linux-kernel - [PATCH 2/2] bfq: ignore oom_bfqq in bfq_check

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Message-Id: <20221108181030.1611703-2-khazhy@google.com>
Date:   Tue,  8 Nov 2022 10:10:30 -0800
From:   Khazhismel Kumykov <khazhy@...omium.org>
To:     Paolo Valente <paolo.valente@...aro.org>,
        Jens Axboe <axboe@...nel.dk>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Yu Kuai <yukuai1@...weicloud.com>, Jan Kara <jack@...e.cz>,
        Khazhismel Kumykov <khazhy@...gle.com>
Subject: [PATCH 2/2] bfq: ignore oom_bfqq in bfq_check_waker

oom_bfqq is just a fallback bfqq, so shouldn't be used with waker
detection.

Suggested-by: Jan Kara <jack@...e.cz>
Signed-off-by: Khazhismel Kumykov <khazhy@...gle.com>
---
 block/bfq-iosched.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index ca04ec868c40..267baf84870f 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -2135,7 +2135,9 @@ static void bfq_check_waker(struct bfq_data *bfqd, struct bfq_queue *bfqq,
 	if (!bfqd->last_completed_rq_bfqq ||
 	    bfqd->last_completed_rq_bfqq == bfqq ||
 	    bfq_bfqq_has_short_ttime(bfqq) ||
-	    now_ns - bfqd->last_completion >= 4 * NSEC_PER_MSEC)
+	    now_ns - bfqd->last_completion >= 4 * NSEC_PER_MSEC ||
+	    bfqd->last_completed_rq_bfqq == &bfqd->oom_bfqq ||
+	    bfqq == &bfqd->oom_bfqq)
 		return;
 
 	/*
-- 
2.38.1.431.g37b22c650d-goog