Re: automatic memory ballooning?

[Avi Kivity <avi@redhat.com>]

On 08/16/2009 05:18 PM, Thomas Fjellstrom wrote:
> On Sun August 16 2009, Avi Kivity wrote:
>    
>> On 08/16/2009 12:55 PM, Thomas Fjellstrom wrote:
>>      
>>> I'm wondering if kvm supports automatic memory ballooning. I've had a kvm
>>> guest running for a couple days, and the balloon driver was loaded, and I
>>> could manually change the amount of ram it had allocated in the console,
>>> but it never seemed to change automatically.
>>>
>>> Is there any support for that?
>>>        
>> That would be part of a management application.  qemu only knows about
>> the guest it controls, while ballooning needs a global view of the system.
>>      
> All a single guest needs to do is only use as much ram as it needs at any
> given time (up to the max allocated). So if the guest hasn't used much ram in
> a given time frame, "free" the free ram from the host, and only reallocate
> when needed. It doesn't _need_ a management application, just happens to be
> the way people do it.
>    

Well, for a single guest you are correct, but this is better solved 
generically for multiple guests.

-- 
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