Allocating dedicated RAM to host that guest can not use

Allocating dedicated RAM to host that guest can not use

[mad Engineer]

Hi,
    Is there any way to set some RAM dedicated to host that guest can
not access?
Similar to setting RAM to Dom0 in Xen.

I am over committing RAM for the instances but don't want host to swap.

i understand that virtual machines are process,but can we achieve this

Thanks

Re: Allocating dedicated RAM to host that guest can not use

[Wanpeng Li]

On Thu, Nov 27, 2014 at 05:12:52PM +0530, mad Engineer wrote:
>Hi,
>    Is there any way to set some RAM dedicated to host that guest can
>not access?
>Similar to setting RAM to Dom0 in Xen.
>
>I am over committing RAM for the instances but don't want host to swap.
>
>i understand that virtual machines are process,but can we achieve this

How about limit the memory of which guest can access through memory cgroup?

Regards,
Wanpeng Li 

>
>Thanks
>--
>To unsubscribe from this list: send the line "unsubscribe kvm" in
>the body of a message to majordomo@vger.kernel.org
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Re: Allocating dedicated RAM to host that guest can not use

[mad Engineer]

never tried that.
can we do that transparently ie with out setting cgroups for each
virtul machines?.
A global group such that all combined virtual machines RAM utilization
to be with in a specific value ?

On Thu, Nov 27, 2014 at 4:59 PM, Wanpeng Li <wanpeng.li@linux.intel.com> wrote:
> On Thu, Nov 27, 2014 at 05:12:52PM +0530, mad Engineer wrote:
>>Hi,
>>    Is there any way to set some RAM dedicated to host that guest can
>>not access?
>>Similar to setting RAM to Dom0 in Xen.
>>
>>I am over committing RAM for the instances but don't want host to swap.
>>
>>i understand that virtual machines are process,but can we achieve this
>
> How about limit the memory of which guest can access through memory cgroup?
>
> Regards,
> Wanpeng Li
>
>>
>>Thanks
>>--
>>To unsubscribe from this list: send the line "unsubscribe kvm" in
>>the body of a message to majordomo@vger.kernel.org
>>More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: Allocating dedicated RAM to host that guest can not use

[mad Engineer]

a random thought can we set qemu user/group rss to a particular hard
limit in limits.conf

Can this work?

On Thu, Nov 27, 2014 at 5:39 PM, mad Engineer <themadengin33r@gmail.com> wrote:
> never tried that.
> can we do that transparently ie with out setting cgroups for each
> virtul machines?.
> A global group such that all combined virtual machines RAM utilization
> to be with in a specific value ?
>
> On Thu, Nov 27, 2014 at 4:59 PM, Wanpeng Li <wanpeng.li@linux.intel.com> wrote:
>> On Thu, Nov 27, 2014 at 05:12:52PM +0530, mad Engineer wrote:
>>>Hi,
>>>    Is there any way to set some RAM dedicated to host that guest can
>>>not access?
>>>Similar to setting RAM to Dom0 in Xen.
>>>
>>>I am over committing RAM for the instances but don't want host to swap.
>>>
>>>i understand that virtual machines are process,but can we achieve this
>>
>> How about limit the memory of which guest can access through memory cgroup?
>>
>> Regards,
>> Wanpeng Li
>>
>>>
>>>Thanks
>>>--
>>>To unsubscribe from this list: send the line "unsubscribe kvm" in
>>>the body of a message to majordomo@vger.kernel.org
>>>More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: Allocating dedicated RAM to host that guest can not use

[Paolo Bonzini]

On 27/11/2014 13:16, mad Engineer wrote:
> a random thought can we set qemu user/group rss to a particular hard
> limit in limits.conf

Those apply per process, not per user/group.

Paolo