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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Subject: Re: How to efficiently handle DMA and cache on ARMv7 ? (was "Is get_user_pages() enough to prevent pages from being swapped out ?")
From: Laurent Desnogues <laurent.desnogues@xxxxxxxxx>
Date: Fri, 7 Aug 2009 14:07:43 +0200
Cc: Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx>, Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>, David Xiao <dxiao@xxxxxxxxxxxx>, Ben Dooks <ben-linux@xxxxxxxxx>, Hugh Dickins <hugh.dickins@xxxxxxxxxxxxx>, Robin Holt <holt@xxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, v4l2_linux <linux-media@xxxxxxxxxxxxxxx>, "linux-arm-kernel@xxxxxxxxxxxxxxxxxxxxxx" <linux-arm-kernel@xxxxxxxxxxxxxxxxxxxxxx>
In-reply-to: <20090807095426.GI8725@xxxxxxxxxxxxx>

On Fri, Aug 7, 2009 at 11:54 AM, Jamie Lokier<jamie@xxxxxxxxxxxxx> 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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References:
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