Re: RFC: multiple address spaces for one process

[Peter Chubb <peterc@gelato.unsw.edu.au>]

In LinuxOnLinux, the guest is just another linux process (or
rather, one per virtual CPU).  So what this patch does is allow such a
garden-variety process to have more than one address space and switch
between them.2

Essentially what I'm doing is treating the standard linux VM as a huge
software-loaded TLB.  When the guest gets a TLB miss, the VMM calls
mmap() to insert the translation.    Without the patch the address
space has to be remapped on every guest context switch.  The patch
adds address-space IDs to make that unnecessary.

What I'm wondering is if there are any *other* uses for this (not just
virtualisation).  I know qemu uses mmap() to create its address
spaces if CONFIG_SOFTMMU is not defined, and could thus benefit.

--
Dr Peter Chubb  http://www.gelato.unsw.edu.au  peterc AT gelato.unsw.edu.au
http://www.ertos.nicta.com.au           ERTOS within National ICT Australia

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