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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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