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Commit d19afebc authored by Ming Lei's avatar Ming Lei Committed by Jens Axboe
Browse files

blk-wbt: export internal state via debugfs 



This information is helpful to either investigate issues, or understand
wbt's internal behaviour.

Cc: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Omar Sandoval <osandov@fb.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: default avatarMing Lei <ming.lei@redhat.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent cc56694f

block/blk-wbt.c

+91 −0
Original line number Diff line number Diff line
@@ -715,6 +715,94 @@ void wbt_disable_default(struct request_queue *q) 
}

EXPORT_SYMBOL_GPL(wbt_disable_default);



#ifdef CONFIG_BLK_DEBUG_FS

static int wbt_curr_win_nsec_show(void *data, struct seq_file *m)

{

	struct rq_qos *rqos = data;

	struct rq_wb *rwb = RQWB(rqos);



	seq_printf(m, "%llu\n", rwb->cur_win_nsec);

	return 0;

}



static int wbt_enabled_show(void *data, struct seq_file *m)

{

	struct rq_qos *rqos = data;

	struct rq_wb *rwb = RQWB(rqos);



	seq_printf(m, "%d\n", rwb->enable_state);

	return 0;

}



static int wbt_id_show(void *data, struct seq_file *m)

{

	struct rq_qos *rqos = data;



	seq_printf(m, "%u\n", rqos->id);

	return 0;

}



static int wbt_inflight_show(void *data, struct seq_file *m)

{

	struct rq_qos *rqos = data;

	struct rq_wb *rwb = RQWB(rqos);

	int i;



	for (i = 0; i < WBT_NUM_RWQ; i++)

		seq_printf(m, "%d: inflight %d\n", i,

			   atomic_read(&rwb->rq_wait[i].inflight));

	return 0;

}



static int wbt_min_lat_nsec_show(void *data, struct seq_file *m)

{

	struct rq_qos *rqos = data;

	struct rq_wb *rwb = RQWB(rqos);



	seq_printf(m, "%lu\n", rwb->min_lat_nsec);

	return 0;

}



static int wbt_unknown_cnt_show(void *data, struct seq_file *m)

{

	struct rq_qos *rqos = data;

	struct rq_wb *rwb = RQWB(rqos);



	seq_printf(m, "%u\n", rwb->unknown_cnt);

	return 0;

}



static int wbt_normal_show(void *data, struct seq_file *m)

{

	struct rq_qos *rqos = data;

	struct rq_wb *rwb = RQWB(rqos);



	seq_printf(m, "%u\n", rwb->wb_normal);

	return 0;

}



static int wbt_background_show(void *data, struct seq_file *m)

{

	struct rq_qos *rqos = data;

	struct rq_wb *rwb = RQWB(rqos);



	seq_printf(m, "%u\n", rwb->wb_background);

	return 0;

}



static const struct blk_mq_debugfs_attr wbt_debugfs_attrs[] = {

	{"curr_win_nsec", 0400, wbt_curr_win_nsec_show},

	{"enabled", 0400, wbt_enabled_show},

	{"id", 0400, wbt_id_show},

	{"inflight", 0400, wbt_inflight_show},

	{"min_lat_nsec", 0400, wbt_min_lat_nsec_show},

	{"unknown_cnt", 0400, wbt_unknown_cnt_show},

	{"wb_normal", 0400, wbt_normal_show},

	{"wb_background", 0400, wbt_background_show},

	{},

};

#endif



static struct rq_qos_ops wbt_rqos_ops = {

	.throttle = wbt_wait,

	.issue = wbt_issue,
@@ -723,6 +811,9 @@ static struct rq_qos_ops wbt_rqos_ops = { 
	.done = wbt_done,

	.cleanup = wbt_cleanup,

	.exit = wbt_exit,

#ifdef CONFIG_BLK_DEBUG_FS

	.debugfs_attrs = wbt_debugfs_attrs,

#endif

};



int wbt_init(struct request_queue *q)