Re: [RFC] CPU controllers?

[Sam Vilain <sam@vilain.net>]

Nick Piggin wrote:
>> The answer is quite simple, people who are consolidating systems and 
>> working with fewer, larger systems, want to mark processes, groups of 
>> processes or entire containers into CPU scheduling classes, then 
>> either fair balance between them, limit them or reserve them a 
>> portion of the CPU - depending on the user and what their 
>> requirements are. What is unclear about that?
>>
>
> It is unclear whether we should have hard limits, or just nice like
> priority levels. Whether virtualisation (+/- containers) could be a
> good solution, etc.

Look, that was actually answered in the paragraph you're responding to. 
Once again, give me a set of possible requirements and I'll find you a 
set of users that have them. I am finding this sub-thread quite redundant.

> If you want to *completely* isolate N groups of users, surely you
> have to use virtualisation, unless you are willing to isolate memory
> management, pagecache, slab caches, network and disk IO, etc.

No, you have to use separate hardware. Try to claim otherwise and you're 
glossing over the corner cases.

Sam.