X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=rate-submit.c;h=e5c6204351db00304db32fa376837faa9c420cc9;hb=b8b0e1eea7780a02ff67f0caeba446cc403f1b37;hp=68ad755d948056c0ff9fabc0a26a14961f410a05;hpb=8db390cd9131caec46d252dee39a2a511735283c;p=fio.git

diff --git a/rate-submit.c b/rate-submit.c
index 68ad755d..e5c62043 100644
--- a/rate-submit.c
+++ b/rate-submit.c
@@ -21,6 +21,14 @@ static void check_overlap(struct io_u *io_u)
 		 * time to prevent two threads from thinking the coast
 		 * is clear and then submitting IOs that overlap with
 		 * each other
+		 *
+		 * If an overlap is found, release the lock and
+		 * re-acquire it before checking again to give other
+		 * threads a chance to make progress
+		 *
+		 * If an overlap is not found, release the lock when the
+		 * io_u's IO_U_F_FLIGHT flag is set so that this io_u
+		 * can be checked by other threads as they assess overlap
 		 */
 		pthread_mutex_lock(&overlap_check);
 		for_each_td(td, i) {