include/linux/vtime.h

Source file repositories/reference/linux-study-clean/include/linux/vtime.h

File Facts

System
Linux kernel
Corpus path
include/linux/vtime.h
Extension
.h
Size
5219 bytes
Lines
180
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

static inline void vtime_user_enter(struct task_struct *tsk) { }
static inline void vtime_user_exit(struct task_struct *tsk) { }
static inline void vtime_guest_enter(struct task_struct *tsk) { }
static inline void vtime_guest_exit(struct task_struct *tsk) { }
static inline void vtime_init_idle(struct task_struct *tsk, int cpu) { }
#endif

static inline bool vtime_generic_enabled_cpu(int cpu)
{
	return context_tracking_enabled_cpu(cpu);
}

static inline bool vtime_generic_enabled_this_cpu(void)
{
	return context_tracking_enabled_this_cpu();
}

#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
extern void vtime_account_idle(struct task_struct *tsk);
extern void vtime_account_irq(struct task_struct *tsk, unsigned int offset);
extern void vtime_account_softirq(struct task_struct *tsk);
extern void vtime_account_hardirq(struct task_struct *tsk);
extern void vtime_flush(struct task_struct *tsk);
#ifdef CONFIG_HAVE_VIRT_CPU_ACCOUNTING_IDLE
static inline void vtime_reset(void) { }
static inline void vtime_dyntick_start(void) { }
static inline void vtime_dyntick_stop(void) { }
#else
extern void vtime_reset(void);
extern void vtime_dyntick_start(void);
extern void vtime_dyntick_stop(void);
#endif
#else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
static inline void vtime_account_irq(struct task_struct *tsk, unsigned int offset) { }
static inline void vtime_account_softirq(struct task_struct *tsk) { }
static inline void vtime_account_hardirq(struct task_struct *tsk) { }
static inline void vtime_flush(struct task_struct *tsk) { }
static inline void vtime_reset(void) { }
static inline void vtime_dyntick_start(void) { }
static inline void vtime_dyntick_stop(void) { }
#endif

/*
 * vtime_accounting_enabled_this_cpu() definitions/declarations
 */
#if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE)

static inline bool vtime_accounting_enabled_this_cpu(void) { return true; }
extern void vtime_task_switch(struct task_struct *prev);

static __always_inline void vtime_account_guest_enter(void)
{
	vtime_account_kernel(current);
	current->flags |= PF_VCPU;
}

static __always_inline void vtime_account_guest_exit(void)
{
	vtime_account_kernel(current);
	current->flags &= ~PF_VCPU;
}

#elif defined(CONFIG_VIRT_CPU_ACCOUNTING_GEN)

/*
 * Checks if vtime is enabled on some CPU. Cputime readers want to be careful
 * in that case and compute the tickless cputime.
 * For now vtime state is tied to context tracking. We might want to decouple
 * those later if necessary.
 */
static inline bool vtime_accounting_enabled(void)
{
	return context_tracking_enabled();
}

static inline bool vtime_accounting_enabled_cpu(int cpu)
{
	return vtime_generic_enabled_cpu(cpu);
}

static inline bool vtime_accounting_enabled_this_cpu(void)
{
	return vtime_generic_enabled_this_cpu();
}

extern void vtime_task_switch_generic(struct task_struct *prev);

static inline void vtime_task_switch(struct task_struct *prev)
{
	if (vtime_accounting_enabled_this_cpu())

Annotation

Implementation Notes