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| author | Oleg Nesterov <oleg@tv-sign.ru> | 2007-11-07 09:46:13 +0100 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2007-11-07 09:46:13 +0100 |
| commit | b70c864d3ce706571d2f3cac1d35d4fba01d6072 (patch) | |
| tree | fbdab2c4ddf484e5344b8cc00e4bc24b6e443191 /block/cfq-iosched.c | |
| parent | 2389d1ef172fc9df01f58265a436919d233fbc27 (diff) | |
| download | lwn-b70c864d3ce706571d2f3cac1d35d4fba01d6072.tar.gz lwn-b70c864d3ce706571d2f3cac1d35d4fba01d6072.zip | |
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.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index 61a3f22eee29..6831a758d541 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]; |