From: Shakeel Butt <shakeel.butt@linux.dev>
To: Guopeng Zhang <zhangguopeng@kylinos.cn>
Cc: tj@kernel.org, hannes@cmpxchg.org, mhocko@kernel.org,
roman.gushchin@linux.dev, mkoutny@suse.com,
muchun.song@linux.dev, lance.yang@linux.dev, shuah@kernel.org,
linux-mm@kvack.org, linux-kselftest@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 1/3] selftests: cgroup: Add cg_read_key_long_poll() to poll a cgroup key with retries
Date: Tue, 2 Dec 2025 11:24:22 -0800 [thread overview]
Message-ID: <bqbyraqz6ztwxd5hysw4ufttbb3ev463su4wyhipsuvau5bw7n@gzxrmua2aldf> (raw)
In-Reply-To: <20251124123816.486164-2-zhangguopeng@kylinos.cn>
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@kylinos.cn>
> Suggested-by: Michal Koutný <mkoutny@suse.com>
Reviewed-by: Shakeel Butt <shakeel.butt@linux.dev>
next prev parent reply other threads:[~2025-12-02 19:24 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-24 12:38 [PATCH v4 0/3] selftests: cgroup: Enhance robustness with polling helpers Guopeng Zhang
2025-11-24 12:38 ` [PATCH v4 1/3] selftests: cgroup: Add cg_read_key_long_poll() to poll a cgroup key with retries Guopeng Zhang
2025-12-02 19:24 ` Shakeel Butt [this message]
2025-11-24 12:38 ` [PATCH v4 2/3] selftests: cgroup: make test_memcg_sock robust against delayed sock stats Guopeng Zhang
2025-11-27 10:55 ` Lance Yang
2025-11-27 11:18 ` Guopeng Zhang
2025-11-27 11:29 ` Lance Yang
2025-12-02 23:12 ` Shakeel Butt
2025-12-03 3:27 ` Guopeng Zhang
2025-11-24 12:38 ` [PATCH v4 3/3] selftests: cgroup: Replace sleep with cg_read_key_long_poll() for waiting on nr_dying_descendants Guopeng Zhang
2025-12-02 23:18 ` Shakeel Butt
2025-12-03 3:32 ` Guopeng Zhang
2025-12-02 5:45 ` [PATCH v4 0/3] selftests: cgroup: Enhance robustness with polling helpers Tejun Heo
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