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