From: Jens Axboe <jens.axboe@oracle.com>
Date: Mon, 8 Jan 2007 21:27:05 +0000 (+0100)
Subject: [PATCH] Fix busy-looping with aio engine and depth > 1
X-Git-Tag: fio-1.11~1
X-Git-Url: https://git.kernel.dk/?p=fio.git;a=commitdiff_plain;h=ccbb91cb902f5a1931681248735551815d12c653;hp=1188caf84ba7fb6c2b3955ad67f4bf087ede13fd

[PATCH] Fix busy-looping with aio engine and depth > 1

It's ok for io_getevents() to return 0, if min_nr is 0. Check
first if io_getevents() returns >= min_nr, if so then just break
and return.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---

diff --git a/engines/fio-engine-libaio.c b/engines/fio-engine-libaio.c
index 45e69e90..da43f18c 100644
--- a/engines/fio-engine-libaio.c
+++ b/engines/fio-engine-libaio.c
@@ -51,7 +51,9 @@ static int fio_libaio_getevents(struct thread_data *td, int min, int max,
 
 	do {
 		r = io_getevents(ld->aio_ctx, min, max, ld->aio_events, t);
-		if (r == -EAGAIN) {
+		if (r >= min)
+			break;
+		else if (r == -EAGAIN) {
 			usleep(100);
 			continue;
 		} else if (r == -EINTR)