linux-kernel - Re: [patch 0/4] MAP_NOZERO v2 - VM_NOZERO/MAP

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Message-ID: <a36005b50706282209p52cd3251l7ce2d90ca700cd99@mail.gmail.com>
Date:	Thu, 28 Jun 2007 22:09:58 -0700
From:	"Ulrich Drepper" <drepper@...il.com>
To:	"Rik van Riel" <riel@...hat.com>
Cc:	"Kyle Moffett" <mrmacman_g4@....com>,
	"Davide Libenzi" <davidel@...ilserver.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Andy Isaacson" <adi@...apodia.org>
Subject: Re: [patch 0/4] MAP_NOZERO v2 - VM_NOZERO/MAP_NOZERO early summer madness

On 6/28/07, Rik van Riel <riel@...hat.com> wrote:
> That wants MAP_PRIVATE so that the kernel can also decide to not
> swap these pages out to an unencrypted swap area.

That's not what MAP_PRIVATE means.  MAP_PRIVATE is the opposite of
MAP_SHARED.  It's meaningless for anonymous memory (which is what
ssh-agent etc would use) and for file-backed data it definitely allows
swapping unless you use mlock().
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