Linus Torvalds <torvalds@xxxxxxxx> writes:
> NOTE! Every SINGLE one of those heuristics are just totally made up by
> yours truly, and have no testing behind them. They're more of the type
> "that sounds about right" than "this is how it must be". As mentioned,
> Nico has already been playing with the heuristics - but he wanted better
> packs, not better CPU usage, so he went the other way from what you would
> want to try..
I haven't looked at Nico's original or updated code closely at
all, but two things come to mind.
(1) if we could tell the particular data is intrinsically
diff_delta unfriendly and diff_delta would waste too much
time when tried to delta against almost _any_ other blob,
then it might help to give an interface in diff-delta.c for
the caller to check for such a blob without even trying
diff_delta.
(2) otherwise, if diff_delta could detect it would spend too
many cycles to finish its work for a particular input early
on, we might want it to bail out instead of trying a
complete job.
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