how many lines of code is the linux kernel
Linux kernel Version 3.10 of the Linux kernel, released in June 2013, contains 15,803,499 lines of code,[26] while the version 4.1, released in June 2015, has grown to over 19.5 million lines of code contributed by almost 14,000 programmers.[27]
Linux kernel While Linus Torvalds supervises code changes and releases to the latest kernel versions, he has delegated the maintenance of older versions to other programmers.[142] Major releases as old as 2.0 (officially made obsolete with the kernel 2.2.0 release in January 1999) are maintained as needed, although at a very slow pace.
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Virtual address space For x86 CPUs, Linux 32-bit allows splitting the user and kernel address ranges in different ways: 3G/1G user/kernel (default), 1G/3G user/kernel or 2G/2G user/kernel.[9]