Re: [PATCH -mm v2 04/11] rbtree: add helpers to find nearest unclenode

[Peter Zijlstra]

On Thu, 2012-06-21 at 17:57 -0400, Rik van Riel wrote:
> It is useful to search an augmented rbtree based on the augmented
> data, ie. not using the sort key as the primary search criterium.
> However, we may still need to limit our search to a sub-part of the
> whole tree, using the sort key as limiters where we can search.
> 
> In that case, we may need to stop searching in one part of the tree,
> and continue the search at the nearest (great-?)uncle node in a particular
> direction.
> 
> Add helper functions to find the nearest uncle node.

I don't think we need these at all, in fact, I cannot prove your lookup
function is O(log n) at all, since the uncle might not have a suitable
max gap size, so you might need to find yet another uncle etc.


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