linux-kernel - [PATCH] cfq: fix IOPRIO_CLASS

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Message-ID: <20071104193221.GA12373@tv-sign.ru>
Date:	Sun, 4 Nov 2007 22:32:21 +0300
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <axboe@...nel.dk>
Cc:	Nick <gentuu@...il.com>, Randy Dunlap <randy.dunlap@...cle.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] cfq: fix IOPRIO_CLASS_IDLE accounting

(untested, needs an ack from maintainer)

Spotted by Nick <gentuu@...il.com>, hopefully can explain the second trace in
http://bugzilla.kernel.org/show_bug.cgi?id=9180.

If ->async_idle_cfqq != NULL cfq_put_async_queues() puts it IOPRIO_BE_NR times
in a loop. Fix this.

Signed-off-by: Oleg Nesterov <oleg@...sign.ru>

--- cfq/block/cfq-iosched.c~	2007-08-09 19:59:26.000000000 +0400
+++ cfq/block/cfq-iosched.c	2007-11-04 22:23:42.000000000 +0300
@@ -2065,9 +2065,10 @@ static void cfq_put_async_queues(struct 
 			cfq_put_queue(cfqd->async_cfqq[0][i]);
 		if (cfqd->async_cfqq[1][i])
 			cfq_put_queue(cfqd->async_cfqq[1][i]);
-		if (cfqd->async_idle_cfqq)
-			cfq_put_queue(cfqd->async_idle_cfqq);
 	}
+
+	if (cfqd->async_idle_cfqq)
+		cfq_put_queue(cfqd->async_idle_cfqq);
 }
 
 static void cfq_exit_queue(elevator_t *e)

-
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