From: Paolo Valente <paolo.valente@linaro.org>
Date: Fri, 22 Jan 2021 18:19:45 +0000 (+0100)
Subject: block, bfq: increase time window for waker detection
X-Git-Tag: v5.12-rc1~103^2~96
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=ab1fb47e33dc7754a7593181ffe0742c7105ea9a;p=users%2Fdwmw2%2Flinux.git

block, bfq: increase time window for waker detection

Tests on slower machines showed current window to be way too
small. This commit increases it.

Tested-by: Jan Kara <jack@suse.cz>
Signed-off-by: Paolo Valente <paolo.valente@linaro.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index fdc5e163b2fed..43e2c39cf7b5c 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -1931,7 +1931,7 @@ static void bfq_add_request(struct request *rq)
 		if (bfqd->last_completed_rq_bfqq &&
 		    !bfq_bfqq_has_short_ttime(bfqq) &&
 		    ktime_get_ns() - bfqd->last_completion <
-		    200 * NSEC_PER_USEC) {
+		    4 * NSEC_PER_MSEC) {
 			if (bfqd->last_completed_rq_bfqq != bfqq &&
 			    bfqd->last_completed_rq_bfqq !=
 			    bfqq->waker_bfqq) {