[libvirt-users] Monitor guest vm memory usage

[journey journey]

Thanks for your reply.
My qemu version is qemu-kvm-rhev-0.12.The key problem is, qemu-kvm process memory usage(RSS) always increases no matter how much memory used in guset vm.
for example, qemu-kvm process rss is 2.3g in host machine,  
but free output in vm shows only 151MB
My question is :
1. Why qemu-kvm doesn't release physical memory ?2. How to monitor real memory usage in guest vm? 
Sincerely.

    On Thursday, September 1, 2016 11:36 PM, Patrick PICHON <patrick at pichon.me> wrote:
 

 why not using collectd with the libvirt plugin on your host. It will 
colect the info, and then you just have to display with rrdtool


On , journey journey wrote:
> Hi All
> 
> Is there a tool to monitor qemu-kvm guest vm memory usage ( free in
> guest vm)?
> Nowadays, I have already researched some methods:
> 1. qemu-kvm process memory usage.
>      Since qemu-kvm process memory usage always increases as time goes
> on, it will not reflect the memory usage in vm.
> 2. virsh dommemstat
>      Just as method 1.
> 3. virsh qemu-monitor-command --hmp [domain name] "info mem"
>      (1) when guest vm memory size less than 4Gbytes, it will output
> something like this:
>            7f882000-7f883000 00001000 urw
>            7fbf8000-7fbf9000 00001000 urw
>            88000000-88001000 00001000 -rw
>            88002000-88003000 00001000 urw
>            88004000-88005000 00001000 urw
>            c9000000-c9001000 00001000 urw
>            e8bfe000-e8bff000 00001000 urw
>            ea000000-ea001000 00001000 urw
>            ffbfc000-ffbfd000 00001000 -rw
>            ffbfe000-ffbff000 00001000 urw
>            it shows pde info of PG_PRESENT_MASK, maybe has some
> relation with guest vm memory usage.
>      (2) when guest vm memory size larger than 4Gbytes, it will
> output noting.
> 
> Please help!!
> _______________________________________________
> libvirt-users mailing list
> libvirt-users at redhat.com
> https://www.redhat.com/mailman/listinfo/libvirt-users


   
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