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block, bfq: reduce upper bound for inject limit to max_rq_in_driver+1

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Upon an increment attempt of the injection limit, the latter is
constrained not to become higher than twice the maximum number
max_rq_in_driver of I/O requests that have happened to be in service
in the drive. This high bound allows the injection limit to grow
beyond max_rq_in_driver, which may then cause max_rq_in_driver itself
to grow.

However, since the limit is incremented by only one unit at a time,
there is no need for such a high bound, and just max_rq_in_driver+1 is
enough.

Tested-by: Oleksandr Natalenko <[email protected]>
Signed-off-by: Paolo Valente <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Paolo Valente 2019-08-22 17:20:35 +02:00 • committed by Jens Axboe
commit c1e0a18228
1 changed files with 1 additions and 1 deletions
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2
block/bfq-iosched.c
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@ -5805,7 +5805,7 @@ static void bfq_update_inject_limit(struct bfq_data *bfqd,
bfqq->inject_limit--;
bfqq->decrease_time_jif = jiffies;
} else if (tot_time_ns < threshold &&
old_limit < bfqd->max_rq_in_driver<<1)
old_limit <= bfqd->max_rq_in_driver)
bfqq->inject_limit++;
}