int usecs; unsigned long my_s, my_us; rettime = ktime_get(); usecs64 = ktime_to_us(ktime_sub(rettime, starttime)); usecs = usecs64; my_s = usecs / USEC_PER_MSEC; my_us = usecs % USEC_PER_MSEC; if (usecs == 0) usecs = 1; printk("time: %ld.%03ld \r\n", my_s...
int usecs; unsigned long my_s, my_us; rettime = ktime_get(); usecs64 = ktime_to_us(ktime_sub(rettime, starttime)); usecs = usecs64; my_s = usecs / USEC_PER_MSEC; my_us = usecs % USEC_PER_MSEC; if (usecs == 0) usecs = 1; printk("time: %ld.%03ld \r\n", my_s...
ktime_get_coarse_ns等函数用于纳秒级时间获取。ktime_mono_to_real将单调时间转换为真实时间。ktime_get_ns等函数用于系统时间、真实时间等纳秒级获取。ktime_get_boottime_ts64和ktime_get_coarse_boottime_ts64用于获取启动时间。ktime_get_boottime_seconds获取秒级启动时间。ktime_get_clocktai_...
int usecs; unsigned long my_s, my_us; rettime = ktime_get(); usecs64 = ktime_to_us(ktime_sub(rettime, starttime)); usecs = usecs64; my_s = usecs / USEC_PER_MSEC; my_us = usecs % USEC_PER_MSEC; if (usecs == 0) usecs = 1; printk("time: %ld.%03ld \r\n", my_s...
ktime_t start = ktime_get(); ``` 接下来,我们可以使用ktime_to_ms()和ktime_to_us()函数将ktime_t值转换为毫秒或微秒。这两个函数分别接受一个ktime_t类型的参数,并返回相应的毫秒或微秒数。例如: ``` ktime_t start = ktime_get(); u64 start_ms = ktime_to_ms(start); ``` 此外,...
rt_weak rt_err_t rt_ktime_boottime_get_us(struct timeval *tv) { RT_ASSERT(tv != RT_NULL); unsigned long ns = (rt_ktime_cputimer_getcnt() * rt_ktime_cputimer_getres()) / RT_KTIME_RESMUL; rt_uint64_t ns = (rt_ktime_cputimer_getcnt() * rt_ktime_cputimer_getres()...
static inline ktime_t ktime_sub_us(const ktime_t kt, const u64 usec) { return ktime_sub_ns(kt, usec * 1000); @@ -366,7 +371,15 @@ extern void ktime_get_ts(struct timespec *ts); static inline ktime_t ns_to_ktime(u64 ns) { static const ktime_t ktime_zero = { .tv...
ktime_to_us函数和ktime_to_ms函数的作用是将ktime_t类型的时间值转换为微秒和毫秒单位的时间值。实际上就是将给定的ktime_t类型变量kt分别与NSEC_PER_USEC和NSEC_PER_MSEC,用ktime_divns函数得到相除结果。 //169~177行staticinlines64ktime_us_delta(constktime_tlater,constktime_tearlier){returnktime...
*start = ktime_get(); } static int time_print(const char *name, ktime_t starttime) { ktime_t rettime; s64 usecs64; int usecs; unsigned long my_s, my_us; rettime = ktime_get(); usecs64 = ktime_to_us(ktime_sub(rettime, starttime)); ...
lookup_user_key Look up a key ID given us by userspace with a given permissions mask to get* the key it refers to.* Flags can be passed to request that special keyrings be created if referred* to directly, to permit partially constructed keys to be found and to skip proc_keys_show ...