我在系统中执行了两个命令，在第一个命令中，我看到了操作系统支持的五种I / O调度；但是在第二个命令中，我只能切换三个选择。我有些困惑，您能告诉我如何在/ sys / block / vdb / queue / scheduler中将时间表切换为“截止日期”吗？
>dmesg|grep -i schedule
[ 1.099428] io scheduler noop registered
[ 1.100254] io scheduler deadline registered (default)
[ 1.101232] io scheduler cfq registered
[ 1.102042] io scheduler mq-deadline registered
[ 1.102918] io scheduler kyber registered
[862565.814586] nr_pdflush_threads exported in /proc is scheduled for removal
>cat /sys/block/vdb/queue/scheduler
[mq-deadline] kyber none