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Commit 8bea6090 authored by Jens Axboe's avatar Jens Axboe
Browse files

blk-wbt: pass in enum wbt_flags to get_rq_wait() 



This is in preparation for having more write queues, in which
case we would have needed to pass in more information than just
a simple 'is_kswapd' boolean.

Reviewed-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: default avatarOmar Sandoval <osandov@fb.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 825843b0

block/blk-wbt.c

+15 −10
Original line number Diff line number Diff line
@@ -101,9 +101,13 @@ static bool wb_recent_wait(struct rq_wb *rwb) 
	return time_before(jiffies, wb->dirty_sleep + HZ);

}



static inline struct rq_wait *get_rq_wait(struct rq_wb *rwb, bool is_kswapd)

static inline struct rq_wait *get_rq_wait(struct rq_wb *rwb,

					  enum wbt_flags wb_acct)

{

	return &rwb->rq_wait[is_kswapd];

	if (wb_acct & WBT_KSWAPD)

		return &rwb->rq_wait[WBT_RWQ_KSWAPD];



	return &rwb->rq_wait[WBT_RWQ_BG];

}



static void rwb_wake_all(struct rq_wb *rwb)
@@ -126,7 +130,7 @@ void __wbt_done(struct rq_wb *rwb, enum wbt_flags wb_acct) 
	if (!(wb_acct & WBT_TRACKED))

		return;



	rqw = get_rq_wait(rwb, wb_acct & WBT_KSWAPD);

	rqw = get_rq_wait(rwb, wb_acct);

	inflight = atomic_dec_return(&rqw->inflight);



	/*
@@ -529,11 +533,12 @@ static inline bool may_queue(struct rq_wb *rwb, struct rq_wait *rqw, 
 * Block if we will exceed our limit, or if we are currently waiting for

 * the timer to kick off queuing again.

 */

static void __wbt_wait(struct rq_wb *rwb, unsigned long rw, spinlock_t *lock)

static void __wbt_wait(struct rq_wb *rwb, enum wbt_flags wb_acct,

		       unsigned long rw, spinlock_t *lock)

	__releases(lock)

	__acquires(lock)

{

	struct rq_wait *rqw = get_rq_wait(rwb, current_is_kswapd());

	struct rq_wait *rqw = get_rq_wait(rwb, wb_acct);

	DEFINE_WAIT(wait);



	if (may_queue(rwb, rqw, &wait, rw))
@@ -584,7 +589,7 @@ static inline bool wbt_should_throttle(struct rq_wb *rwb, struct bio *bio) 
 */

enum wbt_flags wbt_wait(struct rq_wb *rwb, struct bio *bio, spinlock_t *lock)

{

	unsigned int ret = 0;

	enum wbt_flags ret = 0;



	if (!rwb_enabled(rwb))

		return 0;
@@ -598,14 +603,14 @@ enum wbt_flags wbt_wait(struct rq_wb *rwb, struct bio *bio, spinlock_t *lock) 
		return ret;

	}



	__wbt_wait(rwb, bio->bi_opf, lock);

	if (current_is_kswapd())

		ret |= WBT_KSWAPD;



	__wbt_wait(rwb, ret, bio->bi_opf, lock);



	if (!blk_stat_is_active(rwb->cb))

		rwb_arm_timer(rwb);



	if (current_is_kswapd())

		ret |= WBT_KSWAPD;



	return ret | WBT_TRACKED;

}

block/blk-wbt.h

+3 −1
Original line number Diff line number Diff line
@@ -19,7 +19,9 @@ enum wbt_flags { 
};



enum {

	WBT_NUM_RWQ		= 2,

	WBT_RWQ_BG		= 0,

	WBT_RWQ_KSWAPD,

	WBT_NUM_RWQ,

};



/*