From: Lance Yang <lance.yang@linux.dev>
To: Aaron Tomlin <atomlin@atomlin.com>, pmladek@suse.com
Cc: neelx@suse.com, sean@ashe.io, mproche@gmail.com,
chjohnst@gmail.com, nick.lange@gmail.com,
linux-kernel@vger.kernel.org, gregkh@linuxfoundation.org,
mhiramat@kernel.org, akpm@linux-foundation.org,
joel.granados@kernel.org
Subject: Re: [PATCH v8 3/3] hung_task: Increment the global counter immediately
Date: Sun, 8 Feb 2026 12:13:13 +0800 [thread overview]
Message-ID: <97918424-6fc7-43a8-9301-20cc39573251@linux.dev> (raw)
In-Reply-To: <20260208002116.3790497-4-atomlin@atomlin.com>
On 2026/2/8 08:21, Aaron Tomlin wrote:
> From: Petr Mladek <pmladek@suse.com>
>
> A recent change allowed to reset the global counter of hung tasks using
> the sysctl interface. A potential race with the regular check has been
> solved by updating the global counter only once at the end of the check.
>
> However, the hung task check can take a significant amount of time,
> particularly when task information is being dumped to slow serial
> consoles. Some users monitor this global counter to trigger immediate
> migration of critical containers. Delaying the increment until the
> full check completes postpones these high-priority rescue operations.
>
> Update the global counter as soon as a hung task is detected. Since
> the value is read asynchronously, a relaxed atomic operation is
> sufficient.
>
> Reported-by: Lance Yang <lance.yang@linux.dev>
> Closes: https://lore.kernel.org/r/f239e00f-4282-408d-b172-0f9885f4b01b@linux.dev
> Reviewed-by: Aaron Tomlin <atomlin@atomlin.com>
> Signed-off-by: Petr Mladek <pmladek@suse.com>
> ---
Looks good to me, so:
Reviewed-by: Lance Yang <lance.yang@linux.dev>
next prev parent reply other threads:[~2026-02-08 4:13 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-08 0:21 [PATCH v8 0/3] hung_task: Provide runtime reset interface for hung task detector Aaron Tomlin
2026-02-08 0:21 ` [PATCH v8 1/3] hung_task: Refactor detection logic and atomicise detection count Aaron Tomlin
2026-02-08 0:21 ` [PATCH v8 2/3] hung_task: Enable runtime reset of hung_task_detect_count Aaron Tomlin
2026-02-20 7:06 ` Joel Granados
2026-03-02 22:30 ` Aaron Tomlin
2026-02-08 0:21 ` [PATCH v8 3/3] hung_task: Increment the global counter immediately Aaron Tomlin
2026-02-08 4:13 ` Lance Yang [this message]
2026-02-08 4:11 ` [PATCH v8 0/3] hung_task: Provide runtime reset interface for hung task detector Lance Yang
2026-02-08 4:19 ` Lance Yang
2026-02-08 19:49 ` Aaron Tomlin
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