Re: [Xen-devel] [PATCH 2/6] xen: Add NUMA support to Xen

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 1 May 2006, at 22:57, Ryan Harper wrote:

> This patch introduces a per-node layer to the buddy allocator.  Xen 
> currently
> defines the heap as a two-dimensional array, [zone][order].  This 
> patch adds a
> node layer between zone and order.  This allows Xen to hand memory out 
> in the
> proper zone while preferring local memory allocation, but can 
> fall-back on
> non-local to satisfy a zone request.
Loops over every memory chunk structure on the alloc/free paths aren't 
going to get merged. There's no need for it -- in most cases memory 
chunks are probably aligned on a MAX_ORDER boundary (or they will be 
when I reduce MAX_ORDER, which requires me to fix up our Linux swiotlb 
a bit first). When that isn't the case you can simply reserve guard 
pages at the start and end of such chunks to avoid cross-chunk merging.
 -- Keir


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