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



On Wed, Apr 28, 2010 at 8:19 PM, Kumar L Srikanth-B22348
<B22348 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 redhat com]
> Sent: Wednesday, April 28, 2010 4:46 PM
> To: Kumar L Srikanth-B22348
> Cc: libvir-list 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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