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!! ? ? ?? -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://listman.redhat.com/archives/libvirt-users/attachments/20160901/11aca212/attachment.htm>
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
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@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@redhat.com
> https://www.redhat.com/mailman/listinfo/libvirt-users