Re: I'm a total push-over..

> Linus Torvalds <torvalds@linux-foundation.org> writes:
> 
> > Basically, I dislike having two copies of the same data. If something 
> > can be computed from something else, then only the original data 
> > should exist, and the other thing should be recomputed.
> 
> Yes, I agree with that in principle. Storing computable values makes 
> sense only when it is expensive to recompute.  We did not have 
> cache-tree for quite a long time until you noticed that it was rather 
> expensive and wasteful to recompute tree objects from unchanged parts of 
> the index every time.
> 
> It's the same argument; when the hashing performance starts to become 
> noticeable, we can think about storing and reusing it, not before.