From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Tue, 03 Apr 2007 14:22:52 -0700
From: Jeremy Fitzhardinge <jeremy@goop.org>
MIME-Version: 1.0
Subject: Re: missing madvise functionality
References: <46128051.9000609@redhat.com>	<p73648dz5oa.fsf@bingen.suse.de>	<46128CC2.9090809@redhat.com>	<20070403172841.GB23689@one.firstfloor.org>	<20070403125903.3e8577f4.akpm@linux-foundation.org>	<4612B645.7030902@redhat.com> <20070403135154.61e1b5f3.akpm@linux-foundation.org> <4612C059.8070702@redhat.com> <4612C2B6.3010302@cosmosbay.com>
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To: Eric Dumazet <dada1@cosmosbay.com>
Cc: Rik van Riel <riel@redhat.com>, Andrew Morton <akpm@linux-foundation.org>, Ulrich Drepper <drepper@redhat.com>, Andi Kleen <andi@firstfloor.org>, Linux Kernel <linux-kernel@vger.kernel.org>, Jakub Jelinek <jakub@redhat.com>, linux-mm@kvack.org, Hugh Dickins <hugh@veritas.com>
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Eric Dumazet wrote:
> mmap()/brk() must give fresh NULL pages, but maybe
> madvise(MADV_DONTNEED) can relax this requirement (if the pages were
> reclaimed, then a page fault could bring a new page with random content) 

Only if those pages were originally from that process.  Otherwise you've
got a bit of an information leak there.

    J

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