From: Jens Axboe <axboe@kernel.dk>
Date: Fri, 17 May 2013 19:52:08 +0000 (+0200)
Subject: flow: quiesce pending IO before sleep
X-Git-Tag: fio-2.1.1~23
X-Git-Url: https://git.kernel.dk/?p=fio.git;a=commitdiff_plain;h=cb44aa1f72811770d50e1ba5da3d96f2beb51025

flow: quiesce pending IO before sleep

Similar potential latency problem as was fixed for thinktime
in commit 002e7183 and for rated IO in commit c3a1b740.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/flow.c b/flow.c
index b7a2fb12..f9d868d8 100644
--- a/flow.c
+++ b/flow.c
@@ -23,8 +23,11 @@ int flow_threshold_exceeded(struct thread_data *td)
 
 	sign = td->o.flow > 0 ? 1 : -1;
 	if (sign * flow->flow_counter > td->o.flow_watermark) {
-		if (td->o.flow_sleep)
+		if (td->o.flow_sleep) {
+			io_u_quiesce(td);
 			usleep(td->o.flow_sleep);
+		}
+
 		return 1;
 	}