Thread (59 messages) 59 messages, 14 authors, 2011-07-04

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

From: Michal Nazarewicz <hidden>
Date: 2011-06-14 16:58:43
Also in: linux-media, linux-mm, lkml

quoted
On Tue, 14 Jun 2011 15:49:29 +0200, Arnd Bergmann [off-list ref] wrote:
quoted
Please explain the exact requirements that lead you to defining  
multiple contexts.
On Tuesday 14 June 2011, Michal Nazarewicz wrote:
quoted
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.

-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michal "mina86" Nazarewicz    (o o)
ooo +-----<email/xmpp: mnazarewicz@google.com>-----ooO--(_)--Ooo--
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