linux-kernel - Re: [RFC] User space to kernel space copy optimization

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Message-ID: <20151205081030.GM1854@localhost>
Date:	Sat, 5 Dec 2015 13:40:31 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Sinan Kaya <okaya@...eaurora.org>
Cc:	dmaengine@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] User space to kernel space copy optimization

On Mon, Nov 16, 2015 at 04:53:27PM -0500, Sinan Kaya wrote:
> One of the things I'm interested in is to use a memcpy capable DMA
> engine HW to optimize user space and kernel space parameter copying.
> 
> Of course, this will not be viable for all parameter sizes but I can see
> this being useful. The goal is to save power in the cost of little
> performance.
> 
> Before I go and invent my own mechanism, I'd like to have ideas on what
> an acceptable solution would look like. Especially, I'm looking for a
> generic implementation that could plug into any DMA engine HW.

Do you have a proposal on how this generic solution should look like, broad
contours of the design to start off with and we can start from that point

-- 
~Vinod
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