X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=time.c;h=6397f20e01dc8e2ce0cb0067311c155e9c7dce82;hp=d08c791673f55b8139be5ec20cc757a891913423;hb=4580885d413c7bca742dc2a373b9afcd5f48d7f8;hpb=6043c5790f9978814ec25e3ea8f4d574daf6266e

diff --git a/time.c b/time.c
index d08c7916..6397f20e 100644
--- a/time.c
+++ b/time.c
@@ -4,10 +4,12 @@
 #include "fio.h"
 
 static struct timeval genesis;
+static unsigned long ns_granularity;
 
-unsigned long utime_since(struct timeval *s, struct timeval *e)
+unsigned long long utime_since(struct timeval *s, struct timeval *e)
 {
-	double sec, usec;
+	long sec, usec;
+	unsigned long long ret;
 
 	sec = e->tv_sec - s->tv_sec;
 	usec = e->tv_usec - s->tv_usec;
@@ -16,22 +18,28 @@ unsigned long utime_since(struct timeval *s, struct timeval *e)
 		usec += 1000000;
 	}
 
-	sec *= (double) 1000000;
+	/*
+	 * time warp bug on some kernels?
+	 */
+	if (sec < 0 || (sec == 0 && usec < 0))
+		return 0;
 
-	return sec + usec;
+	ret = sec * 1000000ULL + usec;
+
+	return ret;
 }
 
-static unsigned long utime_since_now(struct timeval *s)
+unsigned long long utime_since_now(struct timeval *s)
 {
 	struct timeval t;
 
-	gettimeofday(&t, NULL);
+	fio_gettime(&t, NULL);
 	return utime_since(s, &t);
 }
 
 unsigned long mtime_since(struct timeval *s, struct timeval *e)
 {
-	double sec, usec;
+	long sec, usec, ret;
 
 	sec = e->tv_sec - s->tv_sec;
 	usec = e->tv_usec - s->tv_usec;
@@ -40,17 +48,25 @@ unsigned long mtime_since(struct timeval *s, struct timeval *e)
 		usec += 1000000;
 	}
 
-	sec *= (double) 1000;
-	usec /= (double) 1000;
+	sec *= 1000UL;
+	usec /= 1000UL;
+	ret = sec + usec;
+
+	/*
+	 * time warp bug on some kernels?
+	 */
+	if (ret < 0)
+		ret = 0;
 
-	return sec + usec;
+	return ret;
 }
 
 unsigned long mtime_since_now(struct timeval *s)
 {
 	struct timeval t;
+	void *p = __builtin_return_address(0);
 
-	gettimeofday(&t, NULL);
+	fio_gettime(&t, p);
 	return mtime_since(s, &t);
 }
 
@@ -62,75 +78,105 @@ unsigned long time_since_now(struct timeval *s)
 /*
  * busy looping version for the last few usec
  */
-void __usec_sleep(unsigned int usec)
+void usec_spin(unsigned int usec)
 {
 	struct timeval start;
 
-	gettimeofday(&start, NULL);
+	fio_gettime(&start, NULL);
 	while (utime_since_now(&start) < usec)
 		nop;
 }
 
 void usec_sleep(struct thread_data *td, unsigned long usec)
 {
-	struct timespec req, rem;
-
-	req.tv_sec = usec / 1000000;
-	req.tv_nsec = usec * 1000 - req.tv_sec * 1000000;
+	struct timespec req;
+	struct timeval tv;
 
 	do {
-		if (usec < 5000) {
-			__usec_sleep(usec);
+		unsigned long ts = usec;
+
+		if (usec < ns_granularity) {
+			usec_spin(usec);
 			break;
 		}
 
-		rem.tv_sec = rem.tv_nsec = 0;
-		if (nanosleep(&req, &rem) < 0)
-			break;
+		ts = usec - ns_granularity;
+
+		if (ts >= 1000000) {
+			req.tv_sec = ts / 1000000;
+			ts -= 1000000 * req.tv_sec;
+		} else
+			req.tv_sec = 0;
 
-		if ((rem.tv_sec + rem.tv_nsec) == 0)
+		req.tv_nsec = ts * 1000;
+		fio_gettime(&tv, NULL);
+
+		if (nanosleep(&req, NULL) < 0)
 			break;
 
-		req.tv_nsec = rem.tv_nsec;
-		req.tv_sec = rem.tv_sec;
+		ts = utime_since_now(&tv);
+		if (ts >= usec)
+			break;
 
-		usec = rem.tv_sec * 1000000 + rem.tv_nsec / 1000;
+		usec -= ts;
 	} while (!td->terminate);
 }
 
-void rate_throttle(struct thread_data *td, unsigned long time_spent,
-		   unsigned int bytes, int ddir)
+unsigned long mtime_since_genesis(void)
 {
-	unsigned long usec_cycle;
-
-	if (!td->rate)
-		return;
+	return mtime_since_now(&genesis);
+}
 
-	usec_cycle = td->rate_usec_cycle * (bytes / td->min_bs[ddir]);
+int in_ramp_time(struct thread_data *td)
+{
+	return td->o.ramp_time && !td->ramp_time_over;
+}
 
-	if (time_spent < usec_cycle) {
-		unsigned long s = usec_cycle - time_spent;
+int ramp_time_over(struct thread_data *td)
+{
+	struct timeval tv;
 
-		td->rate_pending_usleep += s;
-		if (td->rate_pending_usleep >= 100000) {
-			usec_sleep(td, td->rate_pending_usleep);
-			td->rate_pending_usleep = 0;
-		}
-	} else {
-		long overtime = time_spent - usec_cycle;
+	if (!td->o.ramp_time || td->ramp_time_over)
+		return 1;
 
-		td->rate_pending_usleep -= overtime;
+	fio_gettime(&tv, NULL);
+	if (mtime_since(&td->epoch, &tv) >= td->o.ramp_time * 1000) {
+		td->ramp_time_over = 1;
+		reset_all_stats(td);
+		td_set_runstate(td, TD_RAMP);
+		return 1;
 	}
+
+	return 0;
 }
 
-unsigned long mtime_since_genesis(void)
+static void fio_init time_init(void)
 {
-	return mtime_since_now(&genesis);
+	int i;
+
+	/*
+	 * Check the granularity of the nanosleep function
+	 */
+	for (i = 0; i < 10; i++) {
+		struct timeval tv;
+		struct timespec ts;
+		unsigned long elapsed;
+
+		fio_gettime(&tv, NULL);
+		ts.tv_sec = 0;
+		ts.tv_nsec = 1000;
+
+		nanosleep(&ts, NULL);
+		elapsed = utime_since_now(&tv);
+
+		if (elapsed > ns_granularity)
+			ns_granularity = elapsed;
+	}
 }
 
-void time_init(void)
+void set_genesis_time(void)
 {
-	gettimeofday(&genesis, NULL);
+	fio_gettime(&genesis, NULL);
 }
 
 void fill_start_time(struct timeval *t)