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Commit d8a0cbfd authored by Jens Axboe's avatar Jens Axboe
Browse files

blk-wbt: store queue instead of bdi 



The bdi was a leftover from when the code was block layer agnostic.
Now that we just support a block layer user, store the queue directly.

Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent bbd7bb70

block/blk-wbt.c

+12 −8
Original line number Diff line number Diff line
@@ -96,7 +96,7 @@ static void wb_timestamp(struct rq_wb *rwb, unsigned long *var) 
 */

static bool wb_recent_wait(struct rq_wb *rwb)

{

	struct bdi_writeback *wb = &rwb->bdi->wb;

	struct bdi_writeback *wb = &rwb->queue->backing_dev_info.wb;



	return time_before(jiffies, wb->dirty_sleep + HZ);

}
@@ -279,6 +279,7 @@ enum { 


static int __latency_exceeded(struct rq_wb *rwb, struct blk_rq_stat *stat)

{

	struct backing_dev_info *bdi = &rwb->queue->backing_dev_info;

	u64 thislat;



	/*
@@ -293,7 +294,7 @@ static int __latency_exceeded(struct rq_wb *rwb, struct blk_rq_stat *stat) 
	thislat = rwb_sync_issue_lat(rwb);

	if (thislat > rwb->cur_win_nsec ||

	    (thislat > rwb->min_lat_nsec && !stat[0].nr_samples)) {

		trace_wbt_lat(rwb->bdi, thislat);

		trace_wbt_lat(bdi, thislat);

		return LAT_EXCEEDED;

	}
@@ -317,13 +318,13 @@ static int __latency_exceeded(struct rq_wb *rwb, struct blk_rq_stat *stat) 
	 * If the 'min' latency exceeds our target, step down.

	 */

	if (stat[0].min > rwb->min_lat_nsec) {

		trace_wbt_lat(rwb->bdi, stat[0].min);

		trace_wbt_stat(rwb->bdi, stat);

		trace_wbt_lat(bdi, stat[0].min);

		trace_wbt_stat(bdi, stat);

		return LAT_EXCEEDED;

	}



	if (rwb->scale_step)

		trace_wbt_stat(rwb->bdi, stat);

		trace_wbt_stat(bdi, stat);



	return LAT_OK;

}
@@ -338,7 +339,9 @@ static int latency_exceeded(struct rq_wb *rwb) 


static void rwb_trace_step(struct rq_wb *rwb, const char *msg)

{

	trace_wbt_step(rwb->bdi, msg, rwb->scale_step, rwb->cur_win_nsec,

	struct backing_dev_info *bdi = &rwb->queue->backing_dev_info;



	trace_wbt_step(bdi, msg, rwb->scale_step, rwb->cur_win_nsec,

			rwb->wb_background, rwb->wb_normal, rwb->wb_max);

}
@@ -420,7 +423,8 @@ static void wb_timer_fn(unsigned long data) 


	status = latency_exceeded(rwb);



	trace_wbt_timer(rwb->bdi, status, rwb->scale_step, inflight);

	trace_wbt_timer(&rwb->queue->backing_dev_info, status, rwb->scale_step,

			inflight);



	/*

	 * If we exceeded the latency target, step down. If we did not,
@@ -700,7 +704,7 @@ int wbt_init(struct request_queue *q, struct wb_stat_ops *ops) 
	rwb->wc = 1;

	rwb->queue_depth = RWB_DEF_DEPTH;

	rwb->last_comp = rwb->last_issue = jiffies;

	rwb->bdi = &q->backing_dev_info;

	rwb->queue = q;

	rwb->win_nsec = RWB_WINDOW_NSEC;

	rwb->stat_ops = ops;

	rwb->ops_data = q;

block/blk-wbt.h

+1 −3
Original line number Diff line number Diff line
@@ -87,7 +87,7 @@ struct rq_wb { 
	unsigned long last_issue;		/* last non-throttled issue */

	unsigned long last_comp;		/* last non-throttled comp */

	unsigned long min_lat_nsec;

	struct backing_dev_info *bdi;

	struct request_queue *queue;

	struct rq_wait rq_wait[WBT_NUM_RWQ];



	struct wb_stat_ops *stat_ops;
@@ -104,8 +104,6 @@ static inline unsigned int wbt_inflight(struct rq_wb *rwb) 
	return ret;

}



struct backing_dev_info;



#ifdef CONFIG_BLK_WBT



void __wbt_done(struct rq_wb *, enum wbt_flags);