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block: enable passthrough command statistics

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Applications using the passthrough interfaces for IO want to continue
seeing the disk stats. These requests had been fenced off from this
block layer feature. While the block layer doesn't necessarily know what
a passthrough command does, we do know the data size and direction,
which is enough to account for the command's stats.

Since tracking these has the potential to produce unexpected results,
the passthrough stats are locked behind a new queue flag that needs to
be enabled with the /sys/block/<dev>/queue/iostats_passthrough
attribute.

Signed-off-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20241007153236.2818562-1-kbusch@meta.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Keith Busch
2024-10-07 08:32:35 -07:00
committed by Jens Axboe
parent d51c9cdfc2
commit 110234da18
4 changed files with 73 additions and 1 deletions
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7
Documentation/ABI/stable/sysfs-block
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@@ -424,6 +424,13 @@ Description:
[RW] This file is used to control (on/off) the iostats
accounting of the disk.
What: /sys/block/<disk>/queue/iostats_passthrough
Date: October 2024
Contact: linux-block@vger.kernel.org
Description:
[RW] This file is used to control (on/off) the iostats
accounting of the disk for passthrough commands.
What: /sys/block/<disk>/queue/logical_block_size
Date: May 2009