Messages in this thread | | | From | Barry Song <> | Date | Wed, 7 Mar 2012 12:49:21 +0800 | Subject | Re: [PATCH v3] MM: CMA: add a simple kernel module as the helper to test CMA |
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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.
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