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    SubjectRe: [linux-pm] Re: Hibernation considerations
    Nigel Cunningham writes:

    > I guess I want to persist because all of these issues aren't utterly
    > unsolvable. It's just that we don't have the infrastructure yet to
    > figure out the solutions to these issues trivially. Take, for example,

    Ever heard of the halting problem? :) It's not just a matter of
    infrastructure. You very quickly get into questions that are
    mathematically undecideable.

    > the locking issue. If we could call some function to say "What process
    > holds this lock?", then task A could know that it's waiting on task B
    > and put that information somewhere. We could then use the information
    > to freeze task B before task A.

    But how would that help? If task B holds the lock, then we can't
    freeze it until it's released the lock. Then the question is, what
    does task B need in order to get to the point where it releases the
    lock? And so on. It rapidly gets not just extremely messy, but
    actually impossible to compute in general.

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      Last update: 2007-07-23 02:07    [W:0.026 / U:8.296 seconds]
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