Hello,
Jarek Poplawski wrote:
> If we want to stick to more understanable, established ways,
> why don't we use a global lock (not per cpu but per work or
> per workqueue) for insert_work(), which would be really the
> simplest construct here. Probably because some compromise is
> needed. On the other hand many locks could be replaced with
> elaborate constructs with atomic operations like this. But
> for some reasons this usually isn't done.
>
> IMHO it's better to get used to barriers, because, as seen
> in this thread, even after finding better solution, the
> problem of execution ordering didn't disappear. Another
> "strange" question is: if these barriers are so tough, why
> Oleg managed to do them seemingly right from the very first
> time? But even if he would do some error here, I think it
> should be easier to check for this one problem only, than to
> risk the "stability" of the whole algorithm by changing more.
> Of course now, after the time was spent anyway, this new
> "old-way" is more attractive.
Well, it might be just because I'm used to what I call 'locked
enter/leave' model. If people don't find that easier to understand, no
objection from me and kudos to Oleg for getting it right from the beginning.
>> I think things can be made more similar to the locked enter/leave model
>> using the extra bit by putting manipulation and testing of the bit into
>> accesor functions, so readability was my primary concern not
>> performance. But, then again, we can probably make the barrier() model
>> readable enough too with proper accessor functions and plenty of
>> comments above them.
>
> Yes, the good thing is Oleg can choose between two good
> solutions here! (I don't envy him...)
As long as it's documented sufficiently, both are good. It's your
decision, Oleg. :-)
--
tejun
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