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blk-wbt: remove stat ops

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Again a leftover from when the throttling code was generic. Now that we
just have the block user, get rid of the stat ops and indirections.

Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jens Axboe
2016-11-10 21:50:51 -07:00
parent d8a0cbfd73
commit 8054b89f8f
3 changed files with 8 additions and 43 deletions
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block/blk-wbt.c
+5 -10
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@@ -308,7 +308,7 @@ static int __latency_exceeded(struct rq_wb *rwb, struct blk_rq_stat *stat)
* waited or still has writes in flights, consider us doing
* just writes as well.
*/
if ((stat[1].nr_samples && rwb->stat_ops->is_current(stat)) ||
if ((stat[1].nr_samples && blk_stat_is_current(stat)) ||
wb_recent_wait(rwb) || wbt_inflight(rwb))
return LAT_UNKNOWN_WRITES;
return LAT_UNKNOWN;
@@ -333,7 +333,7 @@ static int latency_exceeded(struct rq_wb *rwb)
{
struct blk_rq_stat stat[2];
rwb->stat_ops->get(rwb->ops_data, stat);
blk_queue_stat_get(rwb->queue, stat);
return __latency_exceeded(rwb, stat);
}
@@ -355,7 +355,7 @@ static void scale_up(struct rq_wb *rwb)
rwb->scale_step--;
rwb->unknown_cnt = 0;
rwb->stat_ops->clear(rwb->ops_data);
blk_stat_clear(rwb->queue);
rwb->scaled_max = calc_wb_limits(rwb);
@@ -385,7 +385,7 @@ static void scale_down(struct rq_wb *rwb, bool hard_throttle)
rwb->scaled_max = false;
rwb->unknown_cnt = 0;
rwb->stat_ops->clear(rwb->ops_data);
blk_stat_clear(rwb->queue);
calc_wb_limits(rwb);
rwb_trace_step(rwb, "step down");
}
@@ -675,7 +675,7 @@ void wbt_disable(struct rq_wb *rwb)
}
EXPORT_SYMBOL_GPL(wbt_disable);
int wbt_init(struct request_queue *q, struct wb_stat_ops *ops)
int wbt_init(struct request_queue *q)
{
struct rq_wb *rwb;
int i;
@@ -688,9 +688,6 @@ int wbt_init(struct request_queue *q, struct wb_stat_ops *ops)
BUILD_BUG_ON(RWB_WINDOW_NSEC > BLK_STAT_NSEC);
BUILD_BUG_ON(WBT_NR_BITS > BLK_STAT_RES_BITS);
if (!ops->get || !ops->is_current || !ops->clear)
return -EINVAL;
rwb = kzalloc(sizeof(*rwb), GFP_KERNEL);
if (!rwb)
return -ENOMEM;
@@ -706,8 +703,6 @@ int wbt_init(struct request_queue *q, struct wb_stat_ops *ops)
rwb->last_comp = rwb->last_issue = jiffies;
rwb->queue = q;
rwb->win_nsec = RWB_WINDOW_NSEC;
rwb->stat_ops = ops;
rwb->ops_data = q;
wbt_update_limits(rwb);
/*