![Ingo Molnar](/assets/img/avatar_default.png)
The <linux/sched/clock.h> file is a largely self-contained header and users of it either don't need <linux/sched.h> - or have already included it. This reduces the size of the header dependency graph. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
105 lines
2.5 KiB
C
105 lines
2.5 KiB
C
#ifndef _LINUX_SCHED_CLOCK_H
|
|
#define _LINUX_SCHED_CLOCK_H
|
|
|
|
#include <linux/smp.h>
|
|
|
|
/*
|
|
* Do not use outside of architecture code which knows its limitations.
|
|
*
|
|
* sched_clock() has no promise of monotonicity or bounded drift between
|
|
* CPUs, use (which you should not) requires disabling IRQs.
|
|
*
|
|
* Please use one of the three interfaces below.
|
|
*/
|
|
extern unsigned long long notrace sched_clock(void);
|
|
|
|
/*
|
|
* See the comment in kernel/sched/clock.c
|
|
*/
|
|
extern u64 running_clock(void);
|
|
extern u64 sched_clock_cpu(int cpu);
|
|
|
|
|
|
extern void sched_clock_init(void);
|
|
|
|
#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
|
|
static inline void sched_clock_init_late(void)
|
|
{
|
|
}
|
|
|
|
static inline void sched_clock_tick(void)
|
|
{
|
|
}
|
|
|
|
static inline void clear_sched_clock_stable(void)
|
|
{
|
|
}
|
|
|
|
static inline void sched_clock_idle_sleep_event(void)
|
|
{
|
|
}
|
|
|
|
static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
|
|
{
|
|
}
|
|
|
|
static inline u64 cpu_clock(int cpu)
|
|
{
|
|
return sched_clock();
|
|
}
|
|
|
|
static inline u64 local_clock(void)
|
|
{
|
|
return sched_clock();
|
|
}
|
|
#else
|
|
extern void sched_clock_init_late(void);
|
|
/*
|
|
* Architectures can set this to 1 if they have specified
|
|
* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
|
|
* but then during bootup it turns out that sched_clock()
|
|
* is reliable after all:
|
|
*/
|
|
extern int sched_clock_stable(void);
|
|
extern void clear_sched_clock_stable(void);
|
|
|
|
extern void sched_clock_tick(void);
|
|
extern void sched_clock_idle_sleep_event(void);
|
|
extern void sched_clock_idle_wakeup_event(u64 delta_ns);
|
|
|
|
/*
|
|
* As outlined in clock.c, provides a fast, high resolution, nanosecond
|
|
* time source that is monotonic per cpu argument and has bounded drift
|
|
* between cpus.
|
|
*
|
|
* ######################### BIG FAT WARNING ##########################
|
|
* # when comparing cpu_clock(i) to cpu_clock(j) for i != j, time can #
|
|
* # go backwards !! #
|
|
* ####################################################################
|
|
*/
|
|
static inline u64 cpu_clock(int cpu)
|
|
{
|
|
return sched_clock_cpu(cpu);
|
|
}
|
|
|
|
static inline u64 local_clock(void)
|
|
{
|
|
return sched_clock_cpu(raw_smp_processor_id());
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_IRQ_TIME_ACCOUNTING
|
|
/*
|
|
* An i/f to runtime opt-in for irq time accounting based off of sched_clock.
|
|
* The reason for this explicit opt-in is not to have perf penalty with
|
|
* slow sched_clocks.
|
|
*/
|
|
extern void enable_sched_clock_irqtime(void);
|
|
extern void disable_sched_clock_irqtime(void);
|
|
#else
|
|
static inline void enable_sched_clock_irqtime(void) {}
|
|
static inline void disable_sched_clock_irqtime(void) {}
|
|
#endif
|
|
|
|
#endif /* _LINUX_SCHED_CLOCK_H */
|