Kernel Virtual Address Space

[Julian Elischer]

On Tue, 3 Feb 2004, Sridhar Chellappa wrote:

> Sridhar Chellappa wrote:
> 
> > As part of the Bootup sequence, I see create_pagetables allocate only 
> > 30 Pages for Page Table entries in non-PAE mode and 120 pages in PAE 
> > mode. Does this mean that all the kernel mode entities get only 4 * 30 
> > * 1024 * 1024 = 120 MB worth of Address Space ? Can I tune the kernel 
> > virtual address space by just changing the "NKPT" define in pmap.h ?
> >
> > Also, I heard that the BSD kernel(atleast from 5.1 onward) itself is 
> > pre-emptible and none of the kernel threads have a cpu affinity. How 
> > do I change the behaviour to make the kernel non-preemptible and tie 
> > kernel-threads to a particular CPU ?
> >
> > Sridhar.
> >
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> 
> Under Linux, all kernel threads share the same "Kernel" Virtual Address 
> Space. Is it the same under freeBSD ? If it is not, then what sort of 
> Stuff gets put into the "Kernel" Virtual Address Space?

The simple answer is: "yes they do".

> 
> 
> 
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