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authorChristoph Hellwig <hch@lst.de>2020-05-27 08:24:19 +0300
committerJens Axboe <axboe@kernel.dk>2020-05-27 14:21:23 +0300
commit524f9ffd6a4d3622aa48ca286ff85a30ed1cdbcf (patch)
treee04d89fd97ee32e1d7d66eaa881c0c035d1db0f4 /block
parentb2d76adbc0828e0f108567973bcc500ed1abc139 (diff)
downloadlinux-524f9ffd6a4d3622aa48ca286ff85a30ed1cdbcf.tar.xz
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>
Diffstat (limited to 'block')
-rw-r--r--block/blk-core.c5
-rw-r--r--block/blk-merge.c3
2 files changed, 5 insertions, 3 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index bf2f7d4bc0c1..a01fb2b508f0 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -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();
}
diff --git a/block/blk-merge.c b/block/blk-merge.c
index c3beae5c1be7..f0b0bae075a0 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -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);
}
}