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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>
This commit is contained in:
Kemeng Shi 2022-10-18 19:12:39 +08:00 committed by Jens Axboe
parent db5896e9cf
commit 6891f96898
1 changed files with 4 additions and 2 deletions
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6
block/blk-iolatency.c
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@ -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)
{