It has been long established fact that Linux filesystems reserve the right to discard any and all file/directory updates prior to the last fsync(). However, with PMEM, where persisting data can be achieved with a handful of instructions, a system call, that takes several orders of magnitude more instructions, to persist data is untenable. This talk tells the story of the technical, practical, and interpersonal concerns of grabbing the 3rd rail of Linux filesystems and not only live to tell the tale, but succeed in delivering the full promise of PMEM programming to applications.