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    SubjectRe: [PATCH v3] MM: CMA: add a simple kernel module as the helper to test CMA
    2012/3/7 Cong Wang <xiyou.wangcong@gmail.com>:
    > On 03/07/2012 11:14 AM, Barry Song wrote:
    >>
    >> From: Barry Song<Baohua.Song@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?

    pls note it is just a test module to verify CMA at runtime. it is not
    important either it is /dev, it is /proc or it is /sys.

    any way to make things easier, we take that way.

    -barry
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