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dm writecache: count number of blocks read, not number of read bios

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Change dm-writecache, so that it counts the number of blocks read
instead of the number of read bios. Bios can be split and requeued
using the dm_accept_partial_bio function, so counting bios caused
inaccurate results.

Fixes: e3a35d0340 ("dm writecache: add event counters")
Reported-by: Yu Kuai <yukuai1@huaweicloud.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
This commit is contained in:
Mikulas Patocka 2022-07-11 16:30:52 -04:00 committed by Mike Snitzer
parent 9bc0c92e4b
commit 2c6e755b49
2 changed files with 3 additions and 2 deletions
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4
Documentation/admin-guide/device-mapper/writecache.rst
View File

@ -80,8 +80,8 @@ Status:
2. the number of blocks
3. the number of free blocks
4. the number of blocks under writeback
5. the number of read requests
6. the number of read requests that hit the cache
5. the number of read blocks
6. the number of read blocks that hit the cache
7. the number of write requests
8. the number of write requests that hit uncommitted block
9. the number of write requests that hit committed block

1
drivers/md/dm-writecache.c
View File

@ -1365,6 +1365,7 @@ read_next_block:
}
} else {
writecache_map_remap_origin(wc, bio, e);
wc->stats.reads += (bio->bi_iter.bi_size - wc->block_size) >> wc->block_size_bits;
map_op = WC_MAP_REMAP_ORIGIN;
}