Do let me know if it helped you in anyway. The relationships are shown by the lines and by clicking on any function, you’ll reach to its Linux source code and documentation.īrowse the entire interactive map here on MakeLinux.īelow is the image of the map for quick reference. On the map, there are more than 400 prominent functions and functions are divided into major subsystems. If addr is not NULL, then the kernel takes it as a hint about where to place the mapping on Linux, the kernel will pick a nearby page boundary (but always above or equal to the value specified by /proc/sys/vm/mmapminaddr) and attempt to create the mapping there. This is also very helpful to understand the subsystems. On current x8664 CPUs the memory will be laid out according to virtual memory map with 4 level page tables which is specified in the Linux kernel. A very helpful resource while designing drivers and system level applications without getting irritated trying to figure out what invokes what, which calls to make and using what parameters. The System.map is required when the address of a symbol name, or the symbol name of an address, is needed. A symbol name may be the name of a variable or the name of a function. A symbol table is a look-up between symbol names and their addresses in memory. This Linux kernel map helps greatly to understand complex interconnections between subsystems of the kernel while navigating through its source code. In Linux, the System.map file is a symbol table used by the kernel. Several of the map types exist to support specific BPF helpers that perform actions based on the map contents. There are several storage types available, including hash, array, bloom filter and radix-tree. It has helped me so far greatly whenever I wanted to dig deeper on Linux core architecture. BPF 'maps' provide generic storage of different types for sharing data between kernel and user space. Today, I found a great micro website that tries to explain the whole Linux Kernel in a single image put as an interactive map. It consists of multiple layers, modules, functionalities, calls and functions. Still, the core of the Linux kernel is a subject difficult to understand. There is tons of material available online. The Linux kernel is one of the most complex and popular open source projects. Internet runs on Linux, everybody knows this fact. The interactive Linux kernel map helps you traverse complex interconnections between subsystems of the kernel while you explore its source code.
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