Release 4.13 lib/ratelimit.c

/*
 * ratelimit.c - Do something with rate limit.
 *
 * Isolated from kernel/printk.c by Dave Young <hidave.darkstar@gmail.com>
 *
 * 2008-05-01 rewrite the function and use a ratelimit_state data struct as
 * parameter. Now every user can use their own standalone ratelimit_state.
 *
 * This file is released under the GPLv2.
 */

#include <linux/ratelimit.h>
#include <linux/jiffies.h>
#include <linux/export.h>

/*
 * __ratelimit - rate limiting
 * @rs: ratelimit_state data
 * @func: name of calling function
 *
 * This enforces a rate limit: not more than @rs->burst callbacks
 * in every @rs->interval
 *
 * RETURNS:
 * 0 means callbacks will be suppressed.
 * 1 means go ahead and do it.
 */


int ___ratelimit(struct ratelimit_state *rs, const char *func)
{
	unsigned long flags;
	int ret;

	if (!rs->interval)
		return 1;

	/*
         * If we contend on this state's lock then almost
         * by definition we are too busy to print a message,
         * in addition to the one that will be printed by
         * the entity that is holding the lock already:
         */
	if (!raw_spin_trylock_irqsave(&rs->lock, flags))
		return 0;

	if (!rs->begin)
		rs->begin = jiffies;

	if (time_is_before_jiffies(rs->begin + rs->interval)) {
		if (rs->missed) {
			if (!(rs->flags & RATELIMIT_MSG_ON_RELEASE)) {
				pr_warn("%s: %d callbacks suppressed\n", func, rs->missed);
				rs->missed = 0;
			}
		}
		rs->begin   = jiffies;
		rs->printed = 0;
	}
	if (rs->burst && rs->burst > rs->printed) {
		rs->printed++;
		ret = 1;
	} else {
		rs->missed++;
		ret = 0;
	}
	raw_spin_unlock_irqrestore(&rs->lock, flags);

	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Dave Young
111
62.71%
2
22.22%
Ingo Molnar
31
17.51%
2
22.22%
Borislav Petkov
21
11.86%
1
11.11%
Christian Bornträger
7
3.95%
1
11.11%
Alexey Dobriyan
4
2.26%
1
11.11%
Thomas Gleixner
2
1.13%
1
11.11%
Yong Zhang
1
0.56%
1
11.11%
Total
177
100.00%
9
100.00%


EXPORT_SYMBOL(___ratelimit);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Dave Young
122
63.21%
2
16.67%
Ingo Molnar
33
17.10%
3
25.00%
Borislav Petkov
21
10.88%
1
8.33%
Christian Bornträger
8
4.15%
1
8.33%
Alexey Dobriyan
4
2.07%
1
8.33%
Yong Zhang
2
1.04%
2
16.67%
Thomas Gleixner
2
1.04%
1
8.33%
Paul Gortmaker
1
0.52%
1
8.33%
Total
193
100.00%
12
100.00%
Directory: lib

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