linux-kernel - Re: [patch 1/3] MAP_NOZERO - implement a new VM_NOZERO/MAP

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Message-ID: <4683C539.4070202@redhat.com>
Date:	Thu, 28 Jun 2007 10:27:05 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Andy Isaacson <adi@...apodia.org>
CC:	Davide Libenzi <davidel@...ilserver.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [patch 1/3] MAP_NOZERO - implement a new VM_NOZERO/MAP_NOZERO
 page retirement policy

Andy Isaacson wrote:

> That said, I think I like the idea of MAP_NOZERO.  Could it be
> generalized to some kind of "free pool" rather than keyed off of uid?

Good idea.  At exec() time the new mm can inherit the "free pool"
pointer that the parent process points to, when nothing changes.

Certain events can cause a process to need another "free pool",
for example changing the UID, changing security context or
changing CPU/NUMA node binding.

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