Not all backups will trigger an atime update... backups based on
comparing dates (as
is the default in rsync, and quite typical in other backup utilities)
will not poison popularity contest
figures.
Kernel 2.6.20's innovation, the "relatime" flag, offers more trouble.
It will by default trigger a vote
the first time a package is used after installation, but not
thereafter. "nodiratime" may also pollute results.
I suspect "noatime" will become a far more common default in
distributions in the future, with the rise
of SSD's.
See also http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=87619
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