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| author |   Bart Van Assche <bvanassche@acm.org> | 2021-08-24 10:05:20 -0700 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2021-08-24 16:18:01 -0600 |
| commit | b6d2b054e8baaee53fd2d4854c63cbf0f2c6262a (patch) | |
| tree | f94f83b4397f3d895bec7d974ace8e79305627ef /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | blk-mq: fix is_flush_rq (diff) | |
| download | wireguard-linux-b6d2b054e8baaee53fd2d4854c63cbf0f2c6262a.tar.xz wireguard-linux-b6d2b054e8baaee53fd2d4854c63cbf0f2c6262a.zip | |
mq-deadline: Fix request accounting
The block layer may call the I/O scheduler .finish_request() callback
without having called the .insert_requests() callback. Make sure that the
mq-deadline I/O statistics are correct if the block layer inserts an I/O
request that bypasses the I/O scheduler. This patch prevents that lower
priority I/O is delayed longer than necessary for mixed I/O priority
workloads.
Cc: Niklas Cassel <Niklas.Cassel@wdc.com>
Cc: Damien Le Moal <damien.lemoal@wdc.com>
Cc: Hannes Reinecke <hare@suse.de>
Reported-by: Niklas Cassel <Niklas.Cassel@wdc.com>
Fixes: 08a9ad8bf607 ("block/mq-deadline: Add cgroup support")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20210824170520.1659173-1-bvanassche@acm.org
Reviewed-by: Niklas Cassel <niklas.cassel@wdc.com>
Tested-by: Niklas Cassel <niklas.cassel@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions