linux-kernel - Re: [PATCH, RFD] Unbreaking nommu mmap, v2

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Date:	Wed, 28 May 2008 18:51:50 +0200
From:	Bernd Schmidt <bernds_cb1@...nline.de>
To:	David Howells <dhowells@...hat.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Greg Ungerer <gerg@...pgear.com>,
	David McCullough <davidm@...pgear.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	Matt Mackall <mpm@...enic.com>,
	"Wu, Bryan" <Bryan.Wu@...log.com>,
	Mike Frysinger <vapier.adi@...il.com>
Subject: Re: [PATCH, RFD] Unbreaking nommu mmap, v2

David Howells wrote:
> Note that this patch unconditionally trims allocations, whereas on yours this
> is optional.  That can be easily remedied, if, in fact, the ability to request
> untrimmed allocations is worth doing.

Have you investigated the effect on fragmentation?  I backed off on 
trimming allocations, as it gave unacceptable results.

Is this patch different from the ones I tested last year?  They were not 
stable in my tests back then (fragmentation may have been an issue).


Bernd
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