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dm: skip dm-stats work in alloc_io() unless needed
author
Mike Snitzer
<snitzer@kernel.org>
Tue, 13 Jun 2023 20:02:17 +0000
(16:02 -0400)
committer
Mike Snitzer
<snitzer@kernel.org>
Fri, 16 Jun 2023 22:24:13 +0000
(18:24 -0400)
Don't dm_stats_record_start() if dm_stats_used() is false.
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
drivers/md/dm.c
patch
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diff --git
a/drivers/md/dm.c
b/drivers/md/dm.c
index
658323a
..
ea1671c
100644
(file)
--- a/
drivers/md/dm.c
+++ b/
drivers/md/dm.c
@@
-597,7
+597,8
@@
static struct dm_io *alloc_io(struct mapped_device *md, struct bio *bio)
if (blk_queue_io_stat(md->queue))
dm_io_set_flag(io, DM_IO_BLK_STAT);
- if (static_branch_unlikely(&stats_enabled))
+ if (static_branch_unlikely(&stats_enabled) &&
+ unlikely(dm_stats_used(&md->stats)))
dm_stats_record_start(&md->stats, &io->stats_aux);
return io;