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

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Date:	Fri, 22 Jun 2012 10:25:24 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Rik van Riel <riel@...riel.com>, 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
Subject: Re: [PATCH -mm v2 01/11] mm: track free size between VMAs in VMA
 rbtree

On 06/22/2012 10:13 AM, Peter Zijlstra wrote:
> On Fri, 2012-06-22 at 10:11 -0400, Rik van Riel wrote:
>>
>> I am still trying to wrap my brain around your alternative
>> search algorithm, not sure if/how it can be combined with
>> arbitrary address limits and alignment...
>
> for alignment we can do: len += align - 1;

We could, but that might lead us to returning -ENOMEM
when we actually have memory available.

When you consider architectures like HPPA, which use
a pretty large alignment, but align everything the same,
chances are pretty much every freed hole will have the
right alignment...

> Will indeed need to ponder the range thing ;-)


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