Re: [RFC PATCH] mm: cma: add functions for getting allocation info

[Laura Abbott]

On 12/17/2014 2:10 PM, Gregory Fong wrote:
> These functions allow for retrieval of information on what is allocated from
> within a given CMA region.  It can be useful to know the number of distinct
> contiguous allocations and where in the region those allocations are located.
>
> Based on an initial version by Marc Carino <marc.ceeeee@xxxxxxxxx> in a driver
> that used the CMA bitmap directly; this instead moves the logic into the core
> CMA API.
>
> Signed-off-by: Gregory Fong <gregory.0xf0@xxxxxxxxx>
> ---
> This has been really useful for us to determine allocation information for a
> CMA region.  We have had a separate driver that might not be appropriate for
> upstream, but allowed using a user program to run CMA unit tests to verify that
> allocations end up where they we would expect.  This addition would allow for
> that without needing to expose the CMA bitmap.  Wanted to put this out there to
> see if anyone else would be interested, comments and suggestions welcome.

Information is definitely useful but I'm not sure how it's intended to
be used. Do you have a sample usage of these APIs? Another option might
be to just add regular debugfs support for each of the regions instead
of just calling out to a separate driver.

Thanks,
Laura

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