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Date: Thu, 15 Mar 2012 17:18:32 -0500
From: Alan Cox <alc@rice.edu>
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To: Nathan Whitehorn <nwhitehorn@FreeBSD.org>
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Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org,
	src-committers@freebsd.org
Subject: Re: svn commit: r233011 - head/sys/powerpc/aim
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On 3/15/2012 2:36 PM, Nathan Whitehorn wrote:
> Author: nwhitehorn
> Date: Thu Mar 15 19:36:52 2012
> New Revision: 233011
> URL: http://svn.freebsd.org/changeset/base/233011
>
> Log:
>    Improve algorithm for deciding whether to loop through all process pages
>    or look them up individually in pmap_remove() and apply the same logic
>    in the other ranged operation (pmap_protect). This speeds up make
>    installworld by a factor of 2 on powerpc64.
>
>    MFC after:	1 week
>
> Modified:
>    head/sys/powerpc/aim/mmu_oea64.c
>

As an additional, related optimization, you should look into 
implementing pmap_remove_pages().

Alan