Re: [Xen-devel] crash due to frequent access to csched_dom

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Thu, Jul 14, 2011 at 7:42 PM, David Xu <davidxu06@xxxxxxxxx> wrote:
> Sorry, I do not have the serial port device now. It seems I can not access
> to csched_dom struct frequently during scheduling tick. For example, in each
> schedule tick, I will adjust the runqueue sequence according to the latency
> (another parameter added by myself) and remained credits of each domainU.
> This part code is added to the csched_vcpu_acct() or csched_runq_sort(). I
> also try accessing to sdom->weight, it also does not work. OK, I will try to
> set up a serial console firstly. Thanks very much.

What's probably happening is that you're breaking invariants, and
hitting a "BUG_ON" or "ASSERT" somewhere else in the code.  While
you're getting your serial card set up, you could look at those
statements and see if your changes might be triggering any of them.

 -George

>
> Regards,
> Cong
>
> 2011/7/14 George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
>>
>> On Wed, Jul 13, 2011 at 5:54 PM, David Xu <davidxu06@xxxxxxxxx> wrote:
>> > Hi,
>> >
>> > I am changing the credit1 scheduler. But I encountered a problem that
>> > the
>> > system will crash if I use some fileds  of struct csched_dom (e.t.
>> > sdom->weight, sdom->credit ) frequently in the csched_vcpu_acct() or
>> > csched_runq_sort(). It seems strange. Can anyone give me some suggestion
>> > or
>> > share your experience? Thanks.
>>
>> Did you get any output on the serial console?
>>
>> If you don't have a serial console set up, that's the first thing to
>> do.  It's immensely helpful when doing Xen debugging, especially
>> scheduler stuff.
>>
>> You can learn more about setting up a Xen serial console here:
>>
>> http://wiki.xensource.com/xenwiki/XenSerialConsole
>>
>>  -George
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
>
>

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel