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SubjectRe: [PATCH v6 22/29] x86/watchdog/hardlockup: Add an HPET-based hardlockup detector
On Fri, May 13 2022 at 15:16, Ricardo Neri wrote:
> On Mon, May 09, 2022 at 04:03:39PM +0200, Thomas Gleixner wrote:
>> > + /* If we are here, IPI shorthands are enabled. */
>> > + apic->send_IPI_allbutself(NMI_VECTOR);
>> So if the monitored cpumask is a subset of online CPUs, which is the
>> case when isolation features are enabled, then you still send NMIs to
>> those isolated CPUs. I'm sure the isolation folks will be enthused.
> Yes, I acknowledged this limitation in the cover letter. I should also update
> Documentation/admin-guide/lockup-watchdogs.rst.
> This patchset proposes the HPET NMI watchdog as an opt-in feature.
> Perhaps the limitation might be mitigated by adding a check for non-housekeeping
> and non-monitored CPUs in exc_nmi(). However, that will not eliminate the
> problem of isolated CPUs also getting the NMI.

Right. It's a mess...

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