setrlimit() extension suggestion

I'd like to suggest an extension to setrlimit() and getrlimit(). The resource
symbol would be RLIMIT_TIME (or RLIMIT_LINUX_TIME to designate an extension in
case a future POSIX change uses RLIMIT_TIME in an incompatible way). What it
should do is set a limit on "wallclock" time.

Is that something the kernel could do? It can already do RLIMIT_CPU but that
is not exactly the same.

Unreliable means exist now. One of them is a parent process that keeps time
and kills the child. But a child could "run away" fairly easily (fork and
change process group). A hard RLIMIT_TIME would be inescapable.

Discussion?

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