Re: [RFC V5 01/16] blk: make the whole blk_mq_submit_bio under q_usage_counter

[RFC V5 0/16] blk: blk-rq-qos framework refactor and cleanup · Wang Jianchao (Kuaishou) <hidden> · 2022-02-24
[RFC V5 01/16] blk: make the whole blk_mq_submit_bio under q_usage_counter · Wang Jianchao (Kuaishou) <hidden> · 2022-02-24
Re: [RFC V5 01/16] blk: make the whole blk_mq_submit_bio under q_usage_counter · Christoph Hellwig <hch@infradead.org> · 2022-02-24
Re: [RFC V5 01/16] blk: make the whole blk_mq_submit_bio under q_usage_counter · Wang Jianchao <hidden> · 2022-02-25
[RFC V5 02/16] blk/rq-qos: prepare to make blk-rq-qos pluggable · Wang Jianchao (Kuaishou) <hidden> · 2022-02-24
Re: [RFC V5 02/16] blk/rq-qos: prepare to make blk-rq-qos pluggable · Christoph Hellwig <hch@infradead.org> · 2022-02-24
Re: [RFC V5 02/16] blk/rq-qos: prepare to make blk-rq-qos pluggable · Tejun Heo <tj@kernel.org> · 2022-02-24
[RFC V5 03/16] blk-wbt: make wbt pluggable · Wang Jianchao (Kuaishou) <hidden> · 2022-02-24
[RFC V5 04/16] blk-iolatency: make iolatency pluggable · Wang Jianchao (Kuaishou) <hidden> · 2022-02-24
[RFC V5 05/16] blk-iocost: make iocost pluggable · Wang Jianchao (Kuaishou) <hidden> · 2022-02-24
[RFC V5 06/16] blk-ioprio: make ioprio pluggable · Wang Jianchao (Kuaishou) <hidden> · 2022-02-24
[RFC V5 07/16] blk/rq-qos: get rid of unused interfaces of rqos · Wang Jianchao (Kuaishou) <hidden> · 2022-02-24
[RFC V5 08/16] blk/rq-qos: export the sysfs for switching qos · Wang Jianchao (Kuaishou) <hidden> · 2022-02-24
[RFC V5 09/16] blk-wbt: show wbt_lat_us sysfs interface only when wbt is opened · Wang Jianchao (Kuaishou) <hidden> · 2022-02-24
[RFC V5 10/16] blk-wbt: get rid of wbt_enable/disable_default() · Wang Jianchao (Kuaishou) <hidden> · 2022-02-24
Re: [RFC V5 10/16] blk-wbt: get rid of wbt_enable/disable_default() · Christoph Hellwig <hch@infradead.org> · 2022-02-24
Re: [RFC V5 10/16] blk-wbt: get rid of wbt_enable/disable_default() · Tejun Heo <tj@kernel.org> · 2022-02-24
[RFC V5 11/16] blk/rq-qos: get rid of debugfs register in blk_mq_debugfs_register · Wang Jianchao (Kuaishou) <hidden> · 2022-02-24
[RFC V5 13/16] blk-wbt: move cache setting to rq_qos_setting_changed() · Wang Jianchao (Kuaishou) <hidden> · 2022-02-24
[RFC V5 12/16] blk/rq-qos: change queue_depth_changed to setting_changed · Wang Jianchao (Kuaishou) <hidden> · 2022-02-24
[RFC V5 14/16] blk-wbt: cleanup the blk-wbt.h · Wang Jianchao (Kuaishou) <hidden> · 2022-02-24
[RFC V5 15/16] blk/rq-qos: move the rqos debugfs code to blk-rq-qos.c · Wang Jianchao (Kuaishou) <hidden> · 2022-02-24
[RFC V5 16/16] blk/rq-qos: add config to control the whole blk-rq-qos framework · Wang Jianchao (Kuaishou) <hidden> · 2022-02-24
Re: [RFC V5 0/16] blk: blk-rq-qos framework refactor and cleanup · Christoph Hellwig <hch@infradead.org> · 2022-02-24

From: Christoph Hellwig <hch@infradead.org>
Date: 2022-02-24 13:38:10
Also in: lkml

On Thu, Feb 24, 2022 at 05:06:39PM +0800, Wang Jianchao (Kuaishou) wrote:

This is to protect the rqos list against the rqos open/close. We
need to drain all of the caller of blk_mq_submit_bio() before
we can operate the rqos list.

This means ever I/O now has to d an extra refcount roundtrip.

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