Not all at one time, but you can map/unmap shared memory segments to
access more memory.
> What limits user space to 3GB.
Hardware limitations imposed by the x86 architecture. The x86 only has
_one_ virtual address space, which has to be shared by user space and
kernel space. It is not possible to give user space more virtual
address space without taking it away from the kernel.
> If not in current 2.4.x / 2.5.x, is this something planned in the future
> releases ?
Support for 64-bit processors like Intel Itanium and AMD Hammer
processors which do not have such limitations.
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