LXR linux/include/asm-generic/cputime

   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 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#define nsecs_to_cputime64(__nsecs)     \
  54        (__force cputime64_t)(__nsecs)
  55
  56
  57/*
  58 * Convert cputime <-> microseconds
  59 */
  60#define cputime_to_usecs(__ct)          \
  61        cputime_div(__ct, NSEC_PER_USEC)
  62#define usecs_to_cputime(__usecs)       \
  63        (__force cputime_t)((__usecs) * NSEC_PER_USEC)
  64#define usecs_to_cputime64(__usecs)     \
  65        (__force cputime64_t)((__usecs) * NSEC_PER_USEC)
  66
  67/*
  68 * Convert cputime <-> seconds
  69 */
  70#define cputime_to_secs(__ct)           \
  71        cputime_div(__ct, NSEC_PER_SEC)
  72#define secs_to_cputime(__secs)         \
  73        (__force cputime_t)((__secs) * NSEC_PER_SEC)
  74
  75/*
  76 * Convert cputime <-> timespec (nsec)
  77 */
  78static inline cputime_t timespec_to_cputime(const struct timespec *val)
  79{
  80        u64 ret = (u64)val->tv_sec * NSEC_PER_SEC + val->tv_nsec;
  81        return (__force cputime_t) ret;
  82}
  83static inline void cputime_to_timespec(const cputime_t ct, struct timespec *val)
  84{
  85        u32 rem;
  86
  87        val->tv_sec = cputime_div_rem(ct, NSEC_PER_SEC, &rem);
  88        val->tv_nsec = rem;
  89}
  90
  91/*
  92 * Convert cputime <-> timeval (msec)
  93 */
  94static inline cputime_t timeval_to_cputime(const struct timeval *val)
  95{
  96        u64 ret = (u64)val->tv_sec * NSEC_PER_SEC +
  97                        val->tv_usec * NSEC_PER_USEC;
  98        return (__force cputime_t) ret;
  99}
 100static inline void cputime_to_timeval(const cputime_t ct, struct timeval *val)
 101{
 102        u32 rem;
 103
 104        val->tv_sec = cputime_div_rem(ct, NSEC_PER_SEC, &rem);
 105        val->tv_usec = rem / NSEC_PER_USEC;
 106}
 107
 108/*
 109 * Convert cputime <-> clock (USER_HZ)
 110 */
 111#define cputime_to_clock_t(__ct)        \
 112        cputime_div(__ct, (NSEC_PER_SEC / USER_HZ))
 113#define clock_t_to_cputime(__x)         \
 114        (__force cputime_t)((__x) * (NSEC_PER_SEC / USER_HZ))
 115
 116/*
 117 * Convert cputime64 to clock.
 118 */
 119#define cputime64_to_clock_t(__ct)      \
 120        cputime_to_clock_t((__force cputime_t)__ct)
 121
 122#endif
 123