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[fio.git] / gettime.c
CommitLineData
02bcaa8c 1/*
f5cc024a 2 * Clock functions
02bcaa8c 3 */
f5cc024a 4
02bcaa8c
JA
5#include <unistd.h>
6#include <sys/time.h>
7
8#include "fio.h"
02bcaa8c
JA
9
10#include "hash.h"
11
130fe616 12static int clock_gettime_works = 0;
02bcaa8c
JA
13
14#ifdef FIO_DEBUG_TIME
15
16#define HASH_BITS 8
17#define HASH_SIZE (1 << HASH_BITS)
18
19static struct list_head hash[HASH_SIZE];
20static int gtod_inited;
21
22struct gtod_log {
23 struct list_head list;
24 void *caller;
25 unsigned long calls;
26};
27
28static struct gtod_log *find_hash(void *caller)
29{
30 unsigned long h = hash_ptr(caller, HASH_BITS);
31 struct list_head *entry;
32
33 list_for_each(entry, &hash[h]) {
34 struct gtod_log *log = list_entry(entry, struct gtod_log, list);
35
36 if (log->caller == caller)
37 return log;
38 }
39
40 return NULL;
41}
42
43static struct gtod_log *find_log(void *caller)
44{
45 struct gtod_log *log = find_hash(caller);
46
47 if (!log) {
48 unsigned long h;
49
50 log = malloc(sizeof(*log));
51 INIT_LIST_HEAD(&log->list);
52 log->caller = caller;
53 log->calls = 0;
54
55 h = hash_ptr(caller, HASH_BITS);
56 list_add_tail(&log->list, &hash[h]);
57 }
58
59 return log;
60}
61
62static void gtod_log_caller(void *caller)
63{
64 if (gtod_inited) {
65 struct gtod_log *log = find_log(caller);
66
67 log->calls++;
68 }
69}
70
71static void fio_exit fio_dump_gtod(void)
72{
73 unsigned long total_calls = 0;
74 int i;
75
76 for (i = 0; i < HASH_SIZE; i++) {
77 struct list_head *entry;
78 struct gtod_log *log;
79
80 list_for_each(entry, &hash[i]) {
81 log = list_entry(entry, struct gtod_log, list);
82
83 printf("function %p, calls %lu\n", log->caller, log->calls);
84 total_calls += log->calls;
85 }
86 }
87
88 printf("Total %lu gettimeofday\n", total_calls);
89}
90
91static void fio_init gtod_init(void)
92{
93 int i;
94
95 for (i = 0; i < HASH_SIZE; i++)
96 INIT_LIST_HEAD(&hash[i]);
97
98 gtod_inited = 1;
99}
100
101#endif /* FIO_DEBUG_TIME */
102
1e97cce9 103#ifdef FIO_DEBUG_TIME
02bcaa8c 104void fio_gettime(struct timeval *tp, void *caller)
1e97cce9
JA
105#else
106void fio_gettime(struct timeval *tp, void fio_unused *caller)
107#endif
02bcaa8c
JA
108{
109#ifdef FIO_DEBUG_TIME
110 if (!caller)
111 caller = __builtin_return_address(0);
112
113 gtod_log_caller(caller);
02bcaa8c 114#endif
7e326f3b
JA
115 if (!clock_gettime_works) {
116gtod:
02bcaa8c 117 gettimeofday(tp, NULL);
7e326f3b 118 } else {
02bcaa8c
JA
119 struct timespec ts;
120
121 if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0) {
122 clock_gettime_works = 0;
7e326f3b 123 goto gtod;
02bcaa8c
JA
124 }
125
126 tp->tv_sec = ts.tv_sec;
127 tp->tv_usec = ts.tv_nsec / 1000;
128 }
129}