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To: Gerrit Huizenga <gh@us.ibm.com>
Cc: akpm@digeo.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2.5.43-mm2] New shared page table patch
References: <3DB59DA7.453F89E2@digeo.com> <E1844MH-00027H-00@w-gerrit2>
From: Andi Kleen <ak@muc.de>
Date: 23 Oct 2002 05:03:38 +0200
In-Reply-To: <E1844MH-00027H-00@w-gerrit2>
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Gerrit Huizenga <gh@us.ibm.com> writes:

> If the shared pte patch had mmap support, then all shared libraries
> would benefit.  Might need to align them to 4 MB boundaries for best
> results, which would also be easy for libraries with unspecified
> attach addresses (e.g. most shared libraries).

But only if the shared libraries are a multiple of 2/4MB, otherwise you'll
waste memory. Or do you propose to link multiple mmap'ed libraries together
into the same page ? 

But I agree it would be nice to have a chattr for files that tells
mmap() to use large pages for them.

-Andi
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