linux-kernel - Re: [PATCH -mm v2 01/11] mm: track free size between VMAs in VMA rbtree

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Message-ID: <1340359079.18025.56.camel@twins>
Date:	Fri, 22 Jun 2012 11:57:59 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Rik van Riel <riel@...riel.com>
Cc:	linux-mm@...ck.org, akpm@...ux-foundation.org, aarcange@...hat.com,
	minchan@...il.com, kosaki.motohiro@...il.com, andi@...stfloor.org,
	hannes@...xchg.org, mel@....ul.ie, linux-kernel@...r.kernel.org,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH -mm v2 01/11] mm: track free size between VMAs in VMA
 rbtree

On Thu, 2012-06-21 at 17:57 -0400, Rik van Riel wrote:
> +/*
> + * Use the augmented rbtree code to propagate info on the largest
> + * free gap between VMAs up the VMA rbtree.
> + */
> +static void adjust_free_gap(struct vm_area_struct *vma)
> +{
> +       rb_augment_erase_end(&vma->vm_rb, vma_rb_augment_cb, NULL);
> +} 

I was more thinking along the lines of:

/*
 * Abuse rb_augment_erase_end() to propagate a modification up
 * the tree by pretending the modified node is the deepest node
 * still in the tree.
 */


Alternatively, we could add rb_augment_mod() or somesuch.
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