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authorDave Young <hidave.darkstar@gmail.com>2008-07-25 01:45:58 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 10:53:29 -0700
commit717115e1a5856b57af0f71e1df7149108294fc10 (patch)
tree9528a992245c2fb993a0cf0bc8221dc7dea5d259 /include/linux/ratelimit.h
parent2711b793eb62a5873a0ba583a69252040aef176e (diff)
printk ratelimiting rewrite
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 <hidave.darkstar@gmail.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: "Paul E. McKenney" <paulmck@us.ibm.com> Cc: Dave Young <hidave.darkstar@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/ratelimit.h')
-rw-r--r--include/linux/ratelimit.h27
1 files changed, 27 insertions, 0 deletions
diff --git a/include/linux/ratelimit.h b/include/linux/ratelimit.h
new file mode 100644
index 000000000000..18a5b9ba9d40
--- /dev/null
+++ b/include/linux/ratelimit.h
@@ -0,0 +1,27 @@
+#ifndef _LINUX_RATELIMIT_H
+#define _LINUX_RATELIMIT_H
+#include <linux/param.h>
+
+#define DEFAULT_RATELIMIT_INTERVAL (5 * HZ)
+#define DEFAULT_RATELIMIT_BURST 10
+
+struct ratelimit_state {
+ int interval;
+ int burst;
+ int printed;
+ int missed;
+ unsigned long begin;
+};
+
+#define DEFINE_RATELIMIT_STATE(name, interval, burst) \
+ struct ratelimit_state name = {interval, burst,}
+
+extern int __ratelimit(struct ratelimit_state *rs);
+
+static inline int ratelimit(void)
+{
+ static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL,
+ DEFAULT_RATELIMIT_BURST);
+ return __ratelimit(&rs);
+}
+#endif