Hardware topology

[Astrodog]

On 10/25/06, David Xu <davidxu at freebsd.org> wrote:
> On Wednesday 25 October 2006 05:50, rondzierwa at comcast.net wrote:
> > Does the amd64 kernel know anything about which memory is attached to
> > which processor, and which i/o bus is attached to which hypertransport
> > link? Can it use this information to do things like allocate pages to a
> > process from the memory that is physically attached to the cpu upon which
> > the process is running?  Along these lines, is there any way to set
> > affinity between a process and a cpu (or set of cpu's in the case of
> > multicore)?
> >
> > Likewise with i/o devices, if a process or device driver wants to operate a
> > particular device, can it be set to run on the cpu that owns the
> > hypertransport connection upon which the device is connected?
> >
> > thanks,
> > ron.
>
> There is no unique hardware topology structure in kernel,  but scheduler
> has some APIs can bind thread to a specific CPU, though there is no any
> syscall can let you do it.
>

I'm working on tying this into memory location. Currently slogging
through the VM side of things. I'm expecting some usable patches to
come out in the next month or so.