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    SubjectRe: Linux-2.5.17

    --On Tuesday, May 21, 2002 08:21:56 PM -0700 Linus Torvalds
    <torvalds@transmeta.com> wrote:

    > The problem is just finding a _good_ context to switch to. We can do this
    > two different ways:
    >
    > (...)
    >
    > - my preferred solution: speculatively find _some_ process (preferably
    > one that we are likely to schedule next), and use that process's
    > "active_mm" to do a "switch_mm()" into (and set that to "current->mm")
    >
    > The speculative thing has the problem of finding a good process, but I
    > would suggest something along the lines of:
    >
    > - take the first process in the run-queue on the current CPU.
    > - if there is no process on th erun-queue, take our parent

    What would be the incremental cost of just switching to init_mm? Granted,
    it's likely to require switching again when you schedule, but this is the
    exit path. It could be a fallback if nothing else looks good.

    Dave McCracken

    ======================================================================
    Dave McCracken IBM Linux Base Kernel Team 1-512-838-3059
    dmccr@us.ibm.com T/L 678-3059

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