diff options
| author | weiping zhang <zhangweiping@didichuxing.com> | 2017-09-30 09:49:21 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2017-09-30 02:07:34 -0600 |
| commit | b3cffc3877a6c7edf17fd9c476f3e8d930bccec1 (patch) | |
| tree | 54a3debdad390ad78e390ab03e26f785e08146fc | |
| parent | 0b508bc926bdced678febee2a2b8cdba0a19e481 (diff) | |
null_blk: add "no_sched" module parameter
add an option that disable io scheduler for null block device.
Signed-off-by: weiping zhang <zhangweiping@didichuxing.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | drivers/block/null_blk.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c index 8042c26ea9e6..bf2c8ca3242a 100644 --- a/drivers/block/null_blk.c +++ b/drivers/block/null_blk.c @@ -154,6 +154,10 @@ enum { NULL_Q_MQ = 2, }; +static int g_no_sched; +module_param_named(no_sched, g_no_sched, int, S_IRUGO); +MODULE_PARM_DESC(no_sched, "No io scheduler"); + static int g_submit_queues = 1; module_param_named(submit_queues, g_submit_queues, int, S_IRUGO); MODULE_PARM_DESC(submit_queues, "Number of submission queues"); @@ -1754,6 +1758,8 @@ static int null_init_tag_set(struct nullb *nullb, struct blk_mq_tag_set *set) set->numa_node = nullb ? nullb->dev->home_node : g_home_node; set->cmd_size = sizeof(struct nullb_cmd); set->flags = BLK_MQ_F_SHOULD_MERGE; + if (g_no_sched) + set->flags |= BLK_MQ_F_NO_SCHED; set->driver_data = NULL; if ((nullb && nullb->dev->blocking) || g_blocking) |