Re: x86 question: Can a process have > 3GB memory?

[Martin J. Bligh]

>> Hey Cliff, we are planning to implement virtwin() if you remember that
>> from PTX.  AWE on NT was derived from the same work.  There should soon
>> be some discussion about it on [e-mail] or I can
>> give you some more data...
> 
> Please implement it in userspace, using large POSIX shared memory
> segments and mmaping / munmapping them as needed.
> 
> This seems like a special enough case to keep it out of the kernel
> entirely. If there's something not efficient enough we could work
> on optimising the whole mmap & munmap path...

How are you going to change the user page tables from userspace?
This mechanism would seem to need kernel support however you did it.

M.