linux-kernel - Re: [PATCH -mm 2/2] mm: do not reset mm->free_area

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Date:	Mon, 27 Feb 2012 11:13:46 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, Mel Gorman <mel@....ul.ie>,
	Johannes Weiner <hannes@...xchg.org>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Andrea Arcangeli <aarcange@...hat.com>, hughd@...gle.com
Subject: Re: [PATCH -mm 2/2] mm: do not reset mm->free_area_cache on every
 single munmap

On 02/23/2012 04:57 PM, Andi Kleen wrote:
> Rik van Riel<riel@...hat.com>  writes:
>
>> Some programs have a large number of VMAs, and make frequent calls
>> to mmap and munmap. Having munmap constantly cause the search
>> pointer for get_unmapped_area to get reset can cause a significant
>> slowdown for such programs.
>
> This would be a much nicer patch if you split it into one that merges
> all the copy'n'paste code and another one that actually implements
> the new algorithm.

The copy'n'pasted functions are not quite the same, though.

All the ones that could be unified already have been, leaving
a few functions with actual differences around.

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