Re: processor affinity

[Nick Piggin]

Jeff V. Merkey wrote:
> Alan Cox wrote:
>
> > On Maw, 2004-09-28 at 17:02, Jeff V. Merkey wrote:
> >  
> >
> > > > > http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=/netahtml/search-bool.html&r=2&f=G&l=50&co1=AND&d=ptxt&s1=merkey.INZZ.&OS=IN/merkey&RS=IN/merkey 
> > > > >
> > > > >       
> > > >
> > > > Wow, I never knew about that.
> > > >
> > > > But guess who wrote the affinity system calls? :)
> > > >     
> >
> >
> >  
> >
> > > I wrote them first, and coined the term.   
> >
> >
> > Cute but GCOS3 had affinity syscalls for batch processing in the 1970's
> > and I don't believe it was original even then.
> >  
>
> Using them for Intel Cache affinity was new at the time.  Intel SMP 
> hardware was not readily available at the time and was in
> its infancy in 1993 when this was developed.

That is amazingly specific - I suppose using it for cache affinity on
earlier processors wouldn't count :)

Joking aside, this doesn't seem like it would apply to Linux's scheduler.
We don't use a global queue, and we don't implement hard affinities with
local queues, but with a specific bitmask of cpus.

Of course, I don't really have any idea how to interpret patents...
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/