[pve-devel] pve-manager : expose balloon to gui

[Alexandre DERUMIER]

I have just tried query-balloon, I got only the "actual" value and not the others. (tested with differents guests kernels)

I have ask the question to qemu mailing.


But it seem that free_mem, total_mem are the real stats counters from guest.

So we could easily set a balloon min value from free_mem by example. It should be 100% safe.


----- Mail original ----- 

De: "Alexandre DERUMIER" <aderumier at odiso.com> 
À: "Dietmar Maurer" <dietmar at proxmox.com> 
Cc: pve-devel at pve.proxmox.com 
Envoyé: Mercredi 5 Décembre 2012 14:16:41 
Objet: Re: [pve-devel] pve-manager : expose balloon to gui 

>>You already saw the patches on the qemu list to query free space with balloon driver? 
Oh, I don't know. is it possible ? 
>>Maybe we can use that somehow? 

maybe query-balloon ? 

I see : free_mem && total_mem . is it the guest total free_mem & total_mem ? 
I look at it. 

query-balloon 
------------- 

Show balloon information. 

Make an asynchronous request for balloon info. When the request completes a 
json-object will be returned containing the following data: 

- "actual": current balloon value in bytes (json-int) 
- "mem_swapped_in": Amount of memory swapped in bytes (json-int, optional) 
- "mem_swapped_out": Amount of memory swapped out in bytes (json-int, optional) 
- "major_page_faults": Number of major faults (json-int, optional) 
- "minor_page_faults": Number of minor faults (json-int, optional) 
- "free_mem": Total amount of free and unused memory in 
bytes (json-int, optional) 
- "total_mem": Total amount of available memory in bytes (json-int, optional) 

Example: 

-> { "execute": "query-balloon" } 
<- { 
"return":{ 
"actual":1073741824, 
"mem_swapped_in":0, 
"mem_swapped_out":0, 
"major_page_faults":142, 
"minor_page_faults":239245, 
"free_mem":1014185984, 
"total_mem":1044668416 
} 
} 

----- Mail original ----- 

De: "Dietmar Maurer" <dietmar at proxmox.com> 
À: "Alexandre DERUMIER" <aderumier at odiso.com> 
Cc: pve-devel at pve.proxmox.com 
Envoyé: Mercredi 5 Décembre 2012 13:08:21 
Objet: RE: [pve-devel] pve-manager : expose balloon to gui 

> >>You can easily crash your VM with this - I am quite unsure if I want that on 
> the GUI? 
> 
> Well, maybe can we set min value to something safe ? (as yes, setting it to 
> 16MB, and I'm pretty sure it'll crash ;) 
> 
> Or maybe an option to display on/off the balloon feature in gui ? (or 
> something like "expert mode" display for advanced features). 
> 
> 
> I really like to have it in gui, to dynamic size my guests memory,without using 
> monitor. 
> 
> (note that citrix xenserver expose it by default) 

You already saw the patches on the qemu list to query free space with balloon driver? 
Maybe we can use that somehow? 
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