diff --git a/gettime.c b/gettime.c
new file mode 100644
index 0000000..48aeb07
--- /dev/null
+++ b/gettime.c
@@ -0,0 +1,135 @@
+/*
+ * Memory helpers
+ */
+#include <unistd.h>
+#include <sys/time.h>
+
+#include "fio.h"
+#include "os.h"
+
+#include "hash.h"
+
+static int clock_gettime_works = 1;
+
+#ifdef FIO_DEBUG_TIME
+
+#define HASH_BITS	8
+#define HASH_SIZE	(1 << HASH_BITS)
+
+static struct list_head hash[HASH_SIZE];
+static int gtod_inited;
+
+struct gtod_log {
+	struct list_head list;
+	void *caller;
+	unsigned long calls;
+};
+
+static struct gtod_log *find_hash(void *caller)
+{
+	unsigned long h = hash_ptr(caller, HASH_BITS);
+	struct list_head *entry;
+
+	list_for_each(entry, &hash[h]) {
+		struct gtod_log *log = list_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_LIST_HEAD(&log->list);
+		log->caller = caller;
+		log->calls = 0;
+
+		h = hash_ptr(caller, HASH_BITS);
+		list_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 list_head *entry;
+		struct gtod_log *log;
+
+		list_for_each(entry, &hash[i]) {
+			log = list_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_LIST_HEAD(&hash[i]);
+
+	gtod_inited = 1;
+}
+
+#endif /* FIO_DEBUG_TIME */
+
+void fio_gettime(struct timeval *tp, void *caller)
+{
+#ifdef FIO_DEBUG_TIME
+	if (!caller)
+		caller = __builtin_return_address(0);
+
+	gtod_log_caller(caller);
+#else
+	caller = NULL;
+#endif
+repeat:
+	if (!clock_gettime_works)
+		gettimeofday(tp, NULL);
+	else {
+		struct timespec ts;
+
+		if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0) {
+			clock_gettime_works = 0;
+			goto repeat;
+		}
+
+		tp->tv_sec = ts.tv_sec;
+		tp->tv_usec = ts.tv_nsec / 1000;
+	}
+}
+
+static void fio_init check_clock(void)
+{
+	struct timespec ts;
+
+	if (clock_getres(CLOCK_MONOTONIC, &ts) < 0)
+		clock_gettime_works = 0;
+}