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authorOleg Nesterov <oleg@tv-sign.ru>2007-11-07 09:46:13 +0100
committerJens Axboe <jens.axboe@oracle.com>2007-11-07 09:46:13 +0100
commitb70c864d3ce706571d2f3cac1d35d4fba01d6072 (patch)
treefbdab2c4ddf484e5344b8cc00e4bc24b6e443191 /block/cfq-iosched.c
parent2389d1ef172fc9df01f58265a436919d233fbc27 (diff)
downloadconfigs-b70c864d3ce706571d2f3cac1d35d4fba01d6072.tar.gz
cfq: fix IOPRIO_CLASS_IDLE delays
After the fresh boot: ionice -c3 -p $$ echo cfq >> /sys/block/XXX/queue/scheduler dd if=/dev/XXX of=/dev/null bs=512 count=1 Now dd hangs in D state and the queue is completely stalled for approximately INITIAL_JIFFIES + CFQ_IDLE_GRACE jiffies. This is because cfq_init_queue() forgets to initialize cfq_data->last_end_request. (I guess this patch is not complete, overflow is still possible) Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/cfq-iosched.c')
-rw-r--r--block/cfq-iosched.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 61a3f22eee2..6831a758d54 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -2126,6 +2126,7 @@ static void *cfq_init_queue(struct request_queue *q)
INIT_WORK(&cfqd->unplug_work, cfq_kick_queue);
+ cfqd->last_end_request = jiffies;
cfqd->cfq_quantum = cfq_quantum;
cfqd->cfq_fifo_expire[0] = cfq_fifo_expire[0];
cfqd->cfq_fifo_expire[1] = cfq_fifo_expire[1];