Commit 17c3d266 authored Aug 22, 2019 by Paolo Valente Committed by Jens Axboe Sep 17, 2019

block, bfq: increase update frequency of inject limit



The update period of the injection limit has been tentatively set to
100 ms, to reduce fluctuations. This value however proved to cause,
occasionally, the limit to be decremented for some bfq_queue only
after the queue underwent excessive injection for a lot of time. This
commit reduces the period to 10 ms.

Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Signed-off-by: Paolo Valente <paolo.valente@linaro.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

parent c1e0a182

block/bfq-iosched.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -2016,7 +2016,7 @@ static void bfq_add_request(struct request *rq)
		(bfqq->last_serv_time_ns > 0 &&
		bfqd->rqs_injected && bfqd->rq_in_driver > 0)) &&
		time_is_before_eq_jiffies(bfqq->decrease_time_jif +
		msecs_to_jiffies(100))) {
		msecs_to_jiffies(10))) {
		bfqd->last_empty_occupied_ns = ktime_get_ns();
		/*
		* Start the state machine for measuring the

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