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Subject: Re: Re: [libvirt] How to get VM memory usage From: "wangyufeng@cloudguarding.com" <wangyufeng@cloudguarding.com> Date: 04/26/2017 01:21 AM

To: "Daniel P. Berrange" <berrange@redhat.com> CC: libvir-list <libvir-list@redhat.com>

Hi Daniel,

I found method MemoryStats in domain.go: func (d *Domain) MemoryStats(nrStats uint32, flags uint32) ([]DomainMemoryStat, error) { ptr := make([]C.virDomainMemoryStatStruct, nrStats)

result := C.virDomainMemoryStats( d.ptr, (C.virDomainMemoryStatPtr)(unsafe.Pointer(&ptr[0])), C.uint(nrStats), C.uint(flags))

if result == -1 { return []DomainMemoryStat{}, GetLastError() }

out := make([]DomainMemoryStat, result) for i := 0; i < int(result); i++ { out = append(out, DomainMemoryStat{ Tag: int32(ptr[i].tag), Val: uint64(ptr[i].val), }) } return out, nil }

Do you mean this method can get used memory info? While I invoke the method, which can only get values of tag 0 and tag 6:

And the balloon driver have been activated on the monitored vm:

Below is my code, could you tell me what's wrong with my code?

Thank you very much.

---------------------------------------------------------------------------------------------------------- On Fri, Apr 21, 2017 at 09:58:12AM +0800, wangyufeng@cloudguarding.com wrote:

...

Hi Daniel,

In method 'GetInfo', we can only get memory and max memory. However I need to get used memory for calculating memory usage. The virsh command 'dommemstat' can obtain used memory, is there a method in libvirt-go to obtain used memory?

That command uses the virDomainMemoryStats() API call

Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|

-- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3266 Virtualization: qemu.org | libvirt.org