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From: Chris Ball <cjb@laptop.org>
To: Kyungsik Lee <kyungsik.lee@lge.com>
Cc: Venkatraman S <svenkatr@ti.com>,
	Jaehoon Chung <jh80.chung@samsung.com>,
	Adrian Hunter <ext-adrian.hunter@nokia.com>,
	Philip Rakity <prakity@marvell.com>,
	raphael.andy.lee@gmail.com, linux-mmc@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH RESEND v6] mmc: core: Remove bounce buffer in mmc_send_cxd_data()
Date: Mon, 17 Sep 2012 03:32:12 -0400	[thread overview]
Message-ID: <m3txuxyuir.fsf@pullcord.laptop.org> (raw)
In-Reply-To: <1343955483-6917-1-git-send-email-kyungsik.lee@lge.com> (Kyungsik Lee's message of "Fri, 3 Aug 2012 09:58:03 +0900")

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@lge.com>
> Reviewed-by: Venkatraman S <svenkatr@ti.com>

Thanks, pushed to mmc-next for 3.7.

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

      reply	other threads:[~2012-09-17  7:32 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-08-03  0:58 [PATCH RESEND v6] mmc: core: Remove bounce buffer in mmc_send_cxd_data() Kyungsik Lee
2012-09-17  7:32 ` Chris Ball [this message]

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