Keeping track of file opening

Is there an extension or easy way to hack Emacs to keep track of all file open and file save operations? I looked at recentf, and it doesn't seem to work with multiple Emacs processes running in parallel.

BTW, I found a way to keep track of file save operations, using http://www.emacswiki.org/emacs/BackupEachSave

(add-to-list 'load-path "~/.emacs.d/")
(开发者_运维问答require 'backup-each-save)
(add-hook 'after-save-hook 'backup-each-save)
(setq backup-each-save-mirror-location "/usr/local/google/users/yaroslavvb/backups")

It saves backup on each save with timestamp in filename, so you can get list of all save operations by traversing backups tree

There are hooks for visiting and saving files. You can use those to create some kind of common tracking function if you know elisp:

http://www.gnu.org/s/emacs/manual/html_node/elisp/Standard-Hooks.html