On Tue, Nov 06 2007, Oleg Nesterov wrote:
> 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.
Another good catch, thanks Oleg!
> (I guess this patch is not complete, overflow is still possible)
Hmm, where would it overflow?
--
Jens Axboe
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