mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 06:34:11 +08:00
6b1d174b0c
Extend the ratelimiting facility to print the amount of suppressed lines when it is being released. This use case is aimed at short-termed, burst-like users for which we want to output the suppressed lines stats only once, after it has been disposed of. For an example, see /dev/kmsg usage in a follow-on patch. Also, change the printk() line we issue on release to not use "callbacks" as it is misleading: we're not suppressing callbacks but printk() calls. This has been separated from a previous patch by Linus. Link: http://lkml.kernel.org/r/20160716061745.15795-2-bp@alien8.de Signed-off-by: Borislav Petkov <bp@suse.de> Cc: Dave Young <dyoung@redhat.com> Cc: Franck Bui <fbui@suse.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
110 lines
2.5 KiB
C
110 lines
2.5 KiB
C
#ifndef _LINUX_RATELIMIT_H
|
|
#define _LINUX_RATELIMIT_H
|
|
|
|
#include <linux/param.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/spinlock.h>
|
|
|
|
#define DEFAULT_RATELIMIT_INTERVAL (5 * HZ)
|
|
#define DEFAULT_RATELIMIT_BURST 10
|
|
|
|
/* issue num suppressed message on exit */
|
|
#define RATELIMIT_MSG_ON_RELEASE BIT(0)
|
|
|
|
struct ratelimit_state {
|
|
raw_spinlock_t lock; /* protect the state */
|
|
|
|
int interval;
|
|
int burst;
|
|
int printed;
|
|
int missed;
|
|
unsigned long begin;
|
|
unsigned long flags;
|
|
};
|
|
|
|
#define RATELIMIT_STATE_INIT(name, interval_init, burst_init) { \
|
|
.lock = __RAW_SPIN_LOCK_UNLOCKED(name.lock), \
|
|
.interval = interval_init, \
|
|
.burst = burst_init, \
|
|
}
|
|
|
|
#define RATELIMIT_STATE_INIT_DISABLED \
|
|
RATELIMIT_STATE_INIT(ratelimit_state, 0, DEFAULT_RATELIMIT_BURST)
|
|
|
|
#define DEFINE_RATELIMIT_STATE(name, interval_init, burst_init) \
|
|
\
|
|
struct ratelimit_state name = \
|
|
RATELIMIT_STATE_INIT(name, interval_init, burst_init) \
|
|
|
|
static inline void ratelimit_state_init(struct ratelimit_state *rs,
|
|
int interval, int burst)
|
|
{
|
|
memset(rs, 0, sizeof(*rs));
|
|
|
|
raw_spin_lock_init(&rs->lock);
|
|
rs->interval = interval;
|
|
rs->burst = burst;
|
|
}
|
|
|
|
static inline void ratelimit_default_init(struct ratelimit_state *rs)
|
|
{
|
|
return ratelimit_state_init(rs, DEFAULT_RATELIMIT_INTERVAL,
|
|
DEFAULT_RATELIMIT_BURST);
|
|
}
|
|
|
|
static inline void ratelimit_state_exit(struct ratelimit_state *rs)
|
|
{
|
|
if (!(rs->flags & RATELIMIT_MSG_ON_RELEASE))
|
|
return;
|
|
|
|
if (rs->missed) {
|
|
pr_warn("%s: %d output lines suppressed due to ratelimiting\n",
|
|
current->comm, rs->missed);
|
|
rs->missed = 0;
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
ratelimit_set_flags(struct ratelimit_state *rs, unsigned long flags)
|
|
{
|
|
rs->flags = flags;
|
|
}
|
|
|
|
extern struct ratelimit_state printk_ratelimit_state;
|
|
|
|
extern int ___ratelimit(struct ratelimit_state *rs, const char *func);
|
|
#define __ratelimit(state) ___ratelimit(state, __func__)
|
|
|
|
#ifdef CONFIG_PRINTK
|
|
|
|
#define WARN_ON_RATELIMIT(condition, state) \
|
|
WARN_ON((condition) && __ratelimit(state))
|
|
|
|
#define WARN_RATELIMIT(condition, format, ...) \
|
|
({ \
|
|
static DEFINE_RATELIMIT_STATE(_rs, \
|
|
DEFAULT_RATELIMIT_INTERVAL, \
|
|
DEFAULT_RATELIMIT_BURST); \
|
|
int rtn = !!(condition); \
|
|
\
|
|
if (unlikely(rtn && __ratelimit(&_rs))) \
|
|
WARN(rtn, format, ##__VA_ARGS__); \
|
|
\
|
|
rtn; \
|
|
})
|
|
|
|
#else
|
|
|
|
#define WARN_ON_RATELIMIT(condition, state) \
|
|
WARN_ON(condition)
|
|
|
|
#define WARN_RATELIMIT(condition, format, ...) \
|
|
({ \
|
|
int rtn = WARN(condition, format, ##__VA_ARGS__); \
|
|
rtn; \
|
|
})
|
|
|
|
#endif
|
|
|
|
#endif /* _LINUX_RATELIMIT_H */
|