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SubjectRe: defrag deployment status (was Re: [PATCH] ext4: allow defrag (EXT4_IOC_MOVE_EXT) in 32bit compat mode)
Christian Borntraeger wrote:
> Some bigger things are missing in the e4defrag tool:
> ...
> - overall layout considerations (e.g. putting files close to its directory or
> use the atime to move often used files to the beginning of a disk etc.)

Shouldn't oft-used files be placed closer to the middle? If you place
them at the beginning of the file, it's only possible for the head-stack
to be close to the file from the inner direction. Place them in the
middle and it's possible for the head-stack to be close from the outer
direction, too, which sounds like a doubling of probability. It seems
that it's the least frequently used files that should be placed at one
end of the disk or the other.


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