Re: [Xen-devel] Serious issues with xenpaging

[Andres Lagar-Cavilla <andreslc@xxxxxxxxxxxxxx>]

On Jan 3, 2014, at 3:31 PM, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> 
wrote:

> On Fri, Jan 03, 2014 at 02:51:14PM -0500, Andres Lagar-Cavilla wrote:
>> On Jan 3, 2014, at 1:41 PM, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> 
>> wrote:
>> 
>>> On Fri, Jan 03, 2014 at 09:49:36AM -0500, Andres Lagar-Cavilla wrote:
>>>> 
>>>> On Dec 31, 2013, at 11:31 AM, Tim Deegan <tim@xxxxxxx> wrote:
>>>> 
>>>>> At 10:33 -0500 on 31 Dec (1388482410), Konrad Rzeszutek Wilk wrote:
>>>>>> On Mon, Dec 23, 2013 at 06:34:55PM +0000, Russell Pavlicek wrote:
>>>>>>> On Twitter, Florian Heigl sent a out a few messages about issues with 
>>>>>>> xenpaging:
>>>>>>> 
>>>>>>> ---
>>>>>>> 19-Dec: Anyone successfully use 
>>>>>>> #xen<https://twitter.com/search?q=%23xen&src=hash> 
>>>>>>> #xenpaging<https://twitter.com/search?q=%23xenpaging&src=hash>? docs 
>>>>>>> are at SLES manual, rest is mostly this: 
>>>>>>> http://www.gossamer-threads.com/lists/xen/devel/255798<http://t.co/P36VdL84Et>
>>>>>>>  dead feature or usable?
>>>>>>> 
>>>>>>> 22-Dec: @lars_kurth<https://twitter.com/lars_kurth> 
>>>>>>> @RCPavlicek<https://twitter.com/RCPavlicek> Hey guys, I wrote down as 
>>>>>>> much as I could https://piratenpad.de/p/Ik3lOBLniq1L5TEM   
>>>>>>> <https://t.co/e5LQCUD9d0> (since I'm on holiday and not constant online)
>>>>>>> 
>>>>>>> 22-Dec: Yay, tested #xen<https://twitter.com/search?q=%23xen&src=hash> 
>>>>>>> Xenpaging (memory overcommit)
>>>>>>> [x] largely untested
>>>>>>> [x] docs outdated
>>>>>>> [x] syntax+logic changed
>>>>>>> [x] broken
>>>>>>> ---
>>>>>>> 
>>>>>>> [I've taken the liberty of removing the colorful expletive from the 
>>>>>>> final post]
>>>>>>> 
>>>>>>> Is Florian's assessment correct, or is there somewhere we can point him 
>>>>>>> for help?  I'm on vacation this week, but if someone replies to me, I 
>>>>>>> will try to forward the information appropriately.
>>>>>> 
>>>>>> The Maintainers file implies otherwise. Let me CC the maintainers.
>>>>> 
>>>>> Andres really owns this code, so I'll punt to him for an official
>>>>> answer, but:
>>>> The part actively maintained is the hypervisor support for paging, and the 
>>>> interface.
>>>> 
>>>> tools/xenpaging is one way to consume that interface. It seems to have 
>>>> suffered from bitrot.
>>> 
>>> What is the other interface? Thanks!
>> 
>> Not sure what the question is. There is one interface. What I was referring 
>> to, is that tools/xenpaging implements one specific paging policy: victim 
>> selection, rate limiting, paging target, all of these are algorithms that 
>> entirely define what bang for your money you will get.
>> 
> 
> Right, but there is other code that uses this interface as well correct?
> Is it available for users ?

That I know of, Gridcentric's product. It's available as proprietary software 
for a fee. I am unaware of a sharing user other than Gridcentric. Virtuata was 
a mem-event user, Gridcentric is, and others have surfaced on the list (Razvan 
Cocajaru for instance).

Andres


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