linux-kernel - Re: [PATCH v2 5/9] rbtree: handle 1-child recoloring in rb_erase() instead of rb_erase

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Message-ID: <501F1D86.7020409@redhat.com>
Date:	Sun, 05 Aug 2012 21:27:34 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Michel Lespinasse <walken@...gle.com>
CC:	peterz@...radead.org, daniel.santos@...ox.com, aarcange@...hat.com,
	dwmw2@...radead.org, akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org
Subject: Re: [PATCH v2 5/9] rbtree: handle 1-child recoloring in rb_erase()
 instead of rb_erase_color()

On 08/02/2012 06:34 PM, Michel Lespinasse wrote:
> An interesting observation for rb_erase() is that when a node has
> exactly one child, the node must be black and the child must be red.
> An interesting consequence is that removing such a node can be done by
> simply replacing it with its child and making the child black,
> which we can do efficiently in rb_erase(). __rb_erase_color() then
> only needs to handle the no-childs case and can be modified accordingly.
>
> Signed-off-by: Michel Lespinasse<walken@...gle.com>

Acked-by: Rik van Riel <riel@...hat.com>


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