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blk-wbt: cleanup disable-by-default for CFQ 

Make it clear that we are disabling wbt for the specified queued,
if it was enabled by default. This is in preparation for allowing
users to re-enable wbt, and not have it disabled automatically
again.

Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jens Axboe 2016-11-28 09:25:50 -07:00
parent 80e091d10e
commit fa224eed2b
3 changed files with 13 additions and 10 deletions
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10
block/blk-wbt.c
View File

@ -665,15 +665,21 @@ void wbt_set_write_cache(struct rq_wb *rwb, bool write_cache_on)
rwb->wc = write_cache_on;
}
void wbt_disable(struct rq_wb *rwb)
/*
* Disable wbt, if enabled by default. Only called from CFQ, if we have
* cgroups enabled
*/
void wbt_disable_default(struct request_queue *q)
{
struct rq_wb *rwb = q->rq_wb;
if (rwb) {
del_timer_sync(&rwb->window_timer);
rwb->win_nsec = rwb->min_lat_nsec = 0;
wbt_update_limits(rwb);
}
}
EXPORT_SYMBOL_GPL(wbt_disable);
EXPORT_SYMBOL_GPL(wbt_disable_default);
u64 wbt_default_latency_nsec(struct request_queue *q)
{

4
block/blk-wbt.h
View File

@ -105,7 +105,7 @@ void wbt_exit(struct request_queue *);
void wbt_update_limits(struct rq_wb *);
void wbt_requeue(struct rq_wb *, struct blk_issue_stat *);
void wbt_issue(struct rq_wb *, struct blk_issue_stat *);
void wbt_disable(struct rq_wb *);
void wbt_disable_default(struct request_queue *);
void wbt_set_queue_depth(struct rq_wb *, unsigned int);
void wbt_set_write_cache(struct rq_wb *, bool);
@ -141,7 +141,7 @@ static inline void wbt_requeue(struct rq_wb *rwb, struct blk_issue_stat *stat)
static inline void wbt_issue(struct rq_wb *rwb, struct blk_issue_stat *stat)
{
}
static inline void wbt_disable(struct rq_wb *rwb)
static inline void wbt_disable_default(struct request_queue *q)
{
}
static inline void wbt_set_queue_depth(struct rq_wb *rwb, unsigned int depth)

9
block/cfq-iosched.c
View File

@ -3780,13 +3780,10 @@ static void check_blkcg_changed(struct cfq_io_cq *cic, struct bio *bio)
/*
* If we have a non-root cgroup, we can depend on that to
* do proper throttling of writes. Turn off wbt for that
* case.
* case, if it was enabled by default.
*/
if (nonroot_cg) {
struct request_queue *q = cfqd->queue;
wbt_disable(q->rq_wb);
}
if (nonroot_cg)
wbt_disable_default(cfqd->queue);
/*
* Drop reference to queues. New queues will be assigned in new