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
--
libvir-list mailing list
libvir-list@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/libvir-list