[$] Process-level kernel samepage merging control

The kernelsamepage merging (KSM) feature can save significant amounts of memorywith some types of workloads, but security concerns have greatly limitedits use. Even when KSM can be safely enabled, though, the control interfaceprovided by the kernel makes it unlikely that KSM actually will be used. Asmall patchseries from Stefan Roesch aims to change this situation by improvingand simplifying how KSM is managed.