linux-kernel - Re: [PATCH v2] NOMMU: add support for Memory Protection Units (MPU)

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Message-ID: <12331.1247653900@redhat.com>
Date:	Wed, 15 Jul 2009 11:31:40 +0100
From:	David Howells <dhowells@...hat.com>
To:	Bernd Schmidt <bernds_cb1@...nline.de>
Cc:	dhowells@...hat.com, Mike Frysinger <vapier@...too.org>,
	linux-kernel@...r.kernel.org,
	uclinux-dist-devel@...ckfin.uclinux.org,
	Bryan Wu <cooloney@...nel.org>
Subject: Re: [PATCH v2] NOMMU: add support for Memory Protection Units (MPU)

Bernd Schmidt <bernds_cb1@...nline.de> wrote:

> No page table, just three bitmaps (r/w/x), with one bit per page, per mm.

That sounds a bit inefficient as you have to make three accesses per page.  I
suppose it depends on how your MPU works.

David
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