Re: [PATCH] clocksource: disable irq when holding watchdog_lock.

[Thomas Gleixner]

On Mon, Oct 16 2023 at 16:03, Paul E. McKenney wrote:
> On Mon, Oct 16, 2023 at 11:47:55PM +0200, Thomas Gleixner wrote:
>> That said, this whole clocksource watchdog mess wants a proper
>> overhaul. It has become a pile of warts and duct tape by now and after
>> staring at it long enough there is no real reason to run it in a timer
>> callback anymore. It just can move into delayed work and the whole
>> locking problem can be reduced to the clocksource_mutex and some well
>> thought out atomic operations to handle the mark unstable case. But
>> that's a different story and not relevant for curing the problem at
>> hand.
>
> Moving the code to delayed work seems quite reasonable.
>
> But Thomas, you do understand that the way things have been going for
> the clocksource watchdog, pushing it out to delayed work will no doubt
> add yet more hair on large busy systems, right?  Yeah, yeah, I know,
> delayed work shouldn't be any worse than ksoftirqd.  The key word of
> course being "shouldn't".  ;-)

Yes, I'm aware of that. I still think it's worth at least to try it.

Thanks,

        tglx