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>
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@ -154,6 +154,10 @@ enum {
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NULL_Q_MQ = 2,
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};
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static int g_no_sched;
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module_param_named(no_sched, g_no_sched, int, S_IRUGO);
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MODULE_PARM_DESC(no_sched, "No io scheduler");
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static int g_submit_queues = 1;
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module_param_named(submit_queues, g_submit_queues, int, S_IRUGO);
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MODULE_PARM_DESC(submit_queues, "Number of submission queues");
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@ -1754,6 +1758,8 @@ static int null_init_tag_set(struct nullb *nullb, struct blk_mq_tag_set *set)
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set->numa_node = nullb ? nullb->dev->home_node : g_home_node;
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set->cmd_size = sizeof(struct nullb_cmd);
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set->flags = BLK_MQ_F_SHOULD_MERGE;
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if (g_no_sched)
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set->flags |= BLK_MQ_F_NO_SCHED;
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set->driver_data = NULL;
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if ((nullb && nullb->dev->blocking) || g_blocking)
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