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

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Message-ID: <6599ad830702121642w80c53ddud3c77c13af99d2b7@mail.gmail.com>
Date:	Mon, 12 Feb 2007 16:42:15 -0800
From:	"Paul Menage" <menage@...gle.com>
To:	"Sam Vilain" <sam@...ain.net>
Cc:	vatsa@...ibm.com, sekharan@...ibm.com,
	ckrm-tech@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	xemul@...ru, dev@...ru, rohitseth@...gle.com, pj@....com,
	ebiederm@...ssion.com, winget@...gle.com,
	containers@...ts.osdl.org, serue@...ibm.com
Subject: Re: [ckrm-tech] [PATCH 0/7] containers (V7): Generic Process Containers

On 2/12/07, Sam Vilain <sam@...ain.net> wrote:
> Ask yourself this - what do you need the container structure for so
> badly, that virtualising the individual resources does not provide for?

Primarily, that otherwise every module that wants to affect/monitor
behaviour of a group of associated processes has to implement its own
process grouping abstraction.

As an example, the CPU accounting patch that in included in my patch
set as an illustration of a simple resource monitoring module is just
250 lines, almost entirely in one file; if it also had to handle
associating tasks together into groups and presenting a filesystem
interface to the user it would be far larger and would have a much
bigger footprint on the kernel.

>From the point of view of the virtual server containers, the advantage
is that you're integrated with a standard filesystem interface for
determining group membership. It does become simpler to combine
virtual servers and resource controllers, although I grant you that
you could juggle that from userspace without the additional kernel
support.

Paul
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