Kernel sources
The official location for the Linux kernel is available at http://www.kernel.org, but there a lot of smaller communities that contribute to the Linux kernel with their features or even maintain their own versions.
Although the Linux core contains the scheduler, memory management, and other features, it is quite small in size. The extremely large number of device drivers, architectures and boards support together with filesystems, network protocols and all the other components were the ones that made the size of the Linux kernel really big. This can be seen by taking a look at the size of the directories of the Linux.
The Linux source code structure contains the following directories:
arch: This contains architecture-dependent code ...
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