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    SubjectRe: fairsched + O(1) process scheduler
    On Wed, Apr 02, 2003 at 05:10:27PM -0500, Robert Love wrote:
    > On Wed, 2003-04-02 at 17:07, Antonio Vargas wrote:
    >
    > > Hmmm, we had some way for executing code just after an interrupt,
    > > but outside interrupt scope... was it a bottom half? Can you
    > > point me to some place where it's done?
    >
    > Unfortunately uidhash_lock cannot be used from a bottom half either.
    >
    > You can push it into a work queue. See schedule_work() and the default
    > events queue.

    I'll take a look.

    > > Ok, I did know m68k can do it, but wasn't sure about all other arches :)
    >
    > Yep. Everyone architecture I know of - and certainly all that Linux
    > support - can do atomic read/writes to a word. Thinking about it, it
    > would be odd if not (two writes to a single word interleaving?). There
    > are places this assumption is used.
    >
    > Anything more complicated, of course, needs atomic operations or locks.

    "word == basic unit of transfer from/to memory" on your reasoning, I suppose.

    I'm coding this now, hope I can post a basic implementation.

    Greets, Antonio.
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