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

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Date:	Mon, 16 May 2011 18:44:49 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Randy Dunlap <rdunlap@...otime.net>
Cc:	Sasha Levin <levinsasha928@...il.com>,
	linux-kernel@...r.kernel.org,
	Pekka Enberg <penberg@...helsinki.fi>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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


* Randy Dunlap <rdunlap@...otime.net> wrote:

> On Mon, 16 May 2011 12:56:42 +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>
> > Cc: 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
> 
>                  the user
> 
> > +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
> 
>                                                which has been
> 
> > +insertion.
> > +
> > +When erasing a node, The user must call rb_augment_erase_begin() first to
> 
>                         the user
> 
> > +retrieve the deepest node on the rebalance path. Then, After erasing the
> 
>                                                           after
> 
> > +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.

Heh, you really rock at reviewing documentation!

I went through the text and could have sworn that beyond the small detail i 
pointed out it's otherwise perfect ;-)

Thanks,

	Ingo
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