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 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
 115