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Re: [Xen-devel] [BUG] xenstat_vcpu_ns returns invalid value


  • To: Richard Kojedzinszky <richard@xxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Thu, 9 Jan 2020 20:10:41 +0000
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  • Delivery-date: Thu, 09 Jan 2020 20:10:47 +0000
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On 09/01/2020 20:09, Richard Kojedzinszky wrote:
> 2020-01-09 20:50 időpontban Andrew Cooper ezt írta:
>> On 09/01/2020 19:40, Richard Kojedzinszky wrote:
>>> Dear Xen Devs,
>>>
>>> commit 2529c850ea48f036727ca2f148caed89391311b8 introduces the
>>> XEN_RUNSTATE_UPDATE marker bit, which is not handled in
>>> vcpu_runstate_get() in xen/common/schedule.c. Relevant code:
>>>
>>>     delta = NOW() - runstate->state_entry_time;
>>>     if ( delta > 0 )
>>>         runstate->time[runstate->state] += delta;
>>
>> That was found and fixed a while ago.  c/s f28c4c4c10 "sched: don't let
>> XEN_RUNSTATE_UPDATE leak into vcpu_runstate_get()".
>>
>> No changes in userspace should be necessary, although you might need to
>> pester your distro for backports.
>>
>> ~Andrew
>
> Hi,
>
> Thanks for the quick reply,
>
> Then, as it is just a leak, until a backport arrives to my distro, I
> can mask out that bit from the results with no other side-effects, am
> I right?

Yes - that should be safe.

~Andrew

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