linux-kernel - Re: [PATCH 4/6] rbtree: faster augmented insert

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Date:	Wed, 25 Jul 2012 13:54:07 -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
Subject: Re: [PATCH 4/6] rbtree: faster augmented insert

On 07/20/2012 08:31 AM, Michel Lespinasse wrote:
> Introduce rb_insert_augmented(), which is a version of rb_insert_color()
> with an added callback on tree rotations. This can be used for insertion
> into an augmented tree: the handcoded search phase must be updated to
> maintain the augmented information on insertion, and then the rbtree
> coloring/rebalancing algorithms keep it up to date.
>
> rb_insert_color() is now a special case of rb_insert_augmented() with
> a do-nothing callback. I used inlining to optimize out the callback,
> with the intent that this would generate the same code as previously
> for rb_insert_augmented(). This didn't fully work, as my compiler output
> is now *smaller* than before for that function. Speed wise, they seem
> comparable though.
>
> Signed-off-by: Michel Lespinasse <walken@...gle.com>

The second version of patch 5/6 takes care of my
concerns about this patch.

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