The procmap utility

Visualizing the complete memory map of the kernel Virtual Address Space (VAS) as well as any given process's user VAS is what the procmap utility is designed to do.

The description on its GitHub page sums it up:

It outputs a simple visualization of the complete memory map of a given process in a vertically-tiled format ordered by descending virtual address. The script has the intelligence to show kernel and userspace mappings as well as calculate and show the sparse memory regions that will be present. Also, each segment or mapping is scaled by relative size (and color-coded for readability). On 64-bit systems, it also shows the so-called non-canonical sparse region or 'hole' (typically close to 16,384 PB on the x86_64).

The utility includes options to see only kernel space or userspace, verbose and debug modes, the ability to export its output in convenient CSV format to a specified file, as well as other options. It has a kernel component as well and currently works (and auto-detects) on x86_64, AArch32, and Aarch64 CPUs.

Do note, though, that I am still working on this utility; it's currently under development... there are several caveats. Feedback and contributions are most appreciated!

Download/clone it from https://github.com/kaiwan/procmap:

Figure 1.10 – A partial screenshot of the procmap utility's output, showing only the top portion of kernel VAS on x86_64

We make good use of this utility in Chapter 7, Memory Management Internals - Essentials.