linux-kernel - Re: [PATCH RESEND v6] mmc: core: Remove bounce buffer in mmc_send_cxd

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Message-ID: <m3txuxyuir.fsf@pullcord.laptop.org>
Date:	Mon, 17 Sep 2012 03:32:12 -0400
From:	Chris Ball <cjb@...top.org>
To:	Kyungsik Lee <kyungsik.lee@....com>
Cc:	Venkatraman S <svenkatr@...com>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	Adrian Hunter <ext-adrian.hunter@...ia.com>,
	Philip Rakity <prakity@...vell.com>,
	raphael.andy.lee@...il.com, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND v6] mmc: core: Remove bounce buffer in mmc_send_cxd_data()

Hi,

On Thu, Aug 02 2012, Kyungsik Lee wrote:
> It is expected that Extended CSD register(the size of this register
> is larger than CID/CSD) will be referenced more frequently as more
> fields have been added to Extended CSD and it seems that it is not
> a good option to double the memory used.
>
> This patch is intended to avoid the use of bounce buffer for reading
> Extended CSD register in mmc_send_cxd_data(). It will provide a better
> performance gain by removing memcpy() overhead for a half KiB and
> a redundant bounce buffer allocated repeatedly at the cost of providing
> DMA-capable buffer from upper caller(but on-stack buffer is allowed
> with no performance gain).
>
> Signed-off-by: Kyungsik Lee <kyungsik.lee@....com>
> Reviewed-by: Venkatraman S <svenkatr@...com>

Thanks, pushed to mmc-next for 3.7.

- Chris.
-- 
Chris Ball   <cjb@...top.org>   <http://printf.net/>
One Laptop Per Child
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