Commit 3b9c0410 authored Jun 25, 2006 by Jan Engelhardt Committed by Linus Torvalds Jun 25, 2006

[PATCH] printk time parameter



Currently, enabling/disabling printk timestamps is only possible through
reboot (bootparam) or recompile.  I normally do not run with timestamps
(since syslog handles that in a good manner), but for measuring small
kernel delays (e.g.  irq probing - see parport thread) I needed subsecond
precision, but then again, just for some minutes rather than all kernel
messages to come.  The following patch adds a module_param() with which the
timestamps can be en-/disabled in a live system through
/sys/modules/printk/parameters/printk_time.

Signed-off-by: Jan Engelhardt <jengelh@gmx.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

parent e5dcd90b

kernel/printk.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -24,6 +24,7 @@
		#include <linux/console.h>
		#include <linux/init.h>
		#include <linux/module.h>
		#include <linux/moduleparam.h>
		#include <linux/interrupt.h> /* For in_interrupt() */
		#include <linux/config.h>
		#include <linux/delay.h>
		@@ -439,6 +440,7 @@ static int printk_time = 1;
		#else
		static int printk_time = 0;
		#endif
		module_param(printk_time, int, S_IRUGO \| S_IWUSR);

		static int __init printk_time_setup(char *str)
		{

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