Re: [Xen-devel] [PATCHv2] x86: only check for two watchdog NMIs

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 01/02/16 17:09, David Vrabel wrote:
> Since the NMI handler can now recognize watchdog NMIs, make
> check_nmi_watchdog() only check for at least two watchdog NMIs.  This
> prevents false negatives caused by other processors (which may be
> being power managed by the BIOS) running at reduced clock frequencies.
>
> We check for more than one NMI since there are apparently systems
> where the NMI works only once.
>
> This will also slightly speed up boot times since we only wait the
> full 10 ticks if the NMI watchdog on one or more CPUs is not working.
>
> Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>

Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

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