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Linux kernel mirror (for testing)
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1/*
2 * Definitions for measuring cputime in nsecs resolution.
3 *
4 * Based on <arch/ia64/include/asm/cputime.h>
5 *
6 * Copyright (C) 2007 FUJITSU LIMITED
7 * Copyright (C) 2007 Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 *
14 */
15
16#ifndef _ASM_GENERIC_CPUTIME_NSECS_H
17#define _ASM_GENERIC_CPUTIME_NSECS_H
18
19#include <linux/math64.h>
20
21typedef u64 __nocast cputime_t;
22typedef u64 __nocast cputime64_t;
23
24#define cputime_one_jiffy jiffies_to_cputime(1)
25
26#define cputime_div(__ct, divisor) div_u64((__force u64)__ct, divisor)
27#define cputime_div_rem(__ct, divisor, remainder) \
28 div_u64_rem((__force u64)__ct, divisor, remainder);
29
30/*
31 * Convert cputime <-> jiffies (HZ)
32 */
33#define cputime_to_jiffies(__ct) \
34 cputime_div(__ct, NSEC_PER_SEC / HZ)
35#define cputime_to_scaled(__ct) (__ct)
36#define jiffies_to_cputime(__jif) \
37 (__force cputime_t)((__jif) * (NSEC_PER_SEC / HZ))
38#define cputime64_to_jiffies64(__ct) \
39 cputime_div(__ct, NSEC_PER_SEC / HZ)
40#define jiffies64_to_cputime64(__jif) \
41 (__force cputime64_t)((__jif) * (NSEC_PER_SEC / HZ))
42
43
44/*
45 * Convert cputime <-> nanoseconds
46 */
47#define nsecs_to_cputime(__nsecs) ((__force u64)(__nsecs))
48
49
50/*
51 * Convert cputime <-> microseconds
52 */
53#define cputime_to_usecs(__ct) \
54 cputime_div(__ct, NSEC_PER_USEC)
55#define usecs_to_cputime(__usecs) \
56 (__force cputime_t)((__usecs) * NSEC_PER_USEC)
57#define usecs_to_cputime64(__usecs) \
58 (__force cputime64_t)((__usecs) * NSEC_PER_USEC)
59
60/*
61 * Convert cputime <-> seconds
62 */
63#define cputime_to_secs(__ct) \
64 cputime_div(__ct, NSEC_PER_SEC)
65#define secs_to_cputime(__secs) \
66 (__force cputime_t)((__secs) * NSEC_PER_SEC)
67
68/*
69 * Convert cputime <-> timespec (nsec)
70 */
71static inline cputime_t timespec_to_cputime(const struct timespec *val)
72{
73 u64 ret = val->tv_sec * NSEC_PER_SEC + val->tv_nsec;
74 return (__force cputime_t) ret;
75}
76static inline void cputime_to_timespec(const cputime_t ct, struct timespec *val)
77{
78 u32 rem;
79
80 val->tv_sec = cputime_div_rem(ct, NSEC_PER_SEC, &rem);
81 val->tv_nsec = rem;
82}
83
84/*
85 * Convert cputime <-> timeval (msec)
86 */
87static inline cputime_t timeval_to_cputime(const struct timeval *val)
88{
89 u64 ret = val->tv_sec * NSEC_PER_SEC + val->tv_usec * NSEC_PER_USEC;
90 return (__force cputime_t) ret;
91}
92static inline void cputime_to_timeval(const cputime_t ct, struct timeval *val)
93{
94 u32 rem;
95
96 val->tv_sec = cputime_div_rem(ct, NSEC_PER_SEC, &rem);
97 val->tv_usec = rem / NSEC_PER_USEC;
98}
99
100/*
101 * Convert cputime <-> clock (USER_HZ)
102 */
103#define cputime_to_clock_t(__ct) \
104 cputime_div(__ct, (NSEC_PER_SEC / USER_HZ))
105#define clock_t_to_cputime(__x) \
106 (__force cputime_t)((__x) * (NSEC_PER_SEC / USER_HZ))
107
108/*
109 * Convert cputime64 to clock.
110 */
111#define cputime64_to_clock_t(__ct) \
112 cputime_to_clock_t((__force cputime_t)__ct)
113
114#endif