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    SubjectRe: [ckrm-tech] [PATCH] BC: resource beancounters (v4) (added user memory)
    On Tue, 2006-09-05 at 19:02 +0400, Kirill Korotaev wrote:
    > Core Resource Beancounters (BC) + kernel/user memory control.
    > BC allows to account and control consumption
    > of kernel resources used by group of processes.

    Hi Kirill,

    I've honestly lost track of these discussions along the way, so I hope
    you don't mind summarizing a bit.

    Do these patches help with accounting for anything other than memory?
    Will we need new user/kernel interfaces for cpu, i/o bandwidth, etc...?

    Have you given any thought to the possibility that a task might need to
    move between accounting contexts? That has certainly been a
    "requirement" pushed on to CKRM for a long time, and the need goes
    something like this:

    1. A system runs a web server, which services several virtual domains
    2. that web server receives a request for
    3. the web server switches into's accounting context
    4. the web server reads things from disk, allocates some memory, and
    makes a database request.
    5. the database receives the request, and switches into's
    accounting context, and charges for its resource use

    So, the goal is to run _one_ copy of an application on a system, but
    account for its resources in a much more fine-grained way than at the
    application level.

    I think we can probably use beancounters for this, if we do not worry
    about migrating _existing_ charges when we change accounting context.
    Does that make sense?

    -- Dave

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