It looks like an operation like "show me the history of mm/memory.c" will be pretty expensive using git.
Yes. Per-file history is expensive in git, because if the way it is indexed. Things are indexed by tree and by changeset, and there are no per-file indexes.
Although directory changes are tracked using change-sets, there seems to be no easy way to answer "give me the diff corresponding to
the commit (change-set) object <sha1>". That will be really helpful to
review the changes.
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