linux-kernel - [PATCH 06/20] block, bfq: correct interactive weight-raise check in bfq_set_budget

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Message-ID: <20221101093417.10540-7-shikemeng@huawei.com>
Date:   Tue, 1 Nov 2022 17:34:03 +0800
From:   Kemeng Shi <shikemeng@...wei.com>
To:     <paolo.valente@...aro.org>, <axboe@...nel.dk>
CC:     <linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <shikemeng@...wei.com>
Subject: [PATCH 06/20] block, bfq: correct interactive weight-raise check in bfq_set_budget_timeout

After weight-raise finished, bfqq->wr_coeff is reset to 1 while
bfqq->wr_cur_max_time may not be reset. For example,
Function bfq_update_bfqq_wr_on_rq_arrival will only reset wr_coeff to 1 if
bfqq is created in burst creation. Function bfq_set_budget_timeout will be
called when bfqq is selected while it's wr_cur_max_time is set and wr_coeff
is 1. Fix this by check wr_coeff > 1 before check wr_cur_max_time.

Signed-off-by: Kemeng Shi <shikemeng@...wei.com>
---
 block/bfq-iosched.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index f4b4ba05f804..20ae52882235 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -3271,7 +3271,8 @@ static void bfq_set_budget_timeout(struct bfq_data *bfqd,
 {
 	unsigned int timeout_coeff;
 
-	if (bfqq->wr_cur_max_time == bfqd->bfq_wr_rt_max_time)
+	if (bfqq->wr_coeff > 1 &&
+	    bfqq->wr_cur_max_time == bfqd->bfq_wr_rt_max_time)
 		timeout_coeff = 1;
 	else
 		timeout_coeff = bfqq->entity.weight / bfqq->entity.orig_weight;
-- 
2.30.0