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    SubjectRe: [ckrm-tech] [PATCH 0/7] containers (V7): Generic Process Containers
    On 2/12/07, Sam Vilain <sam@vilain.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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