[$] Per-file OOM badness

The kernel tries hard to keep memory available for its present and futureneeds. Should that effort fail, though, the tool of last resort is thedreaded out-of-memory (OOM) killer, which is tasked with killing processeson the system to free their memory and alleviate the problem. The resultsof invoking the OOM killer are never going to be good, but they can bedistinctly worse if the wrong processes are chosen for an untimely end. Asone might expect, the effort to properly choose the right processes is anongoing effort. Most recently, ChristianKonig has proposed anew mechanism to address a blind spot in the OOM killer'sdeliberations.