Re: [Xen-devel] [PATCH] xend: Fix xm list bug reporting incorrect memory size

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Fri, Apr 12, 2013 at 11:15:11AM -0400, Marcos E. Matsunaga wrote:
> Hi Ian,
> 
> Sorry, I thought I sent you the answer before, but it was stuck in
> my drafts folder for some reason.
> 
> I am not very familiar with xend either, but after reading the code,
> my understanding is that when a domain is being created, it keeps
> the domain paused until all the resources are allocated, then it
> unpause it to complete the boot. If I made a wrong assumption,
> please correct me.
> 
> If dominfo is called during the domain initialization process with
> update_mem = true (The default for update_mem is false), it will
> return zero as the resource is not allocated yet, and that will
> break the initialization process. Also, I don't think it would make
> sense to update memory information of a domain that is paused.
> 
> That's the relevance of the domain being paused.

ping? Should Marcos include this detail in the patch and repost it?
Thanks.
> 
> Regards,
> 
> Marcos Eduardo Matsunaga
> 
> Oracle USA
> Linux Engineering
> 
> âThe statements and opinions expressed here are my own and do not
> necessarily represent those of Oracle Corporation.â
> 
> On 04/08/2013 01:06 PM, Ian Jackson wrote:
> >Konrad Rzeszutek Wilk writes ("[Xen-devel] [PATCH] xend: Fix xm list bug 
> >reporting incorrect memory size"):
> >>From: Marcos Matsunaga<Marcos.Matsunaga@xxxxxxxxxx>
> >>
> >>Make sure memory is updated every time XendConfig.update is called.
> >>
> >>Without this patch, if a guest self-balloons, the amount of memory
> >>that 'xend' thinks the guest is using is based on last cached value.
> >>This means the reported value is nowhere close to what the real
> >>value is.
> >Err, right.  I'm afraid I'm very unfamiliar with the xend code so this
> >is going to take more explanation than usual.
> >
> >>-        self._dominfo_to_xapi(dominfo)
> >>+   if dominfo['paused']:
> >>+           self._dominfo_to_xapi(dominfo)
> >>+        else:
> >>+           self._dominfo_to_xapi(dominfo, update_mem = True)
> >Can you explain what the relevance is of the domain being paused ?
> >
> >Thanks,
> >Ian.
> 
> 
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