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| author | Paolo Valente <paolo.valente@linaro.org> | 2021-03-04 18:46:25 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-03-25 10:50:07 -0600 |
| commit | 8c544770092a3d7532d01903b75721e537d87001 (patch) | |
| tree | 6edf02cf8f6160c4def62a44b62b79d6b571d204 /block | |
| parent | 8ef3fc3a043cd4b3dfdb260f02be5f65cc31445d (diff) | |
| download | linux-8c544770092a3d7532d01903b75721e537d87001.tar.gz linux-8c544770092a3d7532d01903b75721e537d87001.tar.bz2 linux-8c544770092a3d7532d01903b75721e537d87001.zip | |
block, bfq: fix weight-raising resume with !low_latency
When the io_latency heuristic is off, bfq_queues must not start to be
weight-raised. Unfortunately, by mistake, this may happen when the
state of a previously weight-raised bfq_queue is resumed after a queue
split. This commit fixes this error.
Tested-by: Jan Kara <jack@suse.cz>
Signed-off-by: Paolo Valente <paolo.valente@linaro.org>
Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Link: https://lore.kernel.org/r/20210304174627.161-5-paolo.valente@linaro.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
| -rw-r--r-- | block/bfq-iosched.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c index b00dcc46bac7..2a84294b0525 100644 --- a/block/bfq-iosched.c +++ b/block/bfq-iosched.c @@ -1012,7 +1012,7 @@ static void bfq_bfqq_resume_state(struct bfq_queue *bfqq, struct bfq_data *bfqd, struct bfq_io_cq *bic, bool bfq_already_existing) { - unsigned int old_wr_coeff = bfqq->wr_coeff; + unsigned int old_wr_coeff = 1; bool busy = bfq_already_existing && bfq_bfqq_busy(bfqq); if (bic->saved_has_short_ttime) @@ -1033,7 +1033,13 @@ bfq_bfqq_resume_state(struct bfq_queue *bfqq, struct bfq_data *bfqd, bfqq->ttime = bic->saved_ttime; bfqq->io_start_time = bic->saved_io_start_time; bfqq->tot_idle_time = bic->saved_tot_idle_time; - bfqq->wr_coeff = bic->saved_wr_coeff; + /* + * Restore weight coefficient only if low_latency is on + */ + if (bfqd->low_latency) { + old_wr_coeff = bfqq->wr_coeff; + bfqq->wr_coeff = bic->saved_wr_coeff; + } bfqq->service_from_wr = bic->saved_service_from_wr; bfqq->wr_start_at_switch_to_srt = bic->saved_wr_start_at_switch_to_srt; bfqq->last_wr_start_finish = bic->saved_last_wr_start_finish; |