[virt-tools-list] Virt-top --script problem

Paolo Bonzini bonzini at gnu.org
Thu Nov 18 12:48:06 UTC 2010

On 11/18/2010 01:03 PM, Richard W.M. Jones wrote:
> On Thu, Nov 18, 2010 at 12:13:22PM +0100, Paolo Bonzini wrote:
>> On 11/18/2010 10:56 AM, Richard W.M. Jones wrote:
>>>>>         snprintf (path, sizeof path,
>>>>>   -              "/sys/devices/xen-backend/tap-%d-%d/statistics/%s",
>>>>>   +              "/sys/devices/tap-%d-%d/statistics/%s",
>>>>>                   domid, device, str);
>>>>>         r = read_stat (path);
>>>>>         return r;
>>>>>   ----------------------------------------------------------------------
>>> Paolo, is there a correct location for these statistics directories?
>>> (It would have to work on RHEL 5 as well as upstream Xen).

It's really sysfs changes, not Xen changes.  Probably what you have now 
wouldn't work in the Novell forward-ported 2.6.32 dom0 kernel, too.

>> You could try /sys/bus/xen-backend/devices/*.  Hui, do you have that
>> directory?
> Is one of these paths the correct one that we should be using,
> or should we be searching for all three?

/sys/bus/xen-backend/devices/* is a symlink in RHEL5 to where you're 
searching now, but it is a "real" directory in newer Linux versions (I'm 
using F14).  So, the possibilities are:

- Hui reports that /sys/bus/xen-backend/devices works for him.  In that 
case, it is the correct one;

- it doesn't work for him, in that case adding the directory I suggested 
is pointless, you can just add the one that works for him.


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