From: Tejun Heo <tj@kernel.org>
To: Tao Cui <cui.tao@linux.dev>
Cc: hannes@cmpxchg.org, mkoutny@suse.com, corbet@lwn.net,
skhan@linuxfoundation.org, josef@toxicpanda.com, axboe@kernel.dk,
cgroups@vger.kernel.org, linux-doc@vger.kernel.org,
linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
cuitao@kylinos.cn
Subject: Re: [PATCH v4] Docs/admin-guide/cgroup-v2: document io.latency rotational vs non-rotational behavior
Date: Sun, 02 Aug 2026 11:32:49 -1000 [thread overview]
Message-ID: <14bd63f0e59ce815ec1a1d066f578aa0@kernel.org> (raw)
In-Reply-To: <20260728095707.2398498-1-cui.tao@linux.dev>
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On Tue, Jul 28, 2026 at 05:57:07PM +0800, Tao Cui wrote:
> io.latency is documented only in terms of average latency and the avg_lat
> stat, which matches rotational devices. On non-rotational devices a group
> misses its target once enough of the IOs in the window individually exceed
> it, and io.stat reports missed/total rather than avg_lat/win.
>
> Describe both cases: how a miss is detected, note that the avg_lat tuning
> guidance is rotational-only, and update the io.stat field list (mark
> avg_lat/win as rotational-only, document missed/total).
>
> Acked-by: Michal Koutný <mkoutny@suse.com>
> Signed-off-by: Tao Cui <cuitao@kylinos.cn>
Applied to cgroup/for-7.2-fixes.
Thanks.
--
tejun
prev parent reply other threads:[~2026-08-02 21:32 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-28 9:57 [PATCH v4] Docs/admin-guide/cgroup-v2: document io.latency rotational vs non-rotational behavior Tao Cui
2026-08-02 21:32 ` Tejun Heo [this message]
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