> >>> do you mean ZFOD?
> >>
> >> No, COW.
> >
> > i'm a bit puzzled.  how COW is invoked?
> > kernel text pages used to be registered to some vm object?
> 
> Yes, they used to be described in kernel_object.

a vm_map inserted by kmem_init() is changed to use kernel_object
at some point?

YAMAMOTO Takashi