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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253/* SPDX-License-Identifier: GPL-2.0-only *//* * sched_clock.h: support for extending counters to full 64-bit ns counter */#ifndef LINUX_SCHED_CLOCK#define LINUX_SCHED_CLOCK
#include <linux/types.h>
#ifdef CONFIG_GENERIC_SCHED_CLOCK/** * struct clock_read_data - data required to read from sched_clock() * * @epoch_ns: sched_clock() value at last update * @epoch_cyc: Clock cycle value at last update. * @sched_clock_mask: Bitmask for two's complement subtraction of non 64bit * clocks. * @read_sched_clock: Current clock source (or dummy source when suspended). * @mult: Multiplier for scaled math conversion. * @shift: Shift value for scaled math conversion. * * Care must be taken when updating this structure; it is read by * some very hot code paths. It occupies <=40 bytes and, when combined * with the seqcount used to synchronize access, comfortably fits into * a 64 byte cache line. */struct clock_read_data { u64 epoch_ns; u64 epoch_cyc; u64 sched_clock_mask; u64 (*read_sched_clock)(void); u32 mult; u32 shift;};
extern struct clock_read_data *sched_clock_read_begin(unsigned int *seq);extern int sched_clock_read_retry(unsigned int seq);
extern void generic_sched_clock_init(void);
extern void sched_clock_register(u64 (*read)(void), int bits, unsigned long rate);#elsestatic inline void generic_sched_clock_init(void) { }
static inline void sched_clock_register(u64 (*read)(void), int bits, unsigned long rate){}#endif
#endif