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| author | Kemeng Shi <shikemeng@huawei.com> | 2022-10-18 14:12:39 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-11-01 18:12:24 +0300 |
| commit | 6891f968985f0569eaf56430518895b3c2885da1 (patch) | |
| tree | 4e954cb97720333e7f869a1fe1ef9d32888b3063 /block/blk-iolatency.c | |
| parent | db5896e9cf93f119c0b181c5e6b473d8bf0302e5 (diff) | |
| download | linux-6891f968985f0569eaf56430518895b3c2885da1.tar.xz | |
block: Correct comment for scale_cookie_change
Default queue depth of iolatency_grp is unlimited, so we scale down
quickly(once by half) in scale_cookie_change. Remove the "subtract
1/16th" part which is not the truth and add the actual way we
scale down.
Signed-off-by: Kemeng Shi <shikemeng@huawei.com>
Link: https://lore.kernel.org/r/20221018111240.22612-3-shikemeng@huawei.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-iolatency.c')
| -rw-r--r-- | block/blk-iolatency.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/block/blk-iolatency.c b/block/blk-iolatency.c index b24d7b788ba3..2c574f98c8d1 100644 --- a/block/blk-iolatency.c +++ b/block/blk-iolatency.c @@ -364,9 +364,11 @@ static void scale_cookie_change(struct blk_iolatency *blkiolat, } /* - * Change the queue depth of the iolatency_grp. We add/subtract 1/16th of the + * Change the queue depth of the iolatency_grp. We add 1/16th of the * queue depth at a time so we don't get wild swings and hopefully dial in to - * fairer distribution of the overall queue depth. + * fairer distribution of the overall queue depth. We halve the queue depth + * at a time so we can scale down queue depth quickly from default unlimited + * to target. */ static void scale_change(struct iolatency_grp *iolat, bool up) { |