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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
