Whilst reading both https://lwn.net/Articles/391222/ and http://man7.org/linux/man-pages/man5/proc.5.html I have come across the terms oom_score and badness. Both numbers have the same basic meaning; the higher they are, the more likely the associated task is to be OOM-killed when the host is under memory pressure.
What is the relationship (if any) between the two numbers?
EDIT: My guess is oom_score = max(badness + oom_score_adj, 0) but I haven't found any proof
It looks like it is:
oom_score = badness * 1000 / totalpages
based on the kernel code https://github.com/torvalds/linux/blob/master/fs/proc/base.c#L549.
static int proc_oom_score(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task) { unsigned long totalpages = totalram_pages + total_swap_pages; unsigned long points = 0; points = oom_badness(task, NULL, NULL, totalpages) * 1000 / totalpages; seq_printf(m, "%lu\n", points); return 0; } 
/proc/[pid]/oom_score_adj section. I think in that description, the definition of badness is oom_score-oom_score_adj rather than the output of the badness function here