsk);
   9 extern void vtime_account_system_irqsafe(struct task_struct *tsk);
  10 extern void vtime_account_idle(struct task_struct *tsk);
  11 extern void vtime_account_user(struct task_struct *tsk);
  12 extern void vtime_account(struct task_struct *tsk);
  13 #else
  14 static inline void vtime_task_switch(struct task_struct *prev) { }
  15 static inline void vtime_account_system(struct task_struct *tsk) { }
  16 static inline void vtime_account_system_irqsafe(struct task_struct *tsk) { }
  17 static inline void vtime_account(struct task_struct *tsk) { }
  18 #endif
  19
  20 #ifdef CONFIG_IRQ_TIME_ACCOUNTING
  21 extern void irqtime_account_irq(struct task_struct *tsk);
  22 #else
  23 static inline void irqtime_account_irq(struct task_struct *tsk) { }
  24 #endif
  25
  26 static 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
  41 static 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 */