This week at LWN: Transcendent memory
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Making the best use of available memory is one of the biggest challenges for any operating system. Throwing virtualization into the mix adds both new challenges (balancing memory use between guests, for example) and opportunities (sharing pages between guests). Developers have responded with technologies like hot-plug memory and KSM, but nobody seems to think that the problem is fully solved. Transcendent memory is a new memory-management technique which, it is hoped, will improve the system's use of scarce RAM, regardless of whether virtualization is being used.
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