From: Greg KH <greg@kroah.com>
To: Valentin Vidic <Valentin.Vidic@CARNet.hr>
Cc: stable@vger.kernel.org, Michael Lass <bevan@bi-co.net>
Subject: Re: Xen: decreasing cpu steal clock counter
Date: Thu, 31 Aug 2017 15:37:09 +0200 [thread overview]
Message-ID: <20170831133709.GD22739@kroah.com> (raw)
In-Reply-To: <20170831104451.e3ykmf66zbedg6iw@gavran.carpriv.carnet.hr>
On Thu, Aug 31, 2017 at 12:44:51PM +0200, Valentin Vidic wrote:
> The following behavior of the steal counter observed
> in a Xen guest running 4.9 kernel:
>
> $ 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
>
> Could this patch or some variation of it be included in
> the 4.9 LTS?
What patch?
> https://bugs.debian.org/cgi-bin/bugreport.cgi?att=1;bug=871608;filename=handle-decreasing-steal-clock.patch;msg=5
>
> Problem exists in versions 4.8 until 4.11 so older LTS
> kernels should not be affected.
>
> More details on this problem here:
>
> https://0xstubs.org/debugging-a-flaky-cpu-steal-time-counter-on-a-paravirtualized-xen-guest/
What is the git commit id of the aptch in Linus's tree that resolves
this issue?
thanks,
greg k-h
next prev parent reply other threads:[~2017-08-31 13:37 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-31 10:44 Xen: decreasing cpu steal clock counter Valentin Vidic
2017-08-31 13:37 ` Greg KH [this message]
2017-08-31 13:51 ` Valentin Vidic
2017-08-31 14:08 ` Greg KH
2017-08-31 15:05 ` Valentin Vidic
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