Re: large memory support for x86

From: Jonathan George (
Date: Thu Oct 12 2000 - 13:06:03 EST

>On Thu, 12 Oct 2000, Oliver Xymoron wrote:
>> On Wed, 11 Oct 2000, Kiril Vidimce wrote:
>> > My primary concern is whether a process can allocate more than 4 GB of
>> > memory, rather than just be able to use more than 4 GB of physical
>> > memory in the system.
>> Define allocate. There are tricks you can play, but userspace is still a
>> flat 32-bit address space per-process.
>Allocate = malloc(). The process needs to be able to operate on >4 GB
>chunks of memory. I understand that it's only a 32 bit address space
>which is why I was surprised when I read that Linux 2.4.x will support
>upwards of 64 GB's of memory.
>Thanks for all the responses.

You can, of course, bank switch memory by using a shared segment and cloning
additional process heaps. Obviously a _single_ 32bit address space can only
access 4GB at a time.


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