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Message-ID: <20080827170424.GA17217@tsunami.ccur.com>
Date: Wed, 27 Aug 2008 13:04:25 -0400
From: Joe Korty <joe.korty@...r.com>
To: Mark Brown <broonie@...ena.org.uk>
Cc: Ingo Molnar <mingo@...e.hu>,
Linux Kernel <linux-kernel@...r.kernel.org>,
Simon Farnsworth <simon.farnsworth@...lan.com>
Subject: [PATCH] printk timestamp post-boot suppression, v2
On Wed, Aug 27, 2008 at 12:16:30PM -0400, Mark Brown wrote:
> It'd be nicer if this were optional - syslog typically only logs at
> second resolution and not all systems are going to have logfiles.
Optionally suppress printk timestamping after system boot.
A new config option is introduced, which if selected
suppresses printk timestamping after the boot sequence
is completed.
Signed-off-by: Joe Korty <joe.korty@...r.com>
Index: 2.6.27-rc4-git4/kernel/printk.c
===================================================================
--- 2.6.27-rc4-git4.orig/kernel/printk.c 2008-08-27 09:37:52.000000000 -0400
+++ 2.6.27-rc4-git4/kernel/printk.c 2008-08-27 12:35:14.000000000 -0400
@@ -560,6 +560,12 @@
#endif
module_param_named(time, printk_time, bool, S_IRUGO | S_IWUSR);
+#if defined(CONFIG_PRINTK_TIME_BOOTONLY)
+#define printk_time_bootonly (system_state == SYSTEM_BOOTING)
+#else
+#define printk_time_bootonly (1)
+#endif
+
/* Check if we have any console registered that can be called early in boot. */
static int have_callable_console(void)
{
@@ -730,7 +736,7 @@
printed_len += 3;
new_text_line = 0;
- if (printk_time) {
+ if (printk_time && printk_time_bootonly) {
/* Follow the token with the time */
char tbuf[50], *tp;
unsigned tlen;
Index: 2.6.27-rc4-git4/lib/Kconfig.debug
===================================================================
--- 2.6.27-rc4-git4.orig/lib/Kconfig.debug 2008-08-26 16:28:41.000000000 -0400
+++ 2.6.27-rc4-git4/lib/Kconfig.debug 2008-08-27 12:29:34.000000000 -0400
@@ -9,6 +9,17 @@
operations. This is useful for identifying long delays
in kernel startup.
+config PRINTK_TIME_BOOTONLY
+ bool "Only show printk timing during kernel startup"
+ depends on PRINTK_TIME
+ help
+ If Y is selected, then timing information will
+ be prefixed to printk output lines only as long
+ as the kernel startup phase is in operation.
+
+ If N is selected, then every printk line will
+ be prefixed with timing information.
+
config ENABLE_WARN_DEPRECATED
bool "Enable __deprecated logic"
default y
--
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