Jens Axboe | 02bcaa8 | 2006-11-24 10:42:00 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * Memory helpers |
| 3 | */ |
| 4 | #include <unistd.h> |
| 5 | #include <sys/time.h> |
| 6 | |
| 7 | #include "fio.h" |
| 8 | #include "os.h" |
| 9 | |
| 10 | #include "hash.h" |
| 11 | |
| 12 | static int clock_gettime_works = 1; |
| 13 | |
| 14 | #ifdef FIO_DEBUG_TIME |
| 15 | |
| 16 | #define HASH_BITS 8 |
| 17 | #define HASH_SIZE (1 << HASH_BITS) |
| 18 | |
| 19 | static struct list_head hash[HASH_SIZE]; |
| 20 | static int gtod_inited; |
| 21 | |
| 22 | struct gtod_log { |
| 23 | struct list_head list; |
| 24 | void *caller; |
| 25 | unsigned long calls; |
| 26 | }; |
| 27 | |
| 28 | static 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 | |
| 43 | static 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 | |
| 62 | static 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 | |
| 71 | static 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 | |
| 91 | static 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 | |
| 103 | void fio_gettime(struct timeval *tp, void *caller) |
| 104 | { |
| 105 | #ifdef FIO_DEBUG_TIME |
| 106 | if (!caller) |
| 107 | caller = __builtin_return_address(0); |
| 108 | |
| 109 | gtod_log_caller(caller); |
| 110 | #else |
| 111 | caller = NULL; |
| 112 | #endif |
| 113 | repeat: |
| 114 | if (!clock_gettime_works) |
| 115 | gettimeofday(tp, NULL); |
| 116 | else { |
| 117 | struct timespec ts; |
| 118 | |
| 119 | if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0) { |
| 120 | clock_gettime_works = 0; |
| 121 | goto repeat; |
| 122 | } |
| 123 | |
| 124 | tp->tv_sec = ts.tv_sec; |
| 125 | tp->tv_usec = ts.tv_nsec / 1000; |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | static void fio_init check_clock(void) |
| 130 | { |
| 131 | struct timespec ts; |
| 132 | |
| 133 | if (clock_getres(CLOCK_MONOTONIC, &ts) < 0) |
| 134 | clock_gettime_works = 0; |
| 135 | } |