Re: [PATCH] hung_task: Increment the global counter immediately

[Lance Yang]

On 2026/2/7 04:54, Aaron Tomlin wrote:
> On Wed, Feb 04, 2026 at 10:05:49AM -0800, Andrew Morton wrote:
> > On Wed, 4 Feb 2026 12:04:54 +0100 Petr Mladek <pmladek@xxxxxxxx> wrote:
> >
> > > 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@xxxxxxxxx>
> > > Closes: https://lore.kernel.org/r/f239e00f-4282-408d-b172-0f9885f4b01b@xxxxxxxxx
> > > Signed-off-by: Petr Mladek <pmladek@xxxxxxxx>
> > > ---
> > > This is a followup patch for
> > > https://lore.kernel.org/r/20260125135848.3356585-1-atomlin@xxxxxxxxxxx
> > >
> > > Note that I could not use commit IDs because the original
> > > patchset is not in a stable tree yet. In fact, it seems
> > > that it is not even in linux-next at the moment.
> >
> > Yes, I've gone into "fixes and trivial stuff only" mode, as we're at -rc8.
> >
> > Aaron, please incorporate Petr's fix into v8 and resend towards the end
> > of the merge window?
> >
> > Thanks.
>
> Hi Andrew,
>
> Absolutely.

Don't forget to credit Petr - just saying :)