CONFIG_PRINTK_TIME, printk, timestamp

출처 : http://lwn.net/Articles/497560/

printk: add relative printk timing support

This patch adds support for relative timestamps in printk output.

First, this is how it looks now:

[  120.001386] foo
[  181.036862] bar
[  186.070696] zoot
[  196.288022] foo
[  257.415895] bar
[  257.416580] zoot

Next, with Linus' suggestion (Month and date, no seconds):

[May 17 14:13] foo
[May 17 14:14] bar
[+05.00026906] zoot
[+10.00054898] foo
[May 17 14:15] bar
[+00.00000668] zoot

And Peter's suggestion (MS accurate absolute time):

[14:16:57.970] foo
[14:17:59.063] bar
[+05.00032139] zoot
[+10.00336079] foo
[14:19:15.677] bar
[+00.00001905] zoot