From: Tao Cui <cui.tao@linux.dev>
To: Tejun Heo <tj@kernel.org>
Cc: cui.tao@linux.dev, josef@toxicopanda.com, axboe@kernel.dk,
cgroups@vger.kernel.org, linux-block@vger.kernel.org,
linux-kernel@vger.kernel.org, bpf@vger.kernel.org,
andrii@kernel.org, eddyz87@gmail.com, ast@kernel.org,
daniel@iogearbox.net, linux-kselftest@vger.kernel.org,
Tao Cui <cuitao@kylinos.cn>,
ameryhung@gmail.com, alexei.starovoitov@gmail.com
Subject: Re: [RFC PATCH v8 4/4] docs: cgroup-v2: document the iocost BPF cost model attachment
Date: Fri, 2 Oct 2026 22:23:40 +0800 [thread overview]
Message-ID: <10da1f58-89f1-4b9f-bf96-b2ed4ddd69c7@linux.dev> (raw)
In-Reply-To: <95edaf582303f1a9404c989f9f0e6501@kernel.org>
Hello, Tejun.
在 2026/10/1 08:20, Tejun Heo 写道:
> Hello, Tao.
>
> The following is a Claude-generated review.
>
> On Wed, 30 Sep 2026 15:51:54 +0800, Tao Cui wrote:
>> + When CONFIG_BLK_CGROUP_IOCOST_BPF is enabled, a BPF cost model
>> + can be attached to a device by loading an "iocost_model_ops"
>> + struct_ops with the whole disk's major:minor in its "dev" member
> ...
>> + switches back to the builtin model, and neither detaches the
>> + struct_ops; only detaching removes the model, after which
>> + "model=bpf" fails. "ctrl" keeps describing the builtin
>
> Attaching, not loading, binds the model. The test loads a second model
> fine and only its attach fails. Device removal also removes the model,
> and the user still has to tear down the struct_ops link afterwards. Can
> you mention that too?
>
Done: the documentation now says attaching binds the model, that
removing the device ejects it as well, and that the user still has to
tear down the struct_ops link afterwards.
Thanks.
Tao
> Thanks.
>
> --
> tejun
prev parent reply other threads:[~2026-10-02 14:23 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-30 7:51 [RFC PATCH v8 0/4] blk-iocost: add BPF struct_ops cost model support Tao Cui
2026-09-30 7:51 ` [RFC PATCH v8 1/4] " Tao Cui
2026-09-30 8:11 ` sashiko-bot
2026-09-30 11:50 ` Tao Cui
2026-10-01 0:20 ` Tejun Heo
2026-10-02 14:17 ` Tao Cui
2026-09-30 7:51 ` [RFC PATCH v8 2/4] selftests/bpf: add iocost cost model test Tao Cui
2026-09-30 8:02 ` sashiko-bot
2026-10-01 0:20 ` Tejun Heo
2026-10-02 14:20 ` Tao Cui
2026-09-30 7:51 ` [RFC PATCH v8 3/4] blk-iocost: add iocost_ioc_tick tracepoint for per-period device summary Tao Cui
2026-10-01 0:20 ` Tejun Heo
2026-10-02 14:22 ` Tao Cui
2026-09-30 7:51 ` [RFC PATCH v8 4/4] docs: cgroup-v2: document the iocost BPF cost model attachment Tao Cui
2026-09-30 8:45 ` bot+bpf-ci
2026-10-01 0:20 ` Tejun Heo
2026-10-02 14:23 ` Tao Cui [this message]
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