[Linaro-mm-sig] [PATCH 08/10] mm: cma: Contiguous Memory Allocator added

Michal Nazarewicz mina86 at mina86.com
Tue Jun 14 16:58:35 UTC 2011


>> On Tue, 14 Jun 2011 15:49:29 +0200, Arnd Bergmann <arnd at arndb.de> wrote:
>>> Please explain the exact requirements that lead you to defining  
>>> multiple contexts.

> On Tuesday 14 June 2011, Michal Nazarewicz wrote:
>> Some devices may have access only to some banks of memory.  Some devices
>> may use different banks of memory for different purposes.

On Tue, 14 Jun 2011 18:03:00 +0200, Arnd Bergmann wrote:
> For all I know, that is something that is only true for a few very  
> special Samsung devices,

Maybe.  I'm just answering your question. :)

Ah yes, I forgot that separate regions for different purposes could
decrease fragmentation.

> I would suggest going forward without having multiple regions:

Is having support for multiple regions a bad thing?  Frankly,
removing this support will change code from reading context passed
as argument to code reading context from global variable.  Nothing
is gained; functionality is lost.

> * Remove the registration of specific addresses from the initial patch
>   set (but keep the patch).
> * Add a heuristic plus command-line override to automatically come up
>   with a reasonable location+size for *one* CMA area in the system.

I'm not arguing those.

-- 
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