| Message ID | 20190822152037.15413-3-paolo.valente@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | block, bfq: series of improvements and small fixes of the injection mechanism | expand |
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c index 5a2bbd8613a8..e114282204f6 100644 --- a/block/bfq-iosched.c +++ b/block/bfq-iosched.c @@ -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++; }
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. Signed-off-by: Paolo Valente <paolo.valente@linaro.org> --- block/bfq-iosched.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)