Re: [Xen-devel] [PATCH] Fix softlockup issue after vcpu hotplug

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 30/1/07 12:11 pm, "Tian, Kevin" <kevin.tian@xxxxxxxxx> wrote:

>> Presumably softlockup threads are killed and re-created when VCPUs
>> are
>> offlined and onlined. Perhaps the re-creation is taking a long time? But
> 
> That should not be the case, since the softlockup warning continues
> to jump out after cpu is brought online.

You are confusing the two parts of the softlockup mechanism. The thread is
responsible only for periodically touching the watchdog. The warning
mechanism is driven off the timer interrupt handler. So it is entirely
possible for warnings to appear when the thread does not exist (in fact, if
the thread does not exist then we *expect* warnings to appear!).

 -- Keir



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