linux-kernel - Re: [v6 PATCH 0/2] hung_task: Provide runtime reset interface for hung task detector

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Message-ID: <446y53ztmkyw5pqp6klxwd74cvwbjoptzezurr6qxg46frieg3@mbwmglq2qth5>
Date: Thu, 15 Jan 2026 13:18:25 -0500
From: Aaron Tomlin <atomlin@...mlin.com>
To: Lance Yang <lance.yang@...ux.dev>
Cc: sean@...e.io, linux-kernel@...r.kernel.org, pmladek@...e.com, 
	gregkh@...uxfoundation.org, akpm@...ux-foundation.org, joel.granados@...nel.org, 
	mhiramat@...nel.org
Subject: Re: [v6 PATCH 0/2] hung_task: Provide runtime reset interface for
 hung task detector

On Thu, Jan 15, 2026 at 11:24:13AM +0800, Lance Yang wrote:
> IIUC, we should just do:
> - Patch 1: Full cmpxchg-based counting (Petr's POC), sysctl read-only
> - Patch 2: Add write handler for userspace reset
> 
> That way Patch 1 is the real logic change, and Patch 2 is just adding
> the userspace interface.

Hi Lance,

Thank you for your feedback.
If I am not mistaken, Joel suggested the following structure [1]:

    1. Create a preparatory patch to change the data type to atomic_long_t
    2. Introduce the required functionality to support a reset to "0"

[1]: https://lore.kernel.org/lkml/d4vx6k7d4tlagesq55yrbma26i2nyt4tpijkme6ckioeyfqfec@txrs27niaj2m/

Kind regards,
-- 
Aaron Tomlin

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