this post was submitted on 26 May 2025
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Linux
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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I think the trick might be that nothing is stopping you from using more than one 32-bit integer to represent addresses and the kernel maps memory for processes in the first place, so as long as each process individually can work within the 32-bit address space, it's possible for the kernel to allocate that extra memory to processes.
I do suppose on some level the architecture, as in the CPU and/or motherboard need to support retrieving memory using more than 32 bits of address space, which would also be what somebody else replied, and seems to be available since 1999 on both AMD and Intel.