linux-kernel - Re: [PATCH v3] MM: CMA: add a simple kernel module as the helper to test CMA

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Message-ID: <4F56E0AC.8070501@gmail.com>
Date:	Wed, 07 Mar 2012 12:14:36 +0800
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Barry Song <Barry.Song@....com>
CC:	m.szyprowski@...sung.com, mina86@...a86.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	workgroup.linux@....com, Barry Song <Baohua.Song@....com>
Subject: Re: [PATCH v3] MM: CMA: add a simple kernel module as the helper
 to test CMA

On 03/07/2012 11:14 AM, Barry Song wrote:
> From: Barry Song<Baohua.Song@....com>
>
> Any write request to /dev/cma_test will let the module to allocate memory from
> CMA, for example:
>
> 1st time
> $ echo 1024>  /dev/cma_test
> will require cma_test to request 1MB(1024KB)
> 2nd time
> $ echo 2048>  /dev/cma_test
> will require cma_test to request 2MB(2048KB)
>
> Any read request to /dev/cma_test will let the module to free the 1st valid
> memory from CMA, for example:
>
> 1st time
> $ cat /dev/cma_test
> will require cma_test to free the 1MB allocated in the first write request
> 2nd time
> $ cat /dev/cma_test
> will require cma_test to free the 2MB allocated in the second write request

Any reason why using /dev not /proc or /sys?
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