linux-kernel - Re: [PATCH v4 1/3] selftests: cgroup: Add cg_read_key_long

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Message-ID: <bqbyraqz6ztwxd5hysw4ufttbb3ev463su4wyhipsuvau5bw7n@gzxrmua2aldf>
Date: Tue, 2 Dec 2025 11:24:22 -0800
From: Shakeel Butt <shakeel.butt@...ux.dev>
To: Guopeng Zhang <zhangguopeng@...inos.cn>
Cc: tj@...nel.org, hannes@...xchg.org, mhocko@...nel.org, 
	roman.gushchin@...ux.dev, mkoutny@...e.com, muchun.song@...ux.dev, lance.yang@...ux.dev, 
	shuah@...nel.org, linux-mm@...ck.org, linux-kselftest@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/3] selftests: cgroup: Add cg_read_key_long_poll() to
 poll a cgroup key with retries

On Mon, Nov 24, 2025 at 08:38:14PM +0800, Guopeng Zhang wrote:
> Introduce a new helper function `cg_read_key_long_poll()` in cgroup_util.h.
> This function polls the specified key in a cgroup file until it matches the expected
> value or the retry limit is reached, with configurable wait intervals between retries.
> 
> This helper is particularly useful for handling asynchronously updated cgroup statistics
> (e.g., memory.stat), where immediate reads may observe stale values, especially on busy systems.
> It allows tests and other utilities to handle such cases more flexibly.
> 
> Signed-off-by: Guopeng Zhang <zhangguopeng@...inos.cn>
> Suggested-by: Michal Koutný <mkoutny@...e.com>

Reviewed-by: Shakeel Butt <shakeel.butt@...ux.dev>