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

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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: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2018-05-07 09:57:08 -06:00
parent 825843b0ad
commit 8bea609019
2 changed files with 18 additions and 11 deletions
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25
block/blk-wbt.c
View File

@ -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;
}

4
block/blk-wbt.h
View File

@ -19,7 +19,9 @@ enum wbt_flags {
};
enum {
WBT_NUM_RWQ = 2,
WBT_RWQ_BG = 0,
WBT_RWQ_KSWAPD,
WBT_NUM_RWQ,
};
/*