aboutsummaryrefslogtreecommitdiff
path: root/include/linux/kernel.h
diff options
context:
space:
mode:
authorDave Young <hidave.darkstar@gmail.com>2009-09-22 16:43:33 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-23 07:39:28 -0700
commitaf91322ef3f29ae4114e736e2a72e28b4d619cf9 (patch)
treedebba08531c7dd78b90b5d8f2c03f6bf7c9e7877 /include/linux/kernel.h
parent3a3b6ed2235f2f619889dd6096e24b6d93bf3339 (diff)
printk: add printk_delay to make messages readable for some scenarios
When syslog is not possible, at the same time there's no serial/net console available, it will be hard to read the printk messages. For example oops/panic/warning messages in shutdown phase. Add a printk delay feature, we can make each printk message delay some milliseconds. Setting the delay by proc/sysctl interface: /proc/sys/kernel/printk_delay The value range from 0 - 10000, default value is 0 [akpm@linux-foundation.org: fix a few things] Signed-off-by: Dave Young <hidave.darkstar@gmail.com> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/kernel.h')
-rw-r--r--include/linux/kernel.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 2b5b1e0899a..0a2a1908786 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -246,6 +246,8 @@ extern int printk_ratelimit(void);
extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
unsigned int interval_msec);
+extern int printk_delay_msec;
+
/*
* Print a one-time message (analogous to WARN_ONCE() et al):
*/