linux-kernel - Re: [PATCH 5/6] rbtree: faster augmented erase

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Date:	Fri, 27 Jul 2012 22:02:55 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Michel Lespinasse <walken@...gle.com>
Cc:	riel@...hat.com, 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 5/6] rbtree: faster augmented erase

On Fri, 2012-07-20 at 05:31 -0700, Michel Lespinasse wrote:
> +static inline void
> +rb_erase_augmented(struct rb_node *node, struct rb_root *root,
> +                  rb_augment_propagate *augment_propagate,
> +                  rb_augment_rotate *augment_rotate) 

So why put all this in a static inline in a header? As it stands
rb_erase() isn't inlined and its rather big, why would you want to
inline it for augmented callers? 

You could at least pull out the initial erase stuff into a separate
function, that way the rb_erase_augmented thing would shrink to
something like:

rb_erase_augmented(node, root)
{
	struct rb_node *parent, *child;
	bool black;

	__rb_erase(node, root, &parent, &child, &black);
	augmented_propagate(parent);
	if (black)
		__rb_erase_color(child, parent, root, augment_rotate);
}


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