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

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Date:	Thu, 18 Dec 2014 09:00:37 -0800
From:	Laura Abbott <lauraa@...eaurora.org>
To:	Gregory Fong <gregory.0xf0@...il.com>, linux-mm@...ck.org
CC:	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Weijie Yang <weijie.yang@...sung.com>,
	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] mm: cma: add functions for getting allocation info

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@...il.com> 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@...il.com>
> ---
> 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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