linux-kernel - Re: missing madvise functionality

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Message-ID: <4612C5AC.2070008@goop.org>
Date:	Tue, 03 Apr 2007 14:22:52 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Eric Dumazet <dada1@...mosbay.com>
CC:	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ulrich Drepper <drepper@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Jakub Jelinek <jakub@...hat.com>, linux-mm@...ck.org,
	Hugh Dickins <hugh@...itas.com>
Subject: Re: missing madvise functionality

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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