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

[Cong Wang]

On 03/07/2012 11:14 AM, Barry Song wrote:
> From: Barry Song<Baohua.Song at csr.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?