Searched hist:"5 b2050718d095cd3242d1f42aaaea3a2fec8e6f0" (Results 1 – 1 of 1) sorted by relevance
| /openbmc/linux/block/ |
| H A D | blk-merge.c | diff 5b2050718d095cd3242d1f42aaaea3a2fec8e6f0 Fri Mar 11 11:21:43 CST 2022 Jens Axboe <axboe@kernel.dk> block: ensure plug merging checks the correct queue at least once
Song reports that a RAID rebuild workload runs much slower recently,
and it is seeing a lot less merging than it did previously. The reason
is that a previous commit reduced the amount of work we do for plug
merging. RAID rebuild interleaves requests between disks, so a last-entry
check in plug merging always misses a merge opportunity since we always
find a different disk than what we are looking for.
Modify the logic such that it's still a one-hit cache, but ensure that
we check enough to find the right target before giving up.
Fixes: d38a9c04c0d5 ("block: only check previous entry for plug merge attempt")
Reported-and-tested-by: Song Liu <song@kernel.org>
Reviewed-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|