include/linux/vtime.h

   1 #ifndef _LINUX_KERNEL_VTIME_H
   2 #define _LINUX_KERNEL_VTIME_H
   3
   4 #include <linux/context_tracking_state.h>
   5 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
   6 #include <asm/vtime.h>
   7 #endif
   8
   9
  10 struct task_struct;
  11
  12 /*
  13  * vtime_accounting_cpu_enabled() definitions/declarations
  14  */
  15 #if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE)
  16 static inline bool vtime_accounting_cpu_enabled(void) { return true; }
  17 #elif defined(CONFIG_VIRT_CPU_ACCOUNTING_GEN)
  18 /*
  19  * Checks if vtime is enabled on some CPU. Cputime readers want to be careful
  20  * in that case and compute the tickless cputime.
  21  * For now vtime state is tied to context tracking. We might want to decouple
  22  * those later if necessary.
  23  */
  24 static inline bool vtime_accounting_enabled(void)
  25 {
  26         return context_tracking_is_enabled();
  27 }
  28
  29 static inline bool vtime_accounting_cpu_enabled(void)
  30 {
  31         if (vtime_accounting_enabled()) {
  32                 if (context_tracking_cpu_is_enabled())
  33                         return true;
  34         }
  35
  36         return false;
  37 }
  38 #else /* !CONFIG_VIRT_CPU_ACCOUNTING */
  39 static inline bool vtime_accounting_cpu_enabled(void) { return false; }
  40 #endif
  41
  42
  43 /*
  44  * Common vtime APIs
  45  */
  46 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
  47
  48 #ifdef __ARCH_HAS_VTIME_TASK_SWITCH
  49 extern void vtime_task_switch(struct task_struct *prev);
  50 #else
  51 extern void vtime_common_task_switch(struct task_struct *prev);
  52 static inline void vtime_task_switch(struct task_struct *prev)
  53 {
  54         if (vtime_accounting_cpu_enabled())
  55                 vtime_common_task_switch(prev);
  56 }
  57 #endif /* __ARCH_HAS_VTIME_TASK_SWITCH */
  58
  59 extern void vtime_account_system(struct task_struct *tsk);
  60 extern void vtime_account_idle(struct task_struct *tsk);
  61
  62 #else /* !CONFIG_VIRT_CPU_ACCOUNTING */
  63
  64 static inline void vtime_task_switch(struct task_struct *prev) { }
  65 static inline void vtime_account_system(struct task_struct *tsk) { }
  66 #endif /* !CONFIG_VIRT_CPU_ACCOUNTING */
  67
  68 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
  69 extern void arch_vtime_task_switch(struct task_struct *tsk);
  70 extern void vtime_user_enter(struct task_struct *tsk);
  71 extern void vtime_user_exit(struct task_struct *tsk);
  72 extern void vtime_guest_enter(struct task_struct *tsk);
  73 extern void vtime_guest_exit(struct task_struct *tsk);
  74 extern void vtime_init_idle(struct task_struct *tsk, int cpu);
  75 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_GEN  */
  76 static inline void vtime_user_enter(struct task_struct *tsk) { }
  77 static inline void vtime_user_exit(struct task_struct *tsk) { }
  78 static inline void vtime_guest_enter(struct task_struct *tsk) { }
  79 static inline void vtime_guest_exit(struct task_struct *tsk) { }
  80 static inline void vtime_init_idle(struct task_struct *tsk, int cpu) { }
  81 #endif
  82
  83 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
  84 extern void vtime_account_irq_enter(struct task_struct *tsk);
  85 static inline void vtime_account_irq_exit(struct task_struct *tsk)
  86 {
  87         /* On hard|softirq exit we always account to hard|softirq cputime */
  88         vtime_account_system(tsk);
  89 }
  90 extern void vtime_flush(struct task_struct *tsk);
  91 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
  92 static inline void vtime_account_irq_enter(struct task_struct *tsk) { }
  93 static inline void vtime_account_irq_exit(struct task_struct *tsk) { }
  94 static inline void vtime_flush(struct task_struct *tsk) { }
  95 #endif
  96
  97
  98 #ifdef CONFIG_IRQ_TIME_ACCOUNTING
  99 extern void irqtime_account_irq(struct task_struct *tsk);
 100 #else
 101 static inline void irqtime_account_irq(struct task_struct *tsk) { }
 102 #endif
 103
 104 static inline void account_irq_enter_time(struct task_struct *tsk)
 105 {
 106         vtime_account_irq_enter(tsk);
 107         irqtime_account_irq(tsk);
 108 }
 109
 110 static inline void account_irq_exit_time(struct task_struct *tsk)
 111 {
 112         vtime_account_irq_exit(tsk);
 113         irqtime_account_irq(tsk);
 114 }
 115
 116 #endif /* _LINUX_KERNEL_VTIME_H */