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To: Daniel Poelzleithner <poelzi@poelzi.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Suggestion: xtime as new inode attribute
References: <4B292D9A.5060501@poelzi.org>
From: Junio C Hamano <gitster@pobox.com>
Date: Fri, 18 Dec 2009 16:19:53 -0800
In-Reply-To: <4B292D9A.5060501@poelzi.org> (Daniel Poelzleithner's message of
 "Wed\, 16 Dec 2009 19\:57\:30 +0100")
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Daniel Poelzleithner <poelzi@poelzi.org> writes:

> I would like to suggest a new attribute for inodes in linux filesystems
> to record the last execution time of files.
>
> The problem:
>
> If a linux installation gets older and older, more and more programs get
> installed over time. Mostly to just test them for a particular problem
> and often the deinstallation is forgotten. To find out which packages
> are not used for a long time is currently quite impossible. The user may
> use program X which will run but not depend on program Y as a subprocess
> for example.
>
> The solution:
>
> I suggest a new inode attribute called xtime, which is like atime, but
> will only be updated when a file is executed. This would allow tracking
> of unused binaries and could be used with some clever algorithms in the
> cleanup program to find unused packages for removal or other cleanup
> purposes.

As I've never seen "cat /bin/sh" or similar done on an executable binary
by sane people, and I imagine that most sane back-up programs wouldn't
touch atime, I suspect that what you want to do can be done by checking
atime instead.
--
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