RE: [Xen-devel] cpuidle causing Dom0 soft lockups

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>>> "Tian, Kevin" <kevin.tian@xxxxxxxxx> 06.02.10 02:50 >>>
>>Next I'll do is try to detect when the duty CPU is de-scheduled, and
>>move on the duty to one that is scheduled (i.e. one that is currently
>>executing timer_interrupt()).
>>
>
>It's still possible that you move duty to one active CPU, while that
>active CPU is in stop_hz_timer with interrupt disabled. In that case,
>again no one is able to update jiffies and again stale jiffies can be
>observed... 

No, since the first thing a CPU entering stop_hz_timer() does is
relinquish the duty of updating jiffies.

Jan


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