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block, bfq: factor out a helper to split bfqq in bfq_init_rq()

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Make code cleaner, there are no functional changes.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Link: https://lore.kernel.org/r/20240909134154.954924-8-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Yu Kuai 2024-09-09 21:41:54 +08:00 committed by Jens Axboe
parent 3c61429c29
commit a7609d2aec
1 changed files with 58 additions and 51 deletions
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107
block/bfq-iosched.c
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@ -6737,10 +6737,9 @@ bfq_split_bfqq(struct bfq_io_cq *bic, struct bfq_queue *bfqq)
return NULL;
}
static struct bfq_queue *bfq_get_bfqq_handle_split(struct bfq_data *bfqd,
struct bfq_io_cq *bic,
struct bio *bio,
bool split, bool is_sync,
static struct bfq_queue *
__bfq_get_bfqq_handle_split(struct bfq_data *bfqd, struct bfq_io_cq *bic,
struct bio *bio, bool split, bool is_sync,
bool *new_queue)
{
unsigned int act_idx = bfq_actuator_index(bfqd, bio);
@ -6845,6 +6844,59 @@ static struct bfq_queue *bfq_waker_bfqq(struct bfq_queue *bfqq)
return waker_bfqq;
}
static struct bfq_queue *bfq_get_bfqq_handle_split(struct bfq_data *bfqd,
struct bfq_io_cq *bic,
struct bio *bio,
unsigned int idx,
bool is_sync)
{
struct bfq_queue *waker_bfqq;
struct bfq_queue *bfqq;
bool new_queue = false;
bfqq = __bfq_get_bfqq_handle_split(bfqd, bic, bio, false, is_sync,
&new_queue);
if (unlikely(new_queue))
return bfqq;
/* If the queue was seeky for too long, break it apart. */
if (!bfq_bfqq_coop(bfqq) || !bfq_bfqq_split_coop(bfqq) ||
bic->bfqq_data[idx].stably_merged)
return bfqq;
waker_bfqq = bfq_waker_bfqq(bfqq);
/* Update bic before losing reference to bfqq */
if (bfq_bfqq_in_large_burst(bfqq))
bic->bfqq_data[idx].saved_in_large_burst = true;
bfqq = bfq_split_bfqq(bic, bfqq);
if (bfqq) {
bfq_bfqq_resume_state(bfqq, bfqd, bic, true);
return bfqq;
}
bfqq = __bfq_get_bfqq_handle_split(bfqd, bic, bio, true, is_sync, NULL);
if (unlikely(bfqq == &bfqd->oom_bfqq))
return bfqq;
bfq_bfqq_resume_state(bfqq, bfqd, bic, false);
bfqq->waker_bfqq = waker_bfqq;
bfqq->tentative_waker_bfqq = NULL;
/*
* If the waker queue disappears, then new_bfqq->waker_bfqq must be
* reset. So insert new_bfqq into the
* woken_list of the waker. See
* bfq_check_waker for details.
*/
if (waker_bfqq)
hlist_add_head(&bfqq->woken_list_node,
&bfqq->waker_bfqq->woken_list);
return bfqq;
}
/*
* If needed, init rq, allocate bfq data structures associated with
* rq, and increment reference counters in the destination bfq_queue
@ -6876,7 +6928,6 @@ static struct bfq_queue *bfq_init_rq(struct request *rq)
struct bfq_io_cq *bic;
const int is_sync = rq_is_sync(rq);
struct bfq_queue *bfqq;
bool new_queue = false;
unsigned int a_idx = bfq_actuator_index(bfqd, bio);
if (unlikely(!rq->elv.icq))
@ -6893,53 +6944,9 @@ static struct bfq_queue *bfq_init_rq(struct request *rq)
return RQ_BFQQ(rq);
bic = icq_to_bic(rq->elv.icq);
bfq_check_ioprio_change(bic, bio);
bfq_bic_update_cgroup(bic, bio);
bfqq = bfq_get_bfqq_handle_split(bfqd, bic, bio, false, is_sync,
&new_queue);
if (likely(!new_queue)) {
/* If the queue was seeky for too long, break it apart. */
if (bfq_bfqq_coop(bfqq) && bfq_bfqq_split_coop(bfqq) &&
!bic->bfqq_data[a_idx].stably_merged) {
struct bfq_queue *waker_bfqq = bfq_waker_bfqq(bfqq);
/* Update bic before losing reference to bfqq */
if (bfq_bfqq_in_large_burst(bfqq))
bic->bfqq_data[a_idx].saved_in_large_burst =
true;
bfqq = bfq_split_bfqq(bic, bfqq);
if (!bfqq) {
bfqq = bfq_get_bfqq_handle_split(bfqd, bic, bio,
true, is_sync,
NULL);
if (likely(bfqq != &bfqd->oom_bfqq)) {
bfq_bfqq_resume_state(bfqq, bfqd, bic,
false);
bfqq->waker_bfqq = waker_bfqq;
bfqq->tentative_waker_bfqq = NULL;
/*
* If the waker queue disappears, then
* new_bfqq->waker_bfqq must be
* reset. So insert new_bfqq into the
* woken_list of the waker. See
* bfq_check_waker for details.
*/
if (waker_bfqq)
hlist_add_head(
&bfqq->woken_list_node,
&bfqq->waker_bfqq->woken_list);
}
} else {
bfq_bfqq_resume_state(bfqq, bfqd, bic, true);
}
}
}
bfqq = bfq_get_bfqq_handle_split(bfqd, bic, bio, a_idx, is_sync);
bfqq_request_allocated(bfqq);
bfqq->ref++;