[Linux]Linux kernel log里的时间单位

Linux kernel log时间单位

具体单位是秒
<6>[ 0.588079] io scheduler noop registered

<6>[ 0.588151] io scheduler deadline registered

<6>[ 0.588291] io scheduler row registered

<6>[ 0.588549] io scheduler cfq registered (default)

<6>[ 0.588623] io scheduler test-iosched registered

因为kernel log是通过printk打出来的，只要分析该函数就可以知道单位

printk()
vprintk()
{
...
t = cpu_clock(printk_cpu);
nanosec_rem = do_div(t, 1000000000);
tlen = sprintf(tbuf, "[%5lu.%06lu]%c",
(unsigned long) t,
nanosec_rem / 1000, state);
...
}

可见"."之前是秒，之后是微秒，按小数点统一来看也就是秒为单位