linux-kernel - Re: [PATCH 1/3] Range tree implementation

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Message-ID: <4F982424.9000603@linaro.org>
Date:	Wed, 25 Apr 2012 09:19:48 -0700
From:	John Stultz <john.stultz@...aro.org>
To:	Dmitry Adamushko <dmitry.adamushko@...il.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Android Kernel Team <kernel-team@...roid.com>,
	Robert Love <rlove@...gle.com>, Mel Gorman <mel@....ul.ie>,
	Hugh Dickins <hughd@...gle.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Rik van Riel <riel@...hat.com>,
	Dave Chinner <david@...morbit.com>, Neil Brown <neilb@...e.de>,
	Andrea Righi <andrea@...terlinux.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: [PATCH 1/3] Range tree implementation

On 04/25/2012 05:16 AM, Dmitry Adamushko wrote:
> Hi John,
>
> range_tree_in_range_adjacent() is not used in your code, and it
> doesn't seem to be very useful in general case. range_tree_in_range()
> can do the same thing (and you use it that way in the 2nd patch) and
> is more flexible (can be paired with range_tree_next_in_range()). So I
> think it can be dropped altogether.

Agreed. I actually at one point meant to do this and forgot. Thanks for 
pointing it out!

> Now, I'm wondering whether it actually makes sense to make a dedicated
> interface out of the remaining bits.
>
> Almost everything is common rb_tree-handling code that can be found in
> any place where rb-trees are used (hard-coded for flexibility,
> performance or whatever other reasons). So my feeling is that it
> should not be different here.
>
Sorry, not sure I quite understand what you're suggesting. Are you 
saying it doesn't make sense to have a generic range tree 
implementation, since really its just a small shim over the rbtree 
code?  So instead range-tree users should just implment them 
themselves?  Or something else?

thanks
-john

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