linux-kernel - Re: [PATCH 0/7] containers (V7): Generic Process Containers

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Date:	Wed, 21 Feb 2007 10:58:31 +1300
From:	Sam Vilain <sam@...ain.net>
To:	Paul Menage <menage@...gle.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>, akpm@...l.org,
	pj@....com, sekharan@...ibm.com, dev@...ru, xemul@...ru,
	serue@...ibm.com, vatsa@...ibm.com, containers@...ts.osdl.org,
	winget@...gle.com, rohitseth@...gle.com,
	ckrm-tech@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/7] containers (V7): Generic Process Containers

Paul Menage wrote:
>> Using the container name is bad and it led to this stupid argument.
>>
>> The fundamental unit of what we have merged into the kernel is the
>> namespace.  The aggregate of all namespaces and everything is the
>> container.
>>     
> What are you defining here as "everything"? If you mean "all things
> that could be applied to a segregated group of processes such as a
> virtual server",

The term "segregated group of processes" is too vague.  Segregated for
what?  What is the kernel supposed to do with this information?

> I guess what it comes down to, is why is an aggregation of namespaces
> suitable for the name "container", when an aggregation of namespaces
> and other resource controllers isn't?
>   

This argument goes away if you just rename these resource groups to
resource namespaces.

> What do you think might be a better name for the generic process
> groups that I'm pushing? As I said, I'm happy to do a simple
> search/replace on my code to give a different name if that turned out
> to be the gating factor to getting it merged. But I'd be inclined to
> leave that decision up to Andrew/Linus.
>   

Did you like the names I came up with in my original reply?

 - CPUset namespace for CPU partitioning
 - Resource namespaces:
   - cpusched namespace for CPU
   - ulimit namespace for memory
   - quota namespace for disk space
   - io namespace for disk activity
   - etc

>> For the case of namespaces I don't see how your code makes things
>> better.  I do not see a real problem that you are solving.
>>     
> I'm trying to solve the problem that lots of different folks
> (including us) are trying to do things that aggregate multiple process
> into some kind of constrained group, and are all trying to use
> different and incompatible ways of grouping/tracking those processes.
>   

Maybe what's missing is a set of helper macros/functions that assist
with writing new namespaces.  Perhaps you can give some more examples
and we can consider these on a case by case basis.

Sam.
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