About once a year, the Linux Foundation analyzes the online repository that holds the source code of the kernel, or core, of the Linux operating system. As well as tracking the increasing complexity of the ever-evolving kernel over a series of releases from versions 3.0 to 3.10, the report also reveals who is contributing code, and the dominant role corporations now play in what began as an all-volunteer project in 1991.
While volunteer contributors still represent a plurality among developers, over 80 percent of code is contributed by people who are paid for their work. The Linux Foundation notes that contributions have been increasing from companies that make mobile and embedded systems, such as Linaro, Samsung, and Texas Instruments.