On Wed, 8 Aug 2001, craig wrote:
> In general a address in a process is just a linear address which refer
> to physical address indirectly by page directory. This is reasonable
> in user space. However is it necessary to do such thing in kernel? It
> is sure to have penalty when converting a linear address to physical
> thing. Is it worth doing such thing in kernel.
>
> I think the performance is the most important in kernel, other thing
> is second. I remember in linux linear address is real physical address
> in kernel space(is it true?). Why freebsd does not do in the same way?
To add a bit more..
the kernel uses 4MB of linear physical memory for it's text.
(this saves a lot of TLBs but still requires paging to be on.
>
>
> craiglei
>
>
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