Linux creator Linus Torvalds officially released the Linux 4.0 kernel on April 12, marking the first major number change for Linux since Linux 3.0 debuted in 2011. Although a change in numbers can often signify a major software change, in Linux development the major version numbers are more of an arbitrary decision. Linux 4.0 does, however, include a number of new innovative capabilities, including a live kernel patching capability that could help further advance server high availability.
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