Re: [PATCH] numa: mempolicy: dynamic interleave map for system init.

[Andrew Morton <akpm@linux-foundation.org>]

On Thu, 7 Jun 2007 19:47:09 -0700 (PDT) Christoph Lameter <clameter@sgi.com> wrote:

> On Thu, 7 Jun 2007, Andrew Morton wrote:
> 
> > Well I took silence as assent.
> 
> Well, grudgingly. How far are we willing to go to support these asymmetric 
> setups? The NUMA code initially was designed for mostly symmetric systems 
> with roughly the same amount of memory on each node. The farther we go 
> from this the more options we will have to add special casing to deal with 
> these imbalances.
> 
> With memoryless nodes we already have one issue that will ripple through 
> the kernel likely requiring numerous modifications and special casing. 
> Then we now have the ZONE_DMA issues reording the zonelists. Now we will 
> support systems with 1MB size nodes? We will need to modify the slab 
> allocators to only allocate on special processors?
> 

Failing to support memoryless nodes was a bug, and we should continue to
take bugfixes for that.

Dunno about the rest - it depends upon how real-world are the problems
which people hit, and upon how messy the fixes look.

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