printk and kernel log

Valdis.Kletnieks at Valdis.Kletnieks at
Tue Jun 25 11:07:07 EDT 2013

On Tue, 25 Jun 2013 12:04:08 +0300, Kevin Wilson said:
> Hi,
> You are right, thanks!
> disabling CONFIG_PRINTK_TIME prevented this timestamps.
> I believe they should have provide some sysfs entry for this, sorry
> they did not do so

Well actually, there's a boot-time cmdline parameter:

        printk.time=    Show timing data prefixed to each printk message line
                        Format: <bool>  (1/Y/y=enable, 0/N/n=disable)

And since the code that handles it treats it as a module parameter (even though
it's always builtin), you get this for free:

% ls -l /sys/module/printk/parameters
total 0
-rw-r--r--. 1 root root 4096 Jun 25 11:05 always_kmsg_dump
-rw-r--r--. 1 root root 4096 Jun 25 11:05 console_suspend
-rw-r--r--. 1 root root 4096 Jun 25 11:05 ignore_loglevel
-rw-r--r--. 1 root root 4096 Jun 25 11:05 time

So save yourselves the embarassment of submitting a patch to add it. ;)

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