Messages in this thread Patch in this message | | | Date | Mon, 5 Jun 2006 12:18:39 +0200 (MEST) | From | Jan Engelhardt <> | Subject | [PATCH] printk time parameter |
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Hello list,
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>
diff --fast -Ndpru linux-2.6.17-rc5~/kernel/printk.c linux-2.6.17-rc5+/kernel/printk.c --- linux-2.6.17-rc5~/kernel/printk.c 2006-06-03 13:30:10.000000000 +0200 +++ linux-2.6.17-rc5+/kernel/printk.c 2006-06-05 11:49:11.655884000 +0200 @@ -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> @@ -436,6 +437,7 @@ 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) { #<<eof>>
Jan Engelhardt -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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