#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
gtod_log_caller(caller);
#endif
- if (!clock_gettime_works) {
+ if (fio_tv) {
+ memcpy(tp, fio_tv, sizeof(*tp));
+ return;
+ } else if (!clock_gettime_works) {
gtod:
gettimeofday(tp, NULL);
} else {
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);
}