linux-kernel - [PATCH 6.1 48/71] blk-iocost: disable writeback throttling

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Message-ID: <20240313163957.615276-49-sashal@kernel.org>
Date: Wed, 13 Mar 2024 12:39:34 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Yu Kuai <yukuai3@...wei.com>,
	Tejun Heo <tj@...nel.org>,
	Jens Axboe <axboe@...nel.dk>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.1 48/71] blk-iocost: disable writeback throttling

From: Yu Kuai <yukuai3@...wei.com>

[ Upstream commit 8796acbc9a0eceeddd99eaef833bdda1241d39b9 ]

Commit b5dc5d4d1f4f ("block,bfq: Disable writeback throttling") disable
wbt for bfq, because different write-throttling heuristics should not
work together.

For the same reason, wbt and iocost should not work together as well,
unless admin really want to do that, dispite that performance is
affected.

Signed-off-by: Yu Kuai <yukuai3@...wei.com>
Acked-by: Tejun Heo <tj@...nel.org>
Link: https://lore.kernel.org/r/20221012094035.390056-2-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Stable-dep-of: f814bdda774c ("blk-wbt: Fix detection of dirty-throttled tasks")
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 block/blk-iocost.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index e6557024e3da8..3788774a7b729 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -3281,9 +3281,11 @@ static ssize_t ioc_qos_write(struct kernfs_open_file *of, char *input,
 		blk_stat_enable_accounting(disk->queue);
 		blk_queue_flag_set(QUEUE_FLAG_RQ_ALLOC_TIME, disk->queue);
 		ioc->enabled = true;
+		wbt_disable_default(disk->queue);
 	} else {
 		blk_queue_flag_clear(QUEUE_FLAG_RQ_ALLOC_TIME, disk->queue);
 		ioc->enabled = false;
+		wbt_enable_default(disk->queue);
 	}
 
 	if (user) {
-- 
2.43.0