blk-iocost: disable writeback throttling

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@huawei.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20221012094035.390056-2-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index 4953964..0803647 100644 (file)
--- 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) {