Content here is by Michael Still, mikal@stillhq.com.
I spent much of yesterday playing with KSM (Kernel Shared Memory, or Kernel Samepage Merging depending on which universe you come from). Unix kernels store memory in “pages” which are moved in and out of memory as a single block. On most Linux architectures pages are 4,096 bytes long. KSM is a Linux Kernel feature…
George asks in the comments on my previous post about loop and nbd devices an interesting question about the behavior of this code on essex. I figured the question was worth bringing out into its own post so that its more visible. I’ve edited George’s question lightly so that this blog post flows reasonably. Can…