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    SubjectRe: [PATCH 6/7] containers (V7): BeanCounters over generic process containers
    On 2/13/07, Pavel Emelianov <xemul@sw.ru> wrote:
    > menage@google.com wrote:
    > > This patch implements the BeanCounter resource control abstraction
    > > over generic process containers. It contains the beancounter core
    > > code, plus the numfiles resource counter. It doesn't currently contain
    > > any of the memory tracking code or the code for switching beancounter
    > > context in interrupts.
    >
    > Numfiles is not the most interesting place in beancounters.
    > Kmemsize accounting is much more important actually.

    Right, but the memory accouting was a much bigger and more intrusive
    patch than I wanted to include as an example.

    >
    > I have already pointed out the fact that this place
    > will hurt performance too much. If we have some context
    > on task this context must
    > 1. be get-ed without any locking

    Would you also be happy with the restriction that a task couldn't be
    moved in/out of a beancounter container by any task other than itself?
    If so, the beancounter can_attach() method could simply return false
    if current != tsk, and then you'd not need to worry about locking in
    this situation.

    > 2. be settable to some temporary one without
    > locking as well

    I thought that we solved that problem by having a tmp_bc field in the
    task_struct that would take precedence over the main bc if it was
    non-null?

    Paul
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