pagemon: an ncurses based tool to monitor process memory

While developing stress-ng I wanted to be able to see if the various memory stressors were touching memory in the way I had anticipated. While digging around in the Linux documentation I discovered the very useful soft/dirty bit on Page Table Entries (PTEs) that get set when a page is written to. The mechanism to check for the soft/dirty bit is described in Documentation/vm/soft-dirty.txt; one n

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