CPU steal counter broken

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CPU steal counter broken

Valentin Vidic
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 already a patch for this issue that could be
proposed for the 4.9 LTS kernel?

--
Valentin

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