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 extern void vtime_account_user(struct task_struct *tsk);
  62
  63 #else /* !CONFIG_VIRT_CPU_ACCOUNTING */
  64
  65 static inline void vtime_task_switch(struct task_struct *prev) { }
  66 static inline void vtime_account_system(struct task_struct *tsk) { }
  67 static inline void vtime_account_user(struct task_struct *tsk) { }
  68 #endif /* !CONFIG_VIRT_CPU_ACCOUNTING */
  69
  70 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
  71 extern void arch_vtime_task_switch(struct task_struct *tsk);
  72 extern void vtime_user_enter(struct task_struct *tsk);
  73
  74 static inline void vtime_user_exit(struct task_struct *tsk)
  75 {
  76         vtime_account_user(tsk);
  77 }
  78 extern void vtime_guest_enter(struct task_struct *tsk);
  79 extern void vtime_guest_exit(struct task_struct *tsk);
  80 extern void vtime_init_idle(struct task_struct *tsk, int cpu);
  81 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_GEN  */
  82 static inline void vtime_user_enter(struct task_struct *tsk) { }
  83 static inline void vtime_user_exit(struct task_struct *tsk) { }
  84 static inline void vtime_guest_enter(struct task_struct *tsk) { }
  85 static inline void vtime_guest_exit(struct task_struct *tsk) { }
  86 static inline void vtime_init_idle(struct task_struct *tsk, int cpu) { }
  87 #endif
  88
  89 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
  90 extern void vtime_account_irq_enter(struct task_struct *tsk);
  91 static inline void vtime_account_irq_exit(struct task_struct *tsk)
  92 {
  93         /* On hard|softirq exit we always account to hard|softirq cputime */
  94         vtime_account_system(tsk);
  95 }
  96 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
  97 static inline void vtime_account_irq_enter(struct task_struct *tsk) { }
  98 static inline void vtime_account_irq_exit(struct task_struct *tsk) { }
  99 #endif
 100
 101
 102 #ifdef CONFIG_IRQ_TIME_ACCOUNTING
 103 extern void irqtime_account_irq(struct task_struct *tsk);
 104 #else
 105 static inline void irqtime_account_irq(struct task_struct *tsk) { }
 106 #endif
 107
 108 static inline void account_irq_enter_time(struct task_struct *tsk)
 109 {
 110         vtime_account_irq_enter(tsk);
 111         irqtime_account_irq(tsk);
 112 }
 113
 114 static inline void account_irq_exit_time(struct task_struct *tsk)
 115 {
 116         vtime_account_irq_exit(tsk);
 117         irqtime_account_irq(tsk);
 118 }
 119
 120 #endif /* _LINUX_KERNEL_VTIME_H */