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block: revert 4f1e9630af ("blk-throtl: optimize IOPS throttle for large IO scenarios")

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Revert commit 4f1e9630af ("blk-throtl: optimize IOPS throttle for large
IO scenarios") since we have another easier way to address this issue and
get better iops throttling result.

Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20220216044514.2903784-9-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2022-02-16 12:45:14 +08:00 committed by Jens Axboe
parent 5a93b6027e
commit 34841e6fb1
2 changed files with 0 additions and 33 deletions
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28
block/blk-throttle.c
View File

@ -640,8 +640,6 @@ static inline void throtl_start_new_slice_with_credit(struct throtl_grp *tg,
tg->bytes_disp[rw] = 0;
tg->io_disp[rw] = 0;
atomic_set(&tg->io_split_cnt[rw], 0);
/*
* Previous slice has expired. We must have trimmed it after last
* bio dispatch. That means since start of last slice, we never used
@ -665,8 +663,6 @@ static inline void throtl_start_new_slice(struct throtl_grp *tg, bool rw)
tg->slice_start[rw] = jiffies;
tg->slice_end[rw] = jiffies + tg->td->throtl_slice;
atomic_set(&tg->io_split_cnt[rw], 0);
throtl_log(&tg->service_queue,
"[%c] new slice start=%lu end=%lu jiffies=%lu",
rw == READ ? 'R' : 'W', tg->slice_start[rw],
@ -900,9 +896,6 @@ static bool tg_may_dispatch(struct throtl_grp *tg, struct bio *bio,
jiffies + tg->td->throtl_slice);
}
if (iops_limit != UINT_MAX)
tg->io_disp[rw] += atomic_xchg(&tg->io_split_cnt[rw], 0);
if (tg_with_in_bps_limit(tg, bio, bps_limit, &bps_wait) &&
tg_with_in_iops_limit(tg, bio, iops_limit, &iops_wait)) {
if (wait)
@ -1927,14 +1920,12 @@ static void throtl_downgrade_check(struct throtl_grp *tg)
}
if (tg->iops[READ][LIMIT_LOW]) {
tg->last_io_disp[READ] += atomic_xchg(&tg->last_io_split_cnt[READ], 0);
iops = tg->last_io_disp[READ] * HZ / elapsed_time;
if (iops >= tg->iops[READ][LIMIT_LOW])
tg->last_low_overflow_time[READ] = now;
}
if (tg->iops[WRITE][LIMIT_LOW]) {
tg->last_io_disp[WRITE] += atomic_xchg(&tg->last_io_split_cnt[WRITE], 0);
iops = tg->last_io_disp[WRITE] * HZ / elapsed_time;
if (iops >= tg->iops[WRITE][LIMIT_LOW])
tg->last_low_overflow_time[WRITE] = now;
@ -2053,25 +2044,6 @@ static inline void throtl_update_latency_buckets(struct throtl_data *td)
}
#endif
void blk_throtl_charge_bio_split(struct bio *bio)
{
struct blkcg_gq *blkg = bio->bi_blkg;
struct throtl_grp *parent = blkg_to_tg(blkg);
struct throtl_service_queue *parent_sq;
bool rw = bio_data_dir(bio);
do {
if (!parent->has_rules[rw])
break;
atomic_inc(&parent->io_split_cnt[rw]);
atomic_inc(&parent->last_io_split_cnt[rw]);
parent_sq = parent->service_queue.parent_sq;
parent = sq_to_tg(parent_sq);
} while (parent);
}
bool __blk_throtl_bio(struct bio *bio)
{
struct request_queue *q = bdev_get_queue(bio->bi_bdev);

5
block/blk-throttle.h
View File

@ -138,9 +138,6 @@ struct throtl_grp {
unsigned int bad_bio_cnt; /* bios exceeding latency threshold */
unsigned long bio_cnt_reset_time;
atomic_t io_split_cnt[2];
atomic_t last_io_split_cnt[2];
struct blkg_rwstat stat_bytes;
struct blkg_rwstat stat_ios;
};
@ -164,13 +161,11 @@ static inline struct throtl_grp *blkg_to_tg(struct blkcg_gq *blkg)
static inline int blk_throtl_init(struct request_queue *q) { return 0; }
static inline void blk_throtl_exit(struct request_queue *q) { }
static inline void blk_throtl_register_queue(struct request_queue *q) { }
static inline void blk_throtl_charge_bio_split(struct bio *bio) { }
static inline bool blk_throtl_bio(struct bio *bio) { return false; }
#else /* CONFIG_BLK_DEV_THROTTLING */
int blk_throtl_init(struct request_queue *q);
void blk_throtl_exit(struct request_queue *q);
void blk_throtl_register_queue(struct request_queue *q);
void blk_throtl_charge_bio_split(struct bio *bio);
bool __blk_throtl_bio(struct bio *bio);
static inline bool blk_throtl_bio(struct bio *bio)
{