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printk ratelimiting rewrite

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All ratelimit user use same jiffies and burst params, so some messages
(callbacks) will be lost.

For example:
a call printk_ratelimit(5 * HZ, 1)
b call printk_ratelimit(5 * HZ, 1) before the 5*HZ timeout of a, then b will
will be supressed.

- rewrite __ratelimit, and use a ratelimit_state as parameter.  Thanks for
  hints from andrew.

- Add WARN_ON_RATELIMIT, update rcupreempt.h

- remove __printk_ratelimit

- use __ratelimit in net_ratelimit

Signed-off-by: Dave Young <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: "Paul E. McKenney" <[email protected]>
Cc: Dave Young <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Dave Young 2008-07-25 01:45:58 -07:00 • committed by Linus Torvalds
commit 717115e1a5
10 changed files with 79 additions and 56 deletions
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17
kernel/printk.c
View file

@ -1308,6 +1308,8 @@ void tty_write_message(struct tty_struct *tty, char *msg)
}
#if defined CONFIG_PRINTK
DEFINE_RATELIMIT_STATE(printk_ratelimit_state, 5 * HZ, 10);
/*
* printk rate limiting, lifted from the networking subsystem.
*
@ -1315,22 +1317,9 @@ void tty_write_message(struct tty_struct *tty, char *msg)
* every printk_ratelimit_jiffies to make a denial-of-service
* attack impossible.
*/
int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst)
{
return __ratelimit(ratelimit_jiffies, ratelimit_burst);
}
EXPORT_SYMBOL(__printk_ratelimit);
/* minimum time in jiffies between messages */
int printk_ratelimit_jiffies = 5 * HZ;
/* number of messages we send before ratelimiting */
int printk_ratelimit_burst = 10;
int printk_ratelimit(void)
{
return __printk_ratelimit(printk_ratelimit_jiffies,
printk_ratelimit_burst);
return __ratelimit(&printk_ratelimit_state);
}
EXPORT_SYMBOL(printk_ratelimit);