From: Tejun Heo <tj@kernel.org>
To: Tao Cui <cui.tao@linux.dev>
Cc: 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 v7 0/4] blk-iocost: BPF struct_ops cost model
Date: Tue, 29 Sep 2026 06:27:43 -1000 [thread overview]
Message-ID: <44f02289433805946d1e3272f626a925@kernel.org> (raw)
In-Reply-To: <4f1571a1-7e56-4264-aa7f-8dce32931ddb@linux.dev>
Hello, Tao.
On Tue, 29 Sep 2026 21:39:00 +0800, Tao Cui wrote:
> To make sure I understood correctly: attaching switches the active
> model to the attached BPF model, while model=linear and model=bpf
> only switch between the attached model and the builtin model without
> affecting the attachment itself. The attachment survives enable=0,
> and only .unreg removes it. Please shout if I still got that wrong.
Yes, except that removing the device also removes the attachment, as
ioc_rqos_exit() ejects the model.
Thanks.
--
tejun
next prev parent reply other threads:[~2026-09-29 16:27 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-24 5:45 [RFC PATCH v7 0/4] blk-iocost: BPF struct_ops cost model Tao Cui
2026-09-24 5:45 ` [RFC PATCH v7 1/4] blk-iocost: add BPF struct_ops cost model support Tao Cui
2026-09-24 6:00 ` sashiko-bot
2026-09-24 6:30 ` bot+bpf-ci
2026-09-29 0:42 ` Tejun Heo
2026-09-29 13:42 ` Tao Cui
2026-09-29 16:27 ` Tejun Heo
2026-09-30 4:14 ` Tao Cui
2026-09-24 5:45 ` [RFC PATCH v7 2/4] selftests/bpf: add iocost cost model test Tao Cui
2026-09-24 5:57 ` sashiko-bot
2026-09-24 6:30 ` bot+bpf-ci
2026-09-24 5:45 ` [RFC PATCH v7 3/4] blk-iocost: add iocost_ioc_tick tracepoint for per-period device summary Tao Cui
2026-09-24 6:17 ` bot+bpf-ci
2026-09-29 0:42 ` Tejun Heo
2026-09-29 13:46 ` Tao Cui
2026-09-24 5:45 ` [RFC PATCH v7 4/4] docs: cgroup-v2: document the iocost BPF cost model attachment Tao Cui
2026-09-29 0:42 ` [RFC PATCH v7 0/4] blk-iocost: BPF struct_ops cost model Tejun Heo
2026-09-29 13:39 ` Tao Cui
2026-09-29 16:27 ` Tejun Heo [this message]
2026-09-30 4:09 ` Tao Cui
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