From: Mike Snitzer <snitzer@redhat.com>
To: Jens Axboe <axboe@kernel.dk>
Cc: linux-block@vger.kernel.org, dm-devel@redhat.com,
Mikulas Patocka <mpatocka@redhat.com>
Subject: [PATCH v4 1/7] dm: dont rewrite dm_disk(md)->part0.in_flight
Date: Thu, 6 Dec 2018 11:41:16 -0500 [thread overview]
Message-ID: <20181206164122.2166-2-snitzer@redhat.com> (raw)
In-Reply-To: <20181206164122.2166-1-snitzer@redhat.com>
From: Mikulas Patocka <mpatocka@redhat.com>
generic_start_io_acct and generic_end_io_acct already update the variable
in_flight using atomic operations, so we don't have to overwrite them
again.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
---
drivers/md/dm.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index a733e4c920af..a8ae7931bce7 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -663,8 +663,7 @@ static void start_io_acct(struct dm_io *io)
generic_start_io_acct(md->queue, bio_op(bio), bio_sectors(bio),
&dm_disk(md)->part0);
- atomic_set(&dm_disk(md)->part0.in_flight[rw],
- atomic_inc_return(&md->pending[rw]));
+ atomic_inc(&md->pending[rw]);
if (unlikely(dm_stats_used(&md->stats)))
dm_stats_account_io(&md->stats, bio_data_dir(bio),
@@ -693,7 +692,6 @@ static void end_io_acct(struct dm_io *io)
* a flush.
*/
pending = atomic_dec_return(&md->pending[rw]);
- atomic_set(&dm_disk(md)->part0.in_flight[rw], pending);
pending += atomic_read(&md->pending[rw^0x1]);
/* nudge anyone waiting on suspend queue */
--
2.15.0
next prev parent reply other threads:[~2018-12-06 16:41 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-06 16:41 [PATCH v4 0/7] per-cpu in_flight counters for bio-based drivers Mike Snitzer
2018-12-06 16:41 ` Mike Snitzer [this message]
2018-12-06 16:41 ` [PATCH v4 2/7] dm rq: leverage blk_mq_queue_busy() to check for outstanding IO Mike Snitzer
2018-12-06 16:41 ` [PATCH v4 3/7] block: stop passing 'cpu' to all percpu stats methods Mike Snitzer
2018-12-06 16:41 ` [PATCH v4 4/7] block: delete part_round_stats and switch to less precise counting Mike Snitzer
2018-12-06 16:41 ` [PATCH v4 5/7] block: switch to per-cpu in-flight counters Mike Snitzer
2018-12-06 16:41 ` [PATCH v4 6/7] block: return just one value from part_in_flight Mike Snitzer
2018-12-06 16:41 ` [PATCH v4 7/7] dm: remove the pending IO accounting Mike Snitzer
2018-12-06 18:00 ` [PATCH v4 0/7] per-cpu in_flight counters for bio-based drivers Mike Snitzer
2018-12-06 19:04 ` Mike Snitzer
2018-12-10 15:35 ` Jens Axboe
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