[Xen-devel] Xentop - Domain-0 statistics

[Kaushik Kumar Ram <kaushik@xxxxxxxx>]

Hi Folks,

Recently, I noticed that xentop stopped showing Domain-0's CPU utilization and 
other stats. 

First, is that the intended behavior for some reason? Assuming its not, am I 
the only one observing this issue?

I dug into the source code a bit and traced the problem to the 
xenstat_get_domain_name() function, which essentially finds the name of a 
domain by reading some values from xenstore.  But this function fails for 
Domain-0, and therefore xenstat_get_node() ignore Domain-0's stats.
In particular, "/local/domain/0/vm" does not exist for Domain-0 while it does 
for all other domains. 

I am not an expert on what/how values are stored in xenstore. But is there a 
reason why such a convoluted logic is used to determine a domain's name? Why 
not just read the value in "/local/domain/domain_id/name"?

I did exactly that and now I can see Domain-0's stats in xentop.

Is this a bug? If so, I can submit a patch.

Thanks.

--Kaushik
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