Anatomy of Linux Kernel Shared Memory

Posted by solrac on Apr 16, 2010 10:04 PM EDT
IBM/developerWorks; By M. Tim Jones
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Software engineering tends to be an evolutionary process. Problems are addressed with solutions that can create new problems and subsequently new solutions. Ideally, the new problems that are created justify the original solution. The technology discussed here is one of the secondary solutions to a problem created by server virtualization. Before delving into KSM, however, let's take a quick look at the original solution and how KSM is applied here and elsewhere.

An interesting change in the 2.6.32 kernel is Kernel Shared Memory (KSM). KSM allows the hypervisor to increase the number of concurrent virtual machines by consolidating identical memory pages. Explore the ideas behind KSM (such as storage de-duplication), its implementation, and how you manage it.

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