From: Jens Axboe <jaxboe@fusionio.com>
Date: Thu, 7 Jul 2011 19:06:40 +0000 (+0200)
Subject: Ensure that we honor aio_read/write() returning EAGAIN
X-Git-Tag: fio-1.56~26
X-Git-Url: https://git.kernel.dk/?p=fio.git;a=commitdiff_plain;h=afa16407813ee36e75aaa665613c469500ed07c6

Ensure that we honor aio_read/write() returning EAGAIN

This fixes a problem on OSX, where the number of resources for
aio is woefully small.

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
---

diff --git a/engines/posixaio.c b/engines/posixaio.c
index 061812e6..867b5f72 100644
--- a/engines/posixaio.c
+++ b/engines/posixaio.c
@@ -184,6 +184,13 @@ static int fio_posixaio_queue(struct thread_data *td,
 	}
 		
 	if (ret) {
+		/*
+		 * At least OSX has a very low limit on the number of pending
+		 * IOs, so if it will return EAGAIN.
+		 */
+		if (errno == EAGAIN)
+			return FIO_Q_BUSY;
+
 		io_u->error = errno;
 		td_verror(td, io_u->error, "xfer");
 		return FIO_Q_COMPLETED;