linux-kernel - [PATCH v2 1/4] blk-iocost: disable writeback throttling

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Date:   Wed, 12 Oct 2022 17:40:32 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     tj@...nel.org, axboe@...nel.dk
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        yukuai3@...wei.com, yukuai1@...weicloud.com, yi.zhang@...wei.com,
        linan122@...wei.com
Subject: [PATCH v2 1/4] blk-iocost: disable writeback throttling

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

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>
---
 block/blk-iocost.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index 495396425bad..08036476e6fa 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -3264,9 +3264,11 @@ 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) {
-- 
2.31.1