Add support for normal/gaussian random distributions

[fio.git] / backend.c

diff --git a/backend.c b/backend.c
index fdb7413d7719ff9ff4b46af8e611c072c6918435..2be71496f1ddf3076e9bf36b19539168824b7b92 100644 (file)
--- a/backend.c
+++ b/backend.c
@@ -1526,6 +1526,15 @@ static void *thread_main(void *data)
 
                clear_state = 1;
 
+               /*
+                * Make sure we've successfully updated the rusage stats
+                * before waiting on the stat mutex. Otherwise we could have
+                * the stat thread holding stat mutex and waiting for
+                * the rusage_sem, which would never get upped because
+                * this thread is waiting for the stat mutex.
+                */
+               check_update_rusage(td);
+
                fio_mutex_down(stat_mutex);
                if (td_read(td) && td->io_bytes[DDIR_READ]) {
                        elapsed = mtime_since_now(&td->start);
@@ -1556,6 +1565,11 @@ static void *thread_main(void *data)
 
                do_verify(td, verify_bytes);
 
+               /*
+                * See comment further up for why this is done here.
+                */
+               check_update_rusage(td);
+
                fio_mutex_down(stat_mutex);
                td->ts.runtime[DDIR_READ] += mtime_since_now(&td->start);
                fio_gettime(&td->start, NULL);