linux-kernel - Re: How to efficiently handle DMA and cache on ARMv7 ? (was "Is get_user_pages() enough to prevent pages from being swapped out ?")

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Message-ID: <761ea48b0908070507n5c580455pb86e5240a7cf6c0c@mail.gmail.com>
Date:	Fri, 7 Aug 2009 14:07:43 +0200
From:	Laurent Desnogues <laurent.desnogues@...il.com>
To:	Jamie Lokier <jamie@...reable.org>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	David Xiao <dxiao@...adcom.com>,
	Ben Dooks <ben-linux@...ff.org>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Robin Holt <holt@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	v4l2_linux <linux-media@...r.kernel.org>,
	"linux-arm-kernel@...ts.arm.linux.org.uk" 
	<linux-arm-kernel@...ts.arm.linux.org.uk>
Subject: Re: How to efficiently handle DMA and cache on ARMv7 ? (was "Is 
	get_user_pages() enough to prevent pages from being swapped out ?")

On Fri, Aug 7, 2009 at 11:54 AM, Jamie Lokier<jamie@...reable.org> wrote:
>
> 1. Does the architecture not prevent speculative instruction
> prefetches from crossing a page boundary?  It would be handy under the
> circumstances.

There's no such restriction in ARMv7 architecture.


Laurent
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