mozilla/rr — pull request #708 by cgjones (2014-02-19 08:18:11+00:00)
Title: Patch the vdso __kernel_vsyscall() to jump into librrpreload.

This allows rr to buffer libc syscalls that originate at non-POSIX (or
implementation-specific, backwards-compatibility) symbols. Most
important among these is SYS_futex calls, which are the vast majority
of unbuffered FF syscalls.

Implementations of buffered syscalls in the new scheme will be added
one-by-one as their correctness is established.

@rocallahan you may want to look this one over too.