linux-kernel - [PATCH v3 12/14] bfq: disable merging between different groups under better

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Message-Id: <d31d9a4bc5705adc0b6669b48470fcaabf55074a.1616649216.git.brookxu@tencent.com>
Date:   Thu, 25 Mar 2021 14:57:56 +0800
From:   brookxu <brookxu.cn@...il.com>
To:     paolo.valente@...aro.org, axboe@...nel.dk, tj@...nel.org
Cc:     linux-block@...r.kernel.org, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 12/14] bfq: disable merging between different groups under better_fairness

From: Chunguang Xu <brookxu@...cent.com>

In order to better guarantee the Qos for each group, we do not
allow queues of different groups to be merged.

Signed-off-by: Chunguang Xu <brookxu@...cent.com>
---
 block/bfq-iosched.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index 5aa9c2c..f4a99f9 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -2665,6 +2665,9 @@ static bool bfq_may_be_close_cooperator(struct bfq_queue *bfqq,
 	if (!bfq_bfqq_sync(bfqq) || !bfq_bfqq_sync(new_bfqq))
 		return false;
 
+	if (!bfq_bfqq_may_inject(bfqq, new_bfqq))
+		return false;
+
 	return true;
 }
 
-- 
1.8.3.1