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block: reduce part_stat_lock() scope 

We only need the stats lock (aka preempt_disable()) for updating the
states, not for looking up or dropping the hd_struct reference.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2020-05-27 07:24:19 +02:00 committed by Jens Axboe
parent b2d76adbc0
commit 524f9ffd6a
2 changed files with 5 additions and 3 deletions
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5
block/blk-core.c
View File

@ -1437,9 +1437,9 @@ void blk_account_io_done(struct request *req, u64 now)
update_io_ticks(part, jiffies, true);
part_stat_inc(part, ios[sgrp]);
part_stat_add(part, nsecs[sgrp], now - req->start_time_ns);
part_stat_unlock();
hd_struct_put(part);
part_stat_unlock();
}
}
@ -1448,8 +1448,9 @@ void blk_account_io_start(struct request *rq)
if (!blk_do_io_stat(rq))
return;
part_stat_lock();
rq->part = disk_map_sector_rcu(rq->rq_disk, blk_rq_pos(rq));
part_stat_lock();
update_io_ticks(rq->part, jiffies, false);
part_stat_unlock();
}

3
block/blk-merge.c
View File

@ -674,8 +674,9 @@ static void blk_account_io_merge_request(struct request *req)
if (blk_do_io_stat(req)) {
part_stat_lock();
part_stat_inc(req->part, merges[op_stat_group(req_op(req))]);
hd_struct_put(req->part);
part_stat_unlock();
hd_struct_put(req->part);
}
}