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printk: add printk_delay to make messages readable for some scenarios

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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>
This commit is contained in:
Dave Young
2009-09-22 16:43:33 -07:00
committed by Linus Torvalds
parent 3a3b6ed223
commit af91322ef3
4 changed files with 39 additions and 0 deletions
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include/linux/kernel.h
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@ -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):
*/