linux-kernel - Re: [PATCH v5 1/3] selftests: cgroup: Add cg_read_key_long

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Message-ID: <jp3gp3qbbqmq7nbn5i7qbsgxj3vwquibsxubvvkhc37p3pcc2m@24bljtuw6diy>
Date: Thu, 4 Dec 2025 16:04:30 +0100
From: Michal Koutný <mkoutny@...e.com>
To: Guopeng Zhang <zhangguopeng@...inos.cn>
Cc: tj@...nel.org, hannes@...xchg.org, shuah@...nel.org, 
	roman.gushchin@...ux.dev, lance.yang@...ux.dev, shakeel.butt@...ux.dev, 
	muchun.song@...ux.dev, linux-kselftest@...r.kernel.org, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/3] selftests: cgroup: Add cg_read_key_long_poll() to
 poll a cgroup key with retries

On Wed, Dec 03, 2025 at 07:56:29PM +0800, Guopeng Zhang <zhangguopeng@...inos.cn> 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>
> ---
>  .../selftests/cgroup/lib/cgroup_util.c        | 21 +++++++++++++++++++
>  .../cgroup/lib/include/cgroup_util.h          |  5 +++++
>  2 files changed, 26 insertions(+)

Acked-by: Michal Koutný <mkoutny@...e.com>

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