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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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