Re: [Xen-devel] domains being migrated state message improvements

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2014-05-02 at 14:24 +0100, Andrew Cooper wrote:
> On 02/05/14 14:16, Stefan Parvu wrote:
> > Hi,
> >
> > Can anyone comment and consider improving the way Xen kernel reports
> > domains being migrated ? In short Im putting some load on 10-14 guests
> > and I want to monitor things from dom0 via xentop. Im seeing strange
> > things reported by xentop like '------'
> >
> > See entire thread here:
> > http://lists.xen.org/archives/html/xen-users/2014-05/msg00007.html
> >
> >
> > Would be useful to have a proper message reported by xl list and xentop
> > when domains are being migrated. Currently xentop and xl list reporting
> > things like:
> >
> > xentop:
> >
> >>       NAME  STATE   CPU(sec) CPU(%)    
> >>      c5932 ------       1066   53.1    
> >>      c5964 -----r       3439   50.7    
> >>      c6464 ------       1067   50.3    
> >>    deb7464 ------        630   52.1    
> >>   Domain-0 -----r      82853  111.5    
> >>      lobby ------       1380   52.2    
> >>      r5732 ------      12075   50.7    
> >>      r5764 -----r      24563   50.6    
> >>      s10u8 -----r       2647   47.6    
> >>     sdrcom -----r       1015   52.7    
> >>     sdrorg --b---        154    0.0    
> >>    u100432 ------        961   50.9    
> >>    u100464 -----r        978   52.2    
> >>    u120464 ------        969   52.7    
> >>     win764 -----r       1328   72.7  
> >
> > xl list:
> >
> > Name                   ID   Mem VCPUs   State   Time(s)
> > Domain-0               0  6500     2     r-----   87994.3
> > c5932                  1  1024     1     r-----    8998.7
> > c5964                  2  1024     1     ------    6786.1
> > c6464                  3  1024     1     r-----    1896.2
> > deb7464                4  1024     1     ------     792.3
> > lobby                  5   756     1     ------    2403.7
> > r5732                  6  1019     1     r-----   27343.8
> > r5764                  7  1019     1     ------   27140.4
> > s10u8                  8  1019     1     r-----    3583.6
> > sdrcom                 9   768     1     r-----    1852.4
> > sdrorg                 10   768     1     -b----     168.6     
> > u100432                11  1024     1     ------   15657.9     
> > u100464                12  1024     1     r-----    1805.2     
> > u120464                13  1024     1     r-----    1812.1     
> > win764                 15  1023     2     ------    3131.6  
> >
> >
> > Please consider enhancing the output and have proper logging of each domain 
> > for
> > different conditions. Output like '------' is confusing and does not 
> > describe
> > properly the things. Worse 3rd tools or consumers of xentop might break 
> > when receiving such output.  
> >
> > Thanks,
> >
> 
> I would agree that it is a little confusing.  '------' means runnable
> but not running, in this case due to vcpu over subscription.

Is that not "blocked"?

BTW, the "migration" referred to here is VCPU migration to another PCPU
rather than domain migration. (It came up because that's another one of
the VCPU pause flags alongside blocked et al)

> However, the information is stale by the time it is displayed.  It is
> not really appropriate to be consumed by anything other than an eyeball.

Agreed. And even if someone disagrees I think it is up to those tools to
accept whatever the output is, even if that includes "nonsensical"
results.

Ian.


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