Re: [Xen-devel] [Xen-users] CPU steal counter broken

[Valentin Vidic <Valentin.Vidic@xxxxxxxxx>]

On Thu, Aug 31, 2017 at 05:31:28PM +0200, Valentin Vidic wrote:
> The following behavior of the steal counter is observed with
> Xen 4.8.1 in a guest running 4.9 kernel (Debian stretch):
> 
> $ while sleep 1; do head -1 /proc/stat; done
> cpu  1556 0 1429 314195002 5529 0 64 14370419283 0 0
> cpu  1556 0 1429 314195402 5529 0 64 3601506907 0 0
> cpu  1556 0 1429 314195802 5529 0 64 1833790429262 0 0
> cpu  1556 0 1429 314196203 5529 0 64 1821957766874 0 0
> cpu  1556 0 1429 314196603 5529 0 64 1810766851628 0 0
> cpu  1556 0 1429 314197002 5529 0 64 1792853828090 0 0
> 
> This was probably caused by live migrating this guest a
> few times.  Detailed description of the problem is here:
> 
> https://0xstubs.org/debugging-a-flaky-cpu-steal-time-counter-on-a-paravirtualized-xen-guest/

Is there some simple fix for the broken steal counter after
live migration that could be sent to Greg to include in the
4.9 LTS kernel?

-- 
Valentin

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