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From:   Paolo Valente <paolo.valente@linaro.org>
To:     Jens Axboe <axboe@kernel.dk>
Cc:     linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
        bfq-iosched@googlegroups.com, oleksandr@natalenko.name,
        patdung100@gmail.com, cevich@redhat.com,
        Paolo Valente <paolo.valente@linaro.org>
Subject: [PATCH BUGFIX 2/6] block, bfq: do not insert oom queue into position tree
Date:   Fri, 31 Jan 2020 10:24:05 +0100
Message-Id: <20200131092409.10867-3-paolo.valente@linaro.org>
In-Reply-To: <20200131092409.10867-1-paolo.valente@linaro.org>
References: <20200131092409.10867-1-paolo.valente@linaro.org>
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BFQ maintains an ordered list, implemented with an RB tree, of
head-request positions of non-empty bfq_queues. This position tree,
inherited from CFQ, is used to find bfq_queues that contain I/O close
to each other. BFQ merges these bfq_queues into a single shared queue,
if this boosts throughput on the device at hand.

There is however a special-purpose bfq_queue that does not participate
in queue merging, the oom bfq_queue. Yet, also this bfq_queue could be
wrongly added to the position tree. So bfqq_find_close() could return
the oom bfq_queue, which is a source of further troubles in an
out-of-memory situation. This commit prevents the oom bfq_queue from
being inserted into the position tree.

Tested-by: Patrick Dung <patdung100@gmail.com>
Signed-off-by: Paolo Valente <paolo.valente@linaro.org>
---
 block/bfq-iosched.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index 55d4328e7c12..15dfb0844644 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -613,6 +613,10 @@ bfq_pos_tree_add_move(struct bfq_data *bfqd, struct bfq_queue *bfqq)
 		bfqq->pos_root = NULL;
 	}
 
+	/* oom_bfqq does not participate in queue merging */
+	if (bfqq == &bfqd->oom_bfqq)
+		return;
+
 	/*
 	 * bfqq cannot be merged any longer (see comments in
 	 * bfq_setup_cooperator): no point in adding bfqq into the
-- 
2.20.1