On Tuesday 14 June 2011 18:58:35 Michal Nazarewicz wrote:

On Tue, 14 Jun 2011 18:03:00 +0200, Arnd Bergmann wrote:

quoted

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.

That is indeed a good point, but having a good allocator algorithm
could also solve this. I don't know too much about these allocation
algorithms, but there are probably multiple working approaches to this.

quoted

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.

What is bad IMHO is making them the default, which forces the board
code to care about memory management details. I would much prefer
to have contiguous allocation parameters tuned automatically to just
work on most boards before we add ways to do board-specific hacks.

	Arnd