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    SubjectRe: [RFC][PATCH 02/22] sched: add extended scheduling interface
    Il 10/11/2010 23:17, Raistlin ha scritto:
    >> I would suggest we add at least one more field so we can implement the
    >> stochastic model from UNC, sched_runtime_dev or sched_runtime_var or
    >> somesuch.
    > Do we need some further mechanism to grant its
    > extendability?
    > Padding?
    > Versioning?
    > void *data field?
    > Whatever?
    This is a key point. Let me copy text from a slide of my LPC main-conf talk:

    Warning: features & parameters may easily grow
    - Addition of parameters, such as
    - deadline
    - desired vs guaranteed runtime (for adaptive reservations &
    controlled overcommitment)
    - Set of flags for controlling variations on behavior
    - work conserving vs non-conserving reservations
    - what happens at fork() time
    - what happens on tasks death (automatic reclamation)
    - notifications from kernel (e.g., runtime exhaustion)
    - Controlled access to RT scheduling by unprivileged
    applications (e.g., per-user “quotas”)
    - Monitoring (e.g., residual runtime, available bandwidth)
    - Integration/interaction with power management
    (e.g., spec of per-cpu-frequency budget)

    How can we guarantee extensibility (or replacement) of parameters in the
    future ?

    What about something like _attr_*() in POSIX-like interfaces ?


    Tommaso Cucinotta, Computer Engineering PhD, Researcher
    ReTiS Lab, Scuola Superiore Sant'Anna, Pisa, Italy
    Tel +39 050 882 024, Fax +39 050 882 003

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