linux-kernel - Re: Zero copy between ISR, kernel and User

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Date:	Wed, 27 Sep 2006 12:10:30 -0700
From:	Stephen Hemminger <shemminger@...l.org>
To:	linux-kernel@...r.kernel.org
Subject: Re: Zero copy between ISR, kernel and User

On Tue, 26 Sep 2006 21:01:45 -0700
Wink Saville <wink@...ille.com> wrote:

> Hello,
> 
> I would like to allow the transferring of data between ISR's, kernel and 
> user code, without requiring copying. I envision allocating buffers in 
> the kernel and then mapping them so that they appear at the same 
> addresses to all code, and never being swapped out of memory.
> 
> Is this feasible for all supported Linux architectures and is there 
> existing code that someone could point me towards?
> 
> Regards,
> 
> Wink Saville
> 

Your better off having application mmap a device, then transfer
the data to there. Something like AF_PACKET.

-- 
Stephen Hemminger <shemminger@...l.org>
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