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

[Cong Wang <xiyou.wangcong@xxxxxxxxx>]

On 03/07/2012 12:49 PM, Barry Song wrote:
> 2012/3/7 Cong Wang<xiyou.wangcong@xxxxxxxxx>:
> > On 03/07/2012 11:14 AM, Barry Song wrote:
> > > From: Barry Song<Baohua.Song@xxxxxxx>
> > >
> > > 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.

Why not important? You want it to be merged, don't you?

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

Why /dev interface is easier than /proc and /sys? Confused, actually I 
think /proc or /sys should be easier...

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