[MERGE] Cache inventory.knit so we don't download it twice

[John Arbash Meinel]

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John Arbash Meinel wrote:
> Michael Ellerman wrote:
> 

...

> 
> Unfortunately because of how the content is walked, I believe we really
> *do* need to iterate in order.
> That iter_lines_added... has an api decision that we always walk the
> history in an explicit order. Otherwise when we annotate we can get
> different results. (If a line is repeated, it may match differently if
> history is sorted in a different order).
> 
> Attached is another possible patch, though. Basically, it still returns
> in requested order. Only now it only queues up items that were requested
> out of order. I use a similar trick for my readv() optimizations. And
> with readv() I found it worked quite well to keep the queue small.
> 
> I'm hoping to find something similar here.

It helps to actually attach the patch.

John
=:->
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