[libvirt] 'dommemstat' is not working for LXC hypervisor.

Ryota Ozaki ozaki.ryota at gmail.com
Thu Apr 29 12:19:34 UTC 2010


On Thu, Apr 29, 2010 at 9:14 PM, Kumar L Srikanth-B22348
<B22348 at freescale.com> wrote:
> Thanks ozaki.
> But can you please elaborate the process of getting memory.stat of a particular domain?
> I mounted cgroup filesystem prior to start libvirtd service using the below command:
> mount -t cgroup cgroup /cgroup
>
> Then started libvirtd service.
> Then started the domain.
>
> Here, can you let me know the process of viewing memory stats of that particular domain?

Could you check output of dominfo again. Cannot you get proper 'Used memory'?

> By the way, in the /cgroup directory lot of files are created. In those, which one can be memory stats?

/cgroup/memory.stat is.

  ozaki-r

>
> Regards,
> Srikanth.
>
> -----Original Message-----
> From: Ryota Ozaki [mailto:ozaki.ryota at gmail.com]
> Sent: Thursday, April 29, 2010 5:27 PM
> To: Kumar L Srikanth-B22348
> Cc: Daniel P. Berrange; libvirt list; Ryota OZAKI
> Subject: Re: [libvirt] 'dommemstat' is not working for LXC hypervisor.
>
> On Wed, Apr 28, 2010 at 8:19 PM, Kumar L Srikanth-B22348 <B22348 at freescale.com> wrote:
>> Daniel,
>> My requirement is to get how much memory is free in the guest domain.
>> Can you please let me know, how can I do that?
>
> Do you enable cgroup memory subsystem? If so, something wrong in lxc driver of 0.8.0.
>
> BTW, 'Used memory' includes both RSS and caches, so if you need total-RSS value, you should use dommemstat.
>
>> And also, as you said it's quite easy to implement dommemstats for lxc
>> driver, is there any possibility to implement that?
>
> We can get statistics of dommemstat easily through memory.stat of cgroup.memory subsystem except statistics of page faults.
>
>  ozaki-r
>
>>
>> Regards,
>> Srikanth.
>>
>> -----Original Message-----
>> From: Daniel P. Berrange [mailto:berrange at redhat.com]
>> Sent: Wednesday, April 28, 2010 4:46 PM
>> To: Kumar L Srikanth-B22348
>> Cc: libvir-list at redhat.com
>> Subject: Re: 'dommemstat' is not working for LXC hypervisor.
>>
>> On Wed, Apr 28, 2010 at 04:43:41PM +0530, Kumar L Srikanth-B22348 wrote:
>>> Thanks for the reply Daniel.
>>> Virsh dominfo dommand showing following results:
>>>
>>> Id:             32473
>>> Name:           vm1
>>> UUID:           f13bc513-15f2-1dd1-74f6-18c47931ece9
>>> OS Type:        exe
>>> State:          running
>>> CPU(s):         1
>>> Max memory:     5000000 kB
>>> Used memory:    5000000 kB
>>> Autostart:      disable
>>>
>>>
>>> Though whatever services running on the domain, every time used
>>> memory
>>
>>> is showing as 5000000 kB. Is that result is correct?
>>
>> The 'Max memory' 5000000 KB is the hard limit that is allocated to the
>> container. I thought that the 'used memory' field would be lower, but
>> its possible we don't have the actual stats for used memory so just
>> set both the same. I'd have to research the code again to answer for sure...
>>
>> Daniel
>> --
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>
>




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