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This is a discussion of garbage collection of Unix domain sockets in the Linux kernel. (i.e. `AF_UNIX`, and btw, AF is short for "address family").

It is talking about replacing a classic mark/sweep collector for unix domain sockets by something based on Tarjan's Strongly Connected Components.

Thank you for the clarification. I guess authors these days assume they don't need to state the Unix flavour they're talking about.