[libvirt] Libvirt's DomainGetInfo Function Development

[Aleem Akhtar]

Ok. So that's why I was getting 1 GB as a result.

So is there any way I can get memory in used programmatically?
I mean without going inside guest domain.
On Aug 5, 2016 5:42 PM, "Andrea Bolognani" <abologna at redhat.com> wrote:

> On Thu, 2016-08-04 at 20:02 +0500, Aleem Akhtar wrote:
> >
> > I am trying to get stats of Domains running under XEN hypervisor.
> > I used Libvirt function for this purpose. I am trying to understand
> > output for Memory. Domain running is Fedora-22 with 1GB Ram. Here is my
> > code
> >
> > y = virDomainGetInfo(allDomain, &info);
> > if (y == -1)
> >     printf("Errorl\n");
> > else {
> >     printf("Max Memory: %lu\n", info.maxMem);
> >     printf("Memory: %lu", info.memory);
> > }
> >
> > I get output as
> >
> > Max Memory: 1048576
> > Memory: 1048576
> >
> > Now, as per Libvirt API, info.memory should return the memory in KBytes
> > used by the domain. My Question is, if info.memory returns memory used
> > and my domain is using complete 100% of Max Memory or not? Also I tried
> > to create Domain with memory varying from 128MB to 2GB with same effect.
> > I also tried to run some applications in Domain but Memory usage return
> > by given function does not change. Any help or guidance will be much
> > appreciated.
>
> The relevant virDomainInfo field is described as
>
>   /* the memory in KBytes used by the domain */
>   unsigned long memory;
>
> but in this context, "used by" really means "available to".
>
> So the output above tells you that your Fedora guest has
> 1 GB of memory available; how much of that memory is actually
> being used by the guest OS is something that you can find out
> by running top inside the guest.
>
> --
> Andrea Bolognani / Red Hat / Virtualization
>
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