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SubjectRe: [PATCH/RFCv3 0/6] The Contiguous Memory Allocator framework
On Thu, 19 Aug 2010 17:15:12 +0200, FUJITA Tomonori <> wrote:

> On Wed, 18 Aug 2010 12:01:35 +0900
> Kyungmin Park <> wrote:
>> Are there any comments or ack?
>> We hope this method included at mainline kernel if possible.
>> It's really needed feature for our multimedia frameworks.
> You got any comments from mm people?
> Virtually, this adds a new memory allocator implementation that steals
> some memory from memory allocator during boot process. Its API looks
> completely different from the API for memory allocator. That doesn't
> sound appealing to me much. This stuff couldn't be integrated well
> into memory allocator?

What kind of integration do you mean? I see three levels:

1. Integration on API level meaning that some kind of existing API is used
instead of new cma_*() calls. CMA adds notion of devices and memory
types which is new to all the other APIs (coherent has notion of devices
but that's not enough). This basically means that no existing API can be
used for CMA. On the other hand, removing notion of devices and memory
types would defeat the whole purpose of CMA thus destroying the solution
that CMA provides.

2. Reuse of memory pools meaning that memory reserved by CMA can then be
used by other allocation mechanisms. This is of course possible. For
instance coherent could easily be implemented as a wrapper to CMA.
This is doable and can be done in the future after CMA gets more

3. Reuse of algorithms meaning that allocation algorithms used by other
allocators will be used with CMA regions. This is doable as well and
can be done in the future.

Best regards, _ _
| Humble Liege of Serenely Enlightened Majesty of o' \,=./ `o
| Computer Science, Michał "mina86" Nazarewicz (o o)

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