[Linux]Linux kernel log裏的時間單位

Linux kernel log時間單位

具體單位是秒 <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

由於kernel log是經過printk打出來的，只要分析該函數就能夠知道單位

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); ... }

可見"."以前是秒，以後是微秒，按小數點統一來看也就是秒爲單位