Marcus Brinkmann <[EMAIL PROTECTED]> wrote: > On Thu, Oct 28, 1999 at 12:58:10PM +0200, Gergely, Zsombor wrote: > > 2) You say it is good to put the servers in user space. Is it the same as > > user > > space vs. kernel space? If I understand well, the separation provides memory > > protection as well (crashes, garbage in memory). If yes, don't you loose > > something with not separating? > > Yes indeed. It user/kernel space with all protections you want in the user > level and no protection in the kernel level. I don understand your question, > though. What should we seperate?
I'd guess he's referring to the fact that kernel services run in a different address space from the processes that use them. This is the case with Hurd servers even more than with a monolithic kernel, because there are three address spaces involved in a typical system call - application, microkernel, and server. This three-way separation should provide even better protection from system crashes than the simple user/kernel model. -John
