On Fri, 20 Aug 2010 08:38:10 +0200
**UNKNOWN CHARSET** [off-list ref] wrote:

On Fri, 20 Aug 2010 05:12:50 +0200, FUJITA Tomonori [off-list ref] wrote:

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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.

You can create something similar to the existing API for memory
allocator.

That may be tricky.  cma_alloc() takes four parameters each of which is
required for CMA.  No other existing set of API uses all those arguments.
This means, CMA needs it's own, somehow unique API.  I don't quite see
how the APIs may be unified or "made similar".  Of course, I'm gladly
accepting suggestions.

Have you even tried to search 'blk_kmalloc' on google? I wrote
"similar to the existing API', not "reuse the existing API".

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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
    recognition.

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.

Well, why can't we do the above before the inclusion?

Because it's quite a bit of work and instead of diverting my attention I'd
prefer to make CMA as good as possible and then integrate it with other
subsystems.  Also, adding the integration would change the patch from being
4k lines to being like 40k lines.

4k to 40k? I'm not sure. But If I see something like the following, I
suspect that there is a better way to integrate this into the existing
infrastructure.

mm/cma-best-fit.c                   |  407 +++++++++++++++