Re: [Xen-devel] [PATCH 3/4] x86/nmi: wait for all CPUs in check_nmi_watchdog()

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 14.05.14 at 14:58, <david.vrabel@xxxxxxxxxx> wrote:
> The counting of a CPUs NMIs in check_nmi_watchdog() is only reliable
> if all CPUs have been spinning for 5 or more ticks.  There may be
> delays in waking other CPUs from deep power states that can mean that
> when the counts are checked CPUs haven't run for long enough.

5 ticks ought to be a couple of orders of a magnitude longer than
the worst possible wakeup time. I.e. I don't buy this argument
without actual numbers to support it.

Jan


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