* Re: [PATCH v4] Docs/admin-guide/cgroup-v2: document io.latency rotational vs non-rotational behavior
[not found] <20260728095707.2398498-1-cui.tao@linux.dev>
@ 2026-08-02 21:32 ` Tejun Heo
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From: Tejun Heo @ 2026-08-02 21:32 UTC (permalink / raw)
To: Tao Cui
Cc: hannes, mkoutny, corbet, skhan, josef, axboe, cgroups, linux-doc,
linux-block, linux-kernel, cuitao
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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
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2026-08-02 21:32 ` [PATCH v4] Docs/admin-guide/cgroup-v2: document io.latency rotational vs non-rotational behavior Tejun Heo
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