linux-kernel - Re: [PATCH v4 0/3] selftests: cgroup: Enhance robustness with polling helpers

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Message-ID: <aS59Fjm1iL5U3-Fn@slm.duckdns.org>
Date: Mon, 1 Dec 2025 19:45:58 -1000
From: Tejun Heo <tj@...nel.org>
To: Guopeng Zhang <zhangguopeng@...inos.cn>
Cc: hannes@...xchg.org, mhocko@...nel.org, roman.gushchin@...ux.dev,
	shakeel.butt@...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 0/3] selftests: cgroup: Enhance robustness with
 polling helpers

On Mon, Nov 24, 2025 at 08:38:13PM +0800, Guopeng Zhang wrote:
> Hi all,
> 
> This patch series introduces improvements to the cgroup selftests by adding helper functions to better handle 
> asynchronous updates in cgroup statistics. These changes are especially useful for managing cgroup stats like 
> memory.stat and cgroup.stat, which can be affected by delays (e.g., RCPU callbacks and asynchronous rstat flushing).
> 
> v4:
>  - Patch 1/3: Adds the `cg_read_key_long_poll()` helper to poll cgroup keys with retries and configurable intervals.
>  - Patch 2/3: Updates `test_memcg_sock()` to use `cg_read_key_long_poll()` for handling delayed "sock" counter updates in memory.stat.
>  - Patch 3/3: Replaces `sleep` and retry logic in `test_kmem_dead_cgroups()` with `cg_read_key_long_poll()` for waiting on `nr_dying_descendants`.

Michal, if this looks good to you, I'll apply after the merge window.

Thanks.

-- 
tejun