Andrey V. Elsukov wrote:
>16.03.08, 09:30, "David O'Brien" <obrien@freebsd.org>:
>
>
>>> Add virtual kernel (vkernel) support to FreeBSD for the i386 and amd64
>>>architectures.
>>>
>>>The vkernel support in question is the one found in DragonFlyBSD.
>>>
>>>
>>Not being up on DragonFlyBSD, can you better describe what "vkernel" is?
>>
>>
>
>vkernel is similar to User Mode Linux technology. You can boot vkernel as a
>user mode process. I think it will be good to have similar in FreeBSD.
>There are several links:
>http://leaf.dragonflybsd.org/mailarchive/users/2007-01/msg00237.html
>http://www.dragonflybsd.org/docs/articles/vkernel/vkernel.shtml
>
>
>
The two links that Andrey posted are very good. I just want to add a
short summary:
A vkernel is a kernel running as a user process under a real kernel. The
vkernel runs in the CPU's priviledge ring 3. It services its child
processes like a normal kernel, but whenever a page table needs to be
modified, context switched, or some other privileged operation needs to
be executed, the vkernel asks the real kernel through a syscall interface.
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