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Re: Memory partitioning

On Tue, Aug 22, 2000 at 04:02:51PM +0530, Santosh Eraniose wrote:

> Is it possible to partition the MMU such that multiple OS
> can run on the same platform.
> In all examples I see like MKLinux , the mem mgmt of Linux is mapped to the
> underlying Mach kernel.
> The other extreme is as in RTAI (Real time App Interface), where the MMU is 
> handled by linux, but the
> scheduling is done by RTAI.

Several approaches:

 - IBM S390 can partition the hardware.  In cooperation with IBM's VM this
   allows to completly - and efficiently - subdivide the machine into multiple
   virtual machines.  VMs can even nest.
 - Less perfect due to not available VM-like software and no support of the
   hardware as on the S390 for example Sun's E10000 or SGI Origin 2000/3000
   offer partitioning.  This style of partitioning is mostly implemented
   by the hardware of the machines.

The two approaches guarantee that even a virtual machine or partition that goes nuts can't crash another virtual machine or partition.

 - Not implemented but in theory implementable would be multiple kernels
   running on top RTLinux's realtime kernel.

  Ralf
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