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

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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