Thanks for the information. It helps.
Sounds to me like, we can completely disable
preemption (time sharing feature) of lk 2.6 and then
lk 2.6 will act like lk 2.4?
How/where/when can we use:
preempt_disable()
preempt_enable()
get_cpu()
put_cpu()
on lk 2.6 to change it to a non-preemptive OS? Google
only gives me one search result for preempt_disable.
Thanks,
T
--- manish regmi <manish_regmi@hotmail.com> wrote:
>
> >Thanks for the information. It helps a lot!
> >
> >Just want to make sure I understand it. Could you
> >please confirm or correct me on the following two
> >questions:
> >
> >- on a lk2.4 uni-processor box. Can we say only
> one
> >function, which could be kernel's or my module's
> (my
> >module is part of kernel any way), can run at a
> time
> >and that function execution must complete before
> >another kernel function can be invoked, correct?
>
> Exactly,
>
> >- on a lk2.6 ("Preemptive kernel") uni-processor
> box,
> >kernel can switch back and forth between two kernel
> >function executions before they complete (i.e.
> using
> >time sharing), right?
>
> Yes,
> But not always. There are times where kernel
> premption is not possible. In
> places where preemption causes race conditions.
> preemption is disabled using
> preempt_disable()
> preempt_enable()
> get_cpu()
> put_cpu()
>
> regards manish
>
>
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