/* SPDX-License-Identifier: GPL-2.0 */ #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_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(void) { } static inline u64 cpu_clock(int cpu) { return sched_clock(); } static inline u64 local_clock(void) { return sched_clock(); } #else extern int sched_clock_stable(void); extern void clear_sched_clock_stable(void); /* * When sched_clock_stable(), __sched_clock_offset provides the offset * between local_clock() and sched_clock(). */ extern u64 __sched_clock_offset; extern void sched_clock_tick(void); extern void sched_clock_tick_stable(void); extern void sched_clock_idle_sleep_event(void); extern void sched_clock_idle_wakeup_event(void); /* * 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 */
Name | Type | Size | Permission | Actions |
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autogroup.h | File | 1.2 KB | 0644 |
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clock.h | File | 2.45 KB | 0644 |
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coredump.h | File | 2.75 KB | 0644 |
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cpufreq.h | File | 887 B | 0644 |
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cputime.h | File | 5.13 KB | 0644 |
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deadline.h | File | 597 B | 0644 |
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debug.h | File | 1.41 KB | 0644 |
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hotplug.h | File | 578 B | 0644 |
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idle.h | File | 1.77 KB | 0644 |
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init.h | File | 240 B | 0644 |
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isolation.h | File | 1.33 KB | 0644 |
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jobctl.h | File | 1.46 KB | 0644 |
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loadavg.h | File | 1.17 KB | 0644 |
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mm.h | File | 7.63 KB | 0644 |
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nohz.h | File | 1.22 KB | 0644 |
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numa_balancing.h | File | 1.26 KB | 0644 |
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prio.h | File | 1.71 KB | 0644 |
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rt.h | File | 1.41 KB | 0644 |
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signal.h | File | 17.79 KB | 0644 |
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smt.h | File | 415 B | 0644 |
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stat.h | File | 1.02 KB | 0644 |
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sysctl.h | File | 2.5 KB | 0644 |
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task.h | File | 3.9 KB | 0644 |
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task_stack.h | File | 3.03 KB | 0644 |
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topology.h | File | 6.18 KB | 0644 |
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user.h | File | 1.7 KB | 0644 |
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wake_q.h | File | 1.79 KB | 0644 |
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xacct.h | File | 854 B | 0644 |
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