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block: add a blk_account_io_merge_bio helper

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Move the non-"new_io" branch of blk_account_io_start() into separate
function.  Fix merge accounting for discards (they were counted as write
merges).

The new blk_account_io_merge_bio() doesn't call update_io_ticks() unlike
blk_account_io_start(), as there is no reason for that.

[hch: rebased]

Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Konstantin Khlebnikov 2020-05-27 07:24:16 +02:00 committed by Jens Axboe
parent b9c54f5660
commit b5af37ab3a
4 changed files with 19 additions and 12 deletions
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25
block/blk-core.c
View File

@ -636,6 +636,16 @@ void blk_put_request(struct request *req)
}
EXPORT_SYMBOL(blk_put_request);
static void blk_account_io_merge_bio(struct request *req)
{
if (!blk_do_io_stat(req))
return;
part_stat_lock();
part_stat_inc(req->part, merges[op_stat_group(req_op(req))]);
part_stat_unlock();
}
bool bio_attempt_back_merge(struct request *req, struct bio *bio,
unsigned int nr_segs)
{
@ -656,7 +666,7 @@ bool bio_attempt_back_merge(struct request *req, struct bio *bio,
bio_crypt_free_ctx(bio);
blk_account_io_start(req, false);
blk_account_io_merge_bio(req);
return true;
}
@ -682,7 +692,7 @@ bool bio_attempt_front_merge(struct request *req, struct bio *bio,
bio_crypt_do_front_merge(req, bio);
blk_account_io_start(req, false);
blk_account_io_merge_bio(req);
return true;
}
@ -704,7 +714,7 @@ bool bio_attempt_discard_merge(struct request_queue *q, struct request *req,
req->__data_len += bio->bi_iter.bi_size;
req->nr_phys_segments = segments + 1;
blk_account_io_start(req, false);
blk_account_io_merge_bio(req);
return true;
no_merge:
req_set_nomerge(q, req);
@ -1329,7 +1339,7 @@ blk_status_t blk_insert_cloned_request(struct request_queue *q, struct request *
return BLK_STS_IOERR;
if (blk_queue_io_stat(q))
blk_account_io_start(rq, true);
blk_account_io_start(rq);
/*
* Since we have a scheduler attached on the top device,
@ -1433,16 +1443,13 @@ void blk_account_io_done(struct request *req, u64 now)
}
}
void blk_account_io_start(struct request *rq, bool new_io)
void blk_account_io_start(struct request *rq)
{
if (!blk_do_io_stat(rq))
return;
part_stat_lock();
if (!new_io)
part_stat_inc(rq->part, merges[rq_data_dir(rq)]);
else
rq->part = disk_map_sector_rcu(rq->rq_disk, blk_rq_pos(rq));
rq->part = disk_map_sector_rcu(rq->rq_disk, blk_rq_pos(rq));
update_io_ticks(rq->part, jiffies, false);
part_stat_unlock();
}

2
block/blk-exec.c
View File

@ -55,7 +55,7 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk,
rq->rq_disk = bd_disk;
rq->end_io = done;
blk_account_io_start(rq, true);
blk_account_io_start(rq);
/*
* don't check dying flag for MQ because the request won't

2
block/blk-mq.c
View File

@ -1822,7 +1822,7 @@ static void blk_mq_bio_to_request(struct request *rq, struct bio *bio,
blk_rq_bio_prep(rq, bio, nr_segs);
blk_crypto_rq_bio_prep(rq, bio, GFP_NOIO);
blk_account_io_start(rq, true);
blk_account_io_start(rq);
}
static blk_status_t __blk_mq_issue_directly(struct blk_mq_hw_ctx *hctx,

2
block/blk.h
View File

@ -185,7 +185,7 @@ bool bio_attempt_discard_merge(struct request_queue *q, struct request *req,
bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
unsigned int nr_segs, struct request **same_queue_rq);
void blk_account_io_start(struct request *req, bool new_io);
void blk_account_io_start(struct request *req);
void blk_account_io_done(struct request *req, u64 now);
/*