Date: Wed, 19 Mar 2008 08:26:16 +0100 From: Jeremie Le Hen <jeremie@le-hen.org> To: Jordan Gordeev <jgordeev@dir.bg> Cc: freebsd-hackers@freebsd.org, "Andrey V. Elsukov" <bu7cher@yandex.ru> Subject: Re: vkernel & GSoC, some questions Message-ID: <20080319072616.GB20579@obiwan.tataz.chchile.org> In-Reply-To: <47DCEBA1.8040503@dir.bg> References: <47DBC800.8030601@dir.bg> <160451205650165@webmail50.yandex.ru> <47DCEBA1.8040503@dir.bg>
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On Sun, Mar 16, 2008 at 11:42:57AM +0200, Jordan Gordeev wrote: > > 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. True, but ISTR that contrary to User-Mode Linux, the virtual memory operations are handled by the host kernel, which should increase speed. I have no pointer for this, I've got this information on #dragonflybsd. Regards, -- Jeremie Le Hen < jeremie at le-hen dot org >< ttz at chchile dot org >
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