Fixup misuse of get_cpu_clock()

[fio.git] / time.c

diff --git a/time.c b/time.c
index 52462633a5fccc3791105aef65f64e708001c7f7..7015fd51b4bccf69dbf6d7c34b45569eda87a67f 100644 (file)
--- a/time.c
+++ b/time.c
@@ -3,9 +3,13 @@
 
 #include "fio.h"
 
-unsigned long utime_since(struct timeval *s, struct timeval *e)
+static struct timeval genesis;
+static unsigned long ns_granularity;
+
+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;
@@ -14,22 +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;
+
+       ret = sec * 1000000ULL + usec;
 
-       return sec + 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;
@@ -38,17 +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;
 
-       return sec + usec;
+       /*
+        * time warp bug on some kernels?
+        */
+       if (ret < 0)
+               ret = 0;
+
+       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);
 }
 
@@ -60,63 +78,110 @@ unsigned long time_since_now(struct timeval *s)
 /*
  * busy looping version for the last few usec
  */
-static 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;
+
+               req.tv_nsec = ts * 1000;
+               fio_gettime(&tv, NULL);
 
-               if ((rem.tv_sec + rem.tv_nsec) == 0)
+               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)
+unsigned long mtime_since_genesis(void)
 {
-       unsigned long usec_cycle;
+       return mtime_since_now(&genesis);
+}
 
-       if (!td->rate)
-               return;
+int in_ramp_time(struct thread_data *td)
+{
+       return td->o.ramp_time && !td->ramp_time_over;
+}
 
-       usec_cycle = td->rate_usec_cycle * (bytes / td->min_bs);
+int ramp_time_over(struct thread_data *td)
+{
+       struct timeval tv;
 
-       if (time_spent < usec_cycle) {
-               unsigned long s = usec_cycle - time_spent;
+       if (!td->o.ramp_time || td->ramp_time_over)
+               return 1;
 
-               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;
+       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;
+       }
 
-               td->rate_pending_usleep -= overtime;
+       return 0;
+}
+
+void fio_init fio_time_init(void)
+{
+       int i;
+
+       fio_clock_init();
+
+       /*
+        * 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 set_genesis_time(void)
+{
+       fio_gettime(&genesis, NULL);
+}
+
+void fill_start_time(struct timeval *t)
+{
+       memcpy(t, &genesis, sizeof(genesis));
+}