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/*
* Clock functions
*/
#include <unistd.h>
#include <sys/time.h>
#include "fio.h"
#include "smalloc.h"
#include "hash.h"
static int clock_gettime_works;
static struct timeval last_tv;
static int last_tv_valid;
static struct timeval *fio_tv;
int fio_gtod_offload = 0;
int fio_gtod_cpu = -1;
#ifdef FIO_DEBUG_TIME
#define HASH_BITS 8
#define HASH_SIZE (1 << HASH_BITS)
static struct flist_head hash[HASH_SIZE];
static int gtod_inited;
struct gtod_log {
struct flist_head list;
void *caller;
unsigned long calls;
};
static struct gtod_log *find_hash(void *caller)
{
unsigned long h = hash_ptr(caller, HASH_BITS);
struct flist_head *entry;
flist_for_each(entry, &hash[h]) {
struct gtod_log *log = flist_entry(entry, struct gtod_log,
list);
if (log->caller == caller)
return log;
}
return NULL;
}
static struct gtod_log *find_log(void *caller)
{
struct gtod_log *log = find_hash(caller);
if (!log) {
unsigned long h;
log = malloc(sizeof(*log));
INIT_FLIST_HEAD(&log->list);
log->caller = caller;
log->calls = 0;
h = hash_ptr(caller, HASH_BITS);
flist_add_tail(&log->list, &hash[h]);
}
return log;
}
static void gtod_log_caller(void *caller)
{
if (gtod_inited) {
struct gtod_log *log = find_log(caller);
log->calls++;
}
}
static void fio_exit fio_dump_gtod(void)
{
unsigned long total_calls = 0;
int i;
for (i = 0; i < HASH_SIZE; i++) {
struct flist_head *entry;
struct gtod_log *log;
flist_for_each(entry, &hash[i]) {
log = flist_entry(entry, struct gtod_log, list);
printf("function %p, calls %lu\n", log->caller,
log->calls);
total_calls += log->calls;
}
}
printf("Total %lu gettimeofday\n", total_calls);
}
static void fio_init gtod_init(void)
{
int i;
for (i = 0; i < HASH_SIZE; i++)
INIT_FLIST_HEAD(&hash[i]);
gtod_inited = 1;
}
#endif /* FIO_DEBUG_TIME */
#ifdef FIO_DEBUG_TIME
void fio_gettime(struct timeval *tp, void *caller)
#else
void fio_gettime(struct timeval *tp, void fio_unused *caller)
#endif
{
#ifdef FIO_DEBUG_TIME
if (!caller)
caller = __builtin_return_address(0);
gtod_log_caller(caller);
#endif
if (fio_tv) {
memcpy(tp, fio_tv, sizeof(*tp));
return;
} else if (!clock_gettime_works) {
gtod:
gettimeofday(tp, NULL);
} else {
struct timespec ts;
if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0) {
clock_gettime_works = 0;
goto gtod;
}
tp->tv_sec = ts.tv_sec;
tp->tv_usec = ts.tv_nsec / 1000;
}
/*
* If Linux is using the tsc clock on non-synced processors,
* sometimes time can appear to drift backwards. Fix that up.
*/
if (last_tv_valid) {
if (tp->tv_sec < last_tv.tv_sec)
tp->tv_sec = last_tv.tv_sec;
else if (last_tv.tv_sec == tp->tv_sec &&
tp->tv_usec < last_tv.tv_usec)
tp->tv_usec = last_tv.tv_usec;
}
last_tv_valid = 1;
memcpy(&last_tv, tp, sizeof(*tp));
}
void fio_gtod_init(void)
{
fio_tv = smalloc(sizeof(struct timeval));
assert(fio_tv);
}
void fio_gtod_update(void)
{
gettimeofday(fio_tv, NULL);
}
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