linux-kernel - Re: [PATCH] ps3/block: Replace mtd/ps3vram by block/ps3vram

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Date:	Mon, 9 Mar 2009 10:51:43 -0700
From:	Geoff Levand <geoffrey.levand@...sony.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>,
	Jens Axboe <jens.axboe@...cle.com>, Jim Paris <jim@...n.com>,
	Vivien Chappelier <vivien.chappelier@...e.fr>,
	David Woodhouse <dwmw2@...radead.org>,
	Arnd Bergmann <arnd@...db.de>,
	Linux/PPC Development <linuxppc-dev@...abs.org>,
	Cell Broadband Engine OSS Development 
	<cbe-oss-dev@...abs.org>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	linux-mtd@...ts.infradead.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] ps3/block: Replace mtd/ps3vram by block/ps3vram

On 03/06/2009 04:54 AM, Geert Uytterhoeven wrote:
> Convert the PS3 Video RAM Storage Driver from an MTD driver to a plain block
> device driver.
> 
> The ps3vram driver exposes unused video RAM on the PS3 as a block device
> suitable for storage or swap.  Fast data transfer is achieved using a local
> cache in system RAM and DMA transfers via the GPU.
> 
> The new driver is ca. 50% faster for reading, and ca. 10% for writing.
> 
>  arch/powerpc/platforms/ps3/Kconfig |    7 +
>  drivers/block/Makefile             |    1 +
>  drivers/block/ps3vram.c            |  865 ++++++++++++++++++++++++++++++++++++
>  drivers/mtd/devices/Kconfig        |    7 -
>  drivers/mtd/devices/Makefile       |    1 -
>  drivers/mtd/devices/ps3vram.c      |  768 --------------------------------
>  6 files changed, 873 insertions(+), 776 deletions(-)
>  create mode 100644 drivers/block/ps3vram.c
>  delete mode 100644 drivers/mtd/devices/ps3vram.c

Looks good, certainly an improvement.

Acked-by: Geoff Levand <geoffrey.levand@...sony.com>

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