Commit b3cffc38 authored by weiping zhang's avatar weiping zhang Committed by Jens Axboe
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null_blk: add "no_sched" module parameter 



add an option that disable io scheduler for null block device.

Signed-off-by: default avatarweiping zhang <zhangweiping@didichuxing.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 0b508bc9

drivers/block/null_blk.c

+6 −0
Original line number Diff line number Diff line
@@ -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)