Kernel Virtual Address Space

[Sridhar Chellappa]

Julian Elischer wrote:

>
>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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>>
Is it possible for freeBSD kernel threads to have their own private 
virtual address space ??