On Sun, 2002-06-16 at 20:24, Ingo Molnar wrote:
> On 16 Jun 2002, Robert Love wrote:
>
> > > +int idle_cpu(int cpu)
> > > +{
> > > + return cpu_curr(cpu) == cpu_rq(cpu)->idle;
> > > +}
> > > +
> >
> > I did not include this in my original O(1) backport update because
> > nothing in 2.4-ac seems to use it... so why include it?
>
> i have planned to submit the irqbalance patch for 2.4-ac real soon, which
> needs this function - current IRQ distribution on P4 SMP boxes is a
> showstopper.
Fair enough.
> > > - sched_setaffinity() & sched_getaffinity() syscalls on x86.
> >
> > Do we want to introduce this into 2.4 now? I realize 2.4-ac is not 2.4
> > proper, but if there is a chance this interface could change...
>
> the setaffinity()/getaffinity() interface looks pretty robust, i dont
> expect any changes - there's just so many ways to set an affinity mask for
> an opaque set of CPUs. And being able to set affinities is something that
> was frequently asked for by application developers.
I agree it seems robust and there have been no complaints, although
there could always be changes to the interface. Personally I'd like the
interfaces in 2.4/2.4-ac sooner rather than later too - I just want to
make sure we do not "etch it in stone" prematurely.
> IMO BUG_ON() is just an ugly way of doing an assert(), i dont like code
> with magic conditionals embedded within. But, the main reason was that
> 2.5-mainline has the code so that's being used.
Heh I like BUG_ON :-)
> like above, 2.5 is the reference base. Especially for 100% nonfunctional
> things like this it makes no sense to apply them to 2.4-ac only. But i
> agree that existing comment fixes should be forward ported into 2.5, i've
> applied them to my tree.
I agree the changes are nonfunctional and thus not a big deal...but I
didn't see a point in pushing erroneous changes onto 2.4-ac, whether
they are in 2.5 or not.
Although now it is all a moot point - Linus merged the patch I posted
earlier with the 2.4-ac bits against 2.5... so now a diff of 2.4-ac and
2.5 will be proper. ;-)
Robert Love
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