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Linux/include/asm-generic/cputime_nsecs.h

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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 
 21 typedef u64 __nocast cputime_t;
 22 typedef u64 __nocast cputime64_t;
 23 
 24 #define cmpxchg_cputime(ptr, old, new) cmpxchg64(ptr, old, new)
 25 
 26 #define cputime_one_jiffy               jiffies_to_cputime(1)
 27 
 28 #define cputime_div(__ct, divisor)  div_u64((__force u64)__ct, divisor)
 29 #define cputime_div_rem(__ct, divisor, remainder) \
 30         div_u64_rem((__force u64)__ct, divisor, remainder);
 31 
 32 /*
 33  * Convert cputime <-> jiffies (HZ)
 34  */
 35 #define cputime_to_jiffies(__ct)        \
 36         cputime_div(__ct, NSEC_PER_SEC / HZ)
 37 #define cputime_to_scaled(__ct)         (__ct)
 38 #define jiffies_to_cputime(__jif)       \
 39         (__force cputime_t)((__jif) * (NSEC_PER_SEC / HZ))
 40 #define cputime64_to_jiffies64(__ct)    \
 41         cputime_div(__ct, NSEC_PER_SEC / HZ)
 42 #define jiffies64_to_cputime64(__jif)   \
 43         (__force cputime64_t)((__jif) * (NSEC_PER_SEC / HZ))
 44 
 45 
 46 /*
 47  * Convert cputime <-> nanoseconds
 48  */
 49 #define cputime_to_nsecs(__ct)          \
 50         (__force u64)(__ct)
 51 #define nsecs_to_cputime(__nsecs)       \
 52         (__force cputime_t)(__nsecs)
 53 
 54 
 55 /*
 56  * Convert cputime <-> microseconds
 57  */
 58 #define cputime_to_usecs(__ct)          \
 59         cputime_div(__ct, NSEC_PER_USEC)
 60 #define usecs_to_cputime(__usecs)       \
 61         (__force cputime_t)((__usecs) * NSEC_PER_USEC)
 62 #define usecs_to_cputime64(__usecs)     \
 63         (__force cputime64_t)((__usecs) * NSEC_PER_USEC)
 64 
 65 /*
 66  * Convert cputime <-> seconds
 67  */
 68 #define cputime_to_secs(__ct)           \
 69         cputime_div(__ct, NSEC_PER_SEC)
 70 #define secs_to_cputime(__secs)         \
 71         (__force cputime_t)((__secs) * NSEC_PER_SEC)
 72 
 73 /*
 74  * Convert cputime <-> timespec (nsec)
 75  */
 76 static inline cputime_t timespec_to_cputime(const struct timespec *val)
 77 {
 78         u64 ret = (u64)val->tv_sec * NSEC_PER_SEC + val->tv_nsec;
 79         return (__force cputime_t) ret;
 80 }
 81 static inline void cputime_to_timespec(const cputime_t ct, struct timespec *val)
 82 {
 83         u32 rem;
 84 
 85         val->tv_sec = cputime_div_rem(ct, NSEC_PER_SEC, &rem);
 86         val->tv_nsec = rem;
 87 }
 88 
 89 /*
 90  * Convert cputime <-> timeval (msec)
 91  */
 92 static inline cputime_t timeval_to_cputime(const struct timeval *val)
 93 {
 94         u64 ret = (u64)val->tv_sec * NSEC_PER_SEC +
 95                         val->tv_usec * NSEC_PER_USEC;
 96         return (__force cputime_t) ret;
 97 }
 98 static inline void cputime_to_timeval(const cputime_t ct, struct timeval *val)
 99 {
100         u32 rem;
101 
102         val->tv_sec = cputime_div_rem(ct, NSEC_PER_SEC, &rem);
103         val->tv_usec = rem / NSEC_PER_USEC;
104 }
105 
106 /*
107  * Convert cputime <-> clock (USER_HZ)
108  */
109 #define cputime_to_clock_t(__ct)        \
110         cputime_div(__ct, (NSEC_PER_SEC / USER_HZ))
111 #define clock_t_to_cputime(__x)         \
112         (__force cputime_t)((__x) * (NSEC_PER_SEC / USER_HZ))
113 
114 /*
115  * Convert cputime64 to clock.
116  */
117 #define cputime64_to_clock_t(__ct)      \
118         cputime_to_clock_t((__force cputime_t)__ct)
119 
120 #endif
121 

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