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Trying to find out what changing the maximum possible CPU frequency when on battery power I realized that what I need is a tool that can monitor access to a particular file and log the PID of process that is making that access. It should work on virtual FS such as proc, otherwise it wouldn't be useful to me.

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Commands from the audit or the inotify-tools package can track file access. See my answer to a very similar question: Unix - Historically who all opened a particular file. Most answers on that question answer your question. I'd have considered this a dupe, but the OP seems to have had a different requirement in mind in asking that question.

Update: These commands might not work as you expect on /sys as it's a pseudo-filesystem.

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It works, thanks :) – vava Sep 5 '09 at 15:24
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lsof is what you are looking for.

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Not really, as a file I want to track access to is small, writing to it takes few milliseconds. I'm not sure lsof in repeat mode can catch it but I'll give it a try. – vava Sep 5 '09 at 14:51
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