Re: [PATCH] proxy memory objects

Marcus Brinkmann <[email protected]> writes:

> On Wed, Dec 11, 2002 at 09:55:35PM -0800, Thomas Bushnell, BSG wrote:
> > (Incidental question: why does vm_object_enter fail on a proxy?  I
> > would have expected it to hang when the call to memory_object_init
> > fails to get a proper response.  That is, it should see that this is
> > the first time the kernel has noticed this "pager", send
> > memory_object_init to it, and then do the vm_object_wait call looking
> > for VM_OBJECT_EVENT_INITIALIZED, which should never happen.)
> 
> Because of "po = ip_kotype(pager)", and we have a kotype for proxy objects,
> so the "if (po != IKOT_NONE) break;" hits ("bail if there is already a
> kobject associated with the pager port").  Later below, it is careful to
> only do stuff if it is really a VM object, which it isn't because it is an
> unhandled kernel object type.

Ah, so a real pager, which is just an ordinary mach port, isn't an
ikot at all, so you get IKOT_NONE.  So we never bother sending the
init request to the port and instead we notice that it's a kernel
object.

Cool.