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Re: [Xen-devel] [PATCH 1/1] sched/cputime: do not decrease steal time after live migration on xen

To: Dongli Zhang <dongli.zhang@xxxxxxxxxx>
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Tue, 10 Oct 2017 13:58:54 +0200
Cc: xen.list@xxxxxxxxx, dario.faggioli@xxxxxxxxxx, bevan@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxx, mingo@xxxxxxxxxx, joao.m.martins@xxxxxxxxxx
Delivery-date: Tue, 10 Oct 2017 11:59:22 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

On Tue, Oct 10, 2017 at 05:14:08PM +0800, Dongli Zhang wrote:
> After guest live migration on xen, steal time in /proc/stat
> (cpustat[CPUTIME_STEAL]) might decrease because steal returned by
> paravirt_steal_clock() might be less than this_rq()->prev_steal_time.

So why not fix paravirt_steal_clock() to not be broken?

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References:
- [Xen-devel] [PATCH 1/1] sched/cputime: do not decrease steal time after live migration on xen
  - From: Dongli Zhang

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