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cputime.h
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1 /*
2  * Definitions for measuring cputime on powerpc machines.
3  *
4  * Copyright (C) 2006 Paul Mackerras, IBM Corp.
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; either version
9  * 2 of the License, or (at your option) any later version.
10  *
11  * If we have CONFIG_VIRT_CPU_ACCOUNTING, we measure cpu time in
12  * the same units as the timebase. Otherwise we measure cpu time
13  * in jiffies using the generic definitions.
14  */
15 
16 #ifndef __POWERPC_CPUTIME_H
17 #define __POWERPC_CPUTIME_H
18 
19 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
20 #include <asm-generic/cputime.h>
21 #ifdef __KERNEL__
22 static inline void setup_cputime_one_jiffy(void) { }
23 #endif
24 #else
25 
26 #include <linux/types.h>
27 #include <linux/time.h>
28 #include <asm/div64.h>
29 #include <asm/time.h>
30 #include <asm/param.h>
31 
32 typedef u64 __nocast cputime_t;
33 typedef u64 __nocast cputime64_t;
34 
35 #ifdef __KERNEL__
36 
37 /*
38  * One jiffy in timebase units computed during initialization
39  */
41 
42 /*
43  * Convert cputime <-> jiffies
44  */
45 extern u64 __cputime_jiffies_factor;
46 DECLARE_PER_CPU(unsigned long, cputime_last_delta);
47 DECLARE_PER_CPU(unsigned long, cputime_scaled_last_delta);
48 
49 static inline unsigned long cputime_to_jiffies(const cputime_t ct)
50 {
51  return mulhdu((__force u64) ct, __cputime_jiffies_factor);
52 }
53 
54 /* Estimate the scaled cputime by scaling the real cputime based on
55  * the last scaled to real ratio */
56 static inline cputime_t cputime_to_scaled(const cputime_t ct)
57 {
59  __get_cpu_var(cputime_last_delta))
60  return (__force u64) ct *
61  __get_cpu_var(cputime_scaled_last_delta) /
62  __get_cpu_var(cputime_last_delta);
63  return ct;
64 }
65 
66 static inline cputime_t jiffies_to_cputime(const unsigned long jif)
67 {
68  u64 ct;
69  unsigned long sec;
70 
71  /* have to be a little careful about overflow */
72  ct = jif % HZ;
73  sec = jif / HZ;
74  if (ct) {
75  ct *= tb_ticks_per_sec;
76  do_div(ct, HZ);
77  }
78  if (sec)
79  ct += (cputime_t) sec * tb_ticks_per_sec;
80  return (__force cputime_t) ct;
81 }
82 
83 static inline void setup_cputime_one_jiffy(void)
84 {
86 }
87 
88 static inline cputime64_t jiffies64_to_cputime64(const u64 jif)
89 {
90  u64 ct;
91  u64 sec;
92 
93  /* have to be a little careful about overflow */
94  ct = jif % HZ;
95  sec = jif / HZ;
96  if (ct) {
97  ct *= tb_ticks_per_sec;
98  do_div(ct, HZ);
99  }
100  if (sec)
101  ct += (u64) sec * tb_ticks_per_sec;
102  return (__force cputime64_t) ct;
103 }
104 
105 static inline u64 cputime64_to_jiffies64(const cputime_t ct)
106 {
107  return mulhdu((__force u64) ct, __cputime_jiffies_factor);
108 }
109 
110 /*
111  * Convert cputime <-> microseconds
112  */
113 extern u64 __cputime_usec_factor;
114 
115 static inline unsigned long cputime_to_usecs(const cputime_t ct)
116 {
117  return mulhdu((__force u64) ct, __cputime_usec_factor);
118 }
119 
120 static inline cputime_t usecs_to_cputime(const unsigned long us)
121 {
122  u64 ct;
123  unsigned long sec;
124 
125  /* have to be a little careful about overflow */
126  ct = us % 1000000;
127  sec = us / 1000000;
128  if (ct) {
129  ct *= tb_ticks_per_sec;
130  do_div(ct, 1000000);
131  }
132  if (sec)
133  ct += (cputime_t) sec * tb_ticks_per_sec;
134  return (__force cputime_t) ct;
135 }
136 
137 #define usecs_to_cputime64(us) usecs_to_cputime(us)
138 
139 /*
140  * Convert cputime <-> seconds
141  */
142 extern u64 __cputime_sec_factor;
143 
144 static inline unsigned long cputime_to_secs(const cputime_t ct)
145 {
146  return mulhdu((__force u64) ct, __cputime_sec_factor);
147 }
148 
149 static inline cputime_t secs_to_cputime(const unsigned long sec)
150 {
151  return (__force cputime_t)((u64) sec * tb_ticks_per_sec);
152 }
153 
154 /*
155  * Convert cputime <-> timespec
156  */
157 static inline void cputime_to_timespec(const cputime_t ct, struct timespec *p)
158 {
159  u64 x = (__force u64) ct;
160  unsigned int frac;
161 
162  frac = do_div(x, tb_ticks_per_sec);
163  p->tv_sec = x;
164  x = (u64) frac * 1000000000;
166  p->tv_nsec = x;
167 }
168 
169 static inline cputime_t timespec_to_cputime(const struct timespec *p)
170 {
171  u64 ct;
172 
173  ct = (u64) p->tv_nsec * tb_ticks_per_sec;
174  do_div(ct, 1000000000);
175  return (__force cputime_t)(ct + (u64) p->tv_sec * tb_ticks_per_sec);
176 }
177 
178 /*
179  * Convert cputime <-> timeval
180  */
181 static inline void cputime_to_timeval(const cputime_t ct, struct timeval *p)
182 {
183  u64 x = (__force u64) ct;
184  unsigned int frac;
185 
186  frac = do_div(x, tb_ticks_per_sec);
187  p->tv_sec = x;
188  x = (u64) frac * 1000000;
190  p->tv_usec = x;
191 }
192 
193 static inline cputime_t timeval_to_cputime(const struct timeval *p)
194 {
195  u64 ct;
196 
197  ct = (u64) p->tv_usec * tb_ticks_per_sec;
198  do_div(ct, 1000000);
199  return (__force cputime_t)(ct + (u64) p->tv_sec * tb_ticks_per_sec);
200 }
201 
202 /*
203  * Convert cputime <-> clock_t (units of 1/USER_HZ seconds)
204  */
205 extern u64 __cputime_clockt_factor;
206 
207 static inline unsigned long cputime_to_clock_t(const cputime_t ct)
208 {
209  return mulhdu((__force u64) ct, __cputime_clockt_factor);
210 }
211 
212 static inline cputime_t clock_t_to_cputime(const unsigned long clk)
213 {
214  u64 ct;
215  unsigned long sec;
216 
217  /* have to be a little careful about overflow */
218  ct = clk % USER_HZ;
219  sec = clk / USER_HZ;
220  if (ct) {
221  ct *= tb_ticks_per_sec;
222  do_div(ct, USER_HZ);
223  }
224  if (sec)
225  ct += (u64) sec * tb_ticks_per_sec;
226  return (__force cputime_t) ct;
227 }
228 
229 #define cputime64_to_clock_t(ct) cputime_to_clock_t((cputime_t)(ct))
230 
231 #endif /* __KERNEL__ */
232 #endif /* CONFIG_VIRT_CPU_ACCOUNTING */
233 #endif /* __POWERPC_CPUTIME_H */