linux-kernel - Re: [PATCH] Documentation: Update augmented rbtree documentation

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Date:	Mon, 16 May 2011 12:10:55 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Sasha Levin <levinsasha928@...il.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Woodhouse <David.Woodhouse@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] Documentation: Update augmented rbtree documentation

On Mon, 2011-05-16 at 12:56 +0300, Sasha Levin wrote:
> Current documentation referred to the old method
> of handling augmented trees. Update documentation
> to correspond with the changes done in commit
> b945d6b2554d550fe95caadc61e521c0ad71fb9c.
> 
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Pekka Enberg <penberg@...helsinki.fi>

Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>

> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: David Woodhouse <David.Woodhouse@...el.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Sasha Levin <levinsasha928@...il.com>
> ---
>  Documentation/rbtree.txt |   23 ++++++++++++++---------
>  1 files changed, 14 insertions(+), 9 deletions(-)
> 
> diff --git a/Documentation/rbtree.txt b/Documentation/rbtree.txt
> index 19f8278..b847598 100644
> --- a/Documentation/rbtree.txt
> +++ b/Documentation/rbtree.txt
> @@ -196,15 +196,20 @@ Support for Augmented rbtrees
>  Augmented rbtree is an rbtree with "some" additional data stored in each node.
>  This data can be used to augment some new functionality to rbtree.
>  Augmented rbtree is an optional feature built on top of basic rbtree
> -infrastructure. rbtree user who wants this feature will have an augment
> -callback function in rb_root initialized.
> -
> -This callback function will be called from rbtree core routines whenever
> -a node has a change in one or both of its children. It is the responsibility
> -of the callback function to recalculate the additional data that is in the
> -rb node using new children information. Note that if this new additional
> -data affects the parent node's additional data, then callback function has
> -to handle it and do the recursive updates.
> +infrastructure. rbtree user who wants this feature will have to call the
> +augmentation functions with the user provided augmentation callback
> +when inserting and erasing nodes.
> +
> +On insertion, The user must call rb_augment_insert() once the new node is in
> +place. This will cause the augmentation function callback to be called for
> +each node between the new node and the root which have been affected by the
> +insertion.
> +
> +When erasing a node, The user must call rb_augment_erase_begin() first to
> +retrieve the deepest node on the rebalance path. Then, After erasing the
> +original node, the user must call rb_augment_erase_end() with the deepest
> +node found earlier. This will cause the augmentation function to be called
> +for each affected node between the deepest node and the root.
>  
> 
>  Interval tree is an example of augmented rb tree. Reference -

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