diff options
| author | Jens Axboe <axboe@kernel.dk> | 2019-05-10 10:56:32 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-16 19:41:17 +0200 |
| commit | 824c212908b6a6b9bac8fc21cdeec24021f390d0 (patch) | |
| tree | 6d4b0180653c002afdca6d2683cbdb7d1e47da4c /include/linux | |
| parent | 3351e9d39947881910230a73be77e6f29ab8b72e (diff) | |
| download | linux-stable-824c212908b6a6b9bac8fc21cdeec24021f390d0.tar.gz linux-stable-824c212908b6a6b9bac8fc21cdeec24021f390d0.tar.bz2 linux-stable-824c212908b6a6b9bac8fc21cdeec24021f390d0.zip | |
bfq: update internal depth state when queue depth changes
commit 77f1e0a52d26242b6c2dba019f6ebebfb9ff701e upstream
A previous commit moved the shallow depth and BFQ depth map calculations
to be done at init time, moving it outside of the hotter IO path. This
potentially causes hangs if the users changes the depth of the scheduler
map, by writing to the 'nr_requests' sysfs file for that device.
Add a blk-mq-sched hook that allows blk-mq to inform the scheduler if
the depth changes, so that the scheduler can update its internal state.
Signed-off-by: Eric Wheeler <bfq@linux.ewheeler.net>
Tested-by: Kai Krakow <kai@kaishome.de>
Reported-by: Paolo Valente <paolo.valente@linaro.org>
Fixes: f0635b8a416e ("bfq: calculate shallow depths at init time")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Cc: stable@vger.kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/elevator.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/elevator.h b/include/linux/elevator.h index a02deea30185..a2bf4a6b9316 100644 --- a/include/linux/elevator.h +++ b/include/linux/elevator.h @@ -99,6 +99,7 @@ struct elevator_mq_ops { void (*exit_sched)(struct elevator_queue *); int (*init_hctx)(struct blk_mq_hw_ctx *, unsigned int); void (*exit_hctx)(struct blk_mq_hw_ctx *, unsigned int); + void (*depth_updated)(struct blk_mq_hw_ctx *); bool (*allow_merge)(struct request_queue *, struct request *, struct bio *); bool (*bio_merge)(struct blk_mq_hw_ctx *, struct bio *); |