Revert "block: improve queue_should_plug() by looking at IO depths"
[linux-2.6.git] / include / linux / ratelimit.h
1 #ifndef _LINUX_RATELIMIT_H
2 #define _LINUX_RATELIMIT_H
3
4 #include <linux/param.h>
5 #include <linux/spinlock_types.h>
6
7 #define DEFAULT_RATELIMIT_INTERVAL      (5 * HZ)
8 #define DEFAULT_RATELIMIT_BURST         10
9
10 struct ratelimit_state {
11         spinlock_t      lock;           /* protect the state */
12
13         int             interval;
14         int             burst;
15         int             printed;
16         int             missed;
17         unsigned long   begin;
18 };
19
20 #define DEFINE_RATELIMIT_STATE(name, interval_init, burst_init)         \
21                                                                         \
22         struct ratelimit_state name = {                                 \
23                 .lock           = __SPIN_LOCK_UNLOCKED(name.lock),      \
24                 .interval       = interval_init,                        \
25                 .burst          = burst_init,                           \
26         }
27
28 extern int ___ratelimit(struct ratelimit_state *rs, const char *func);
29 #define __ratelimit(state) ___ratelimit(state, __func__)
30
31 #endif /* _LINUX_RATELIMIT_H */