numa: add -numa node,memdev= option
[qemu.git] / include / qemu / ratelimit.h
1 /*
2 * Ratelimiting calculations
3 *
4 * Copyright IBM, Corp. 2011
5 *
6 * Authors:
7 * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
8 *
9 * This work is licensed under the terms of the GNU LGPL, version 2 or later.
10 * See the COPYING.LIB file in the top-level directory.
11 *
12 */
13
14 #ifndef QEMU_RATELIMIT_H
15 #define QEMU_RATELIMIT_H 1
16
17 typedef struct {
18 int64_t next_slice_time;
19 uint64_t slice_quota;
20 uint64_t slice_ns;
21 uint64_t dispatched;
22 } RateLimit;
23
24 static inline int64_t ratelimit_calculate_delay(RateLimit *limit, uint64_t n)
25 {
26 int64_t now = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
27
28 if (limit->next_slice_time < now) {
29 limit->next_slice_time = now + limit->slice_ns;
30 limit->dispatched = 0;
31 }
32 if (limit->dispatched == 0 || limit->dispatched + n <= limit->slice_quota) {
33 limit->dispatched += n;
34 return 0;
35 } else {
36 limit->dispatched = n;
37 return limit->next_slice_time - now;
38 }
39 }
40
41 static inline void ratelimit_set_speed(RateLimit *limit, uint64_t speed,
42 uint64_t slice_ns)
43 {
44 limit->slice_ns = slice_ns;
45 limit->slice_quota = ((double)speed * slice_ns)/1000000000ULL;
46 }
47
48 #endif