Re: [RFC] Make the slab allocator observe NUMA policies

[Christoph Lameter <clameter@engr.sgi.com>]

On Tue, 15 Nov 2005, Andi Kleen wrote:

> On Monday 14 November 2005 20:08, Christoph Lameter wrote:
> > I have thought about various ways to modify kmem_getpages() but these do 
> > not fit into the basic current concept of the slab allocator. The 
> > proposed method is the cleanest approach that I can think of. I'd be glad 
> > if you could come up with something different but AFAIK simply moving the 
> > policy application down in the slab allocator does not work.
> 
> I haven't checked all the details, but why can't it be done at the cache_grow
> layer? (that's already a slow path)

cache_grow is called only after the lists have been checked. Its the same
scenario as I described.

> If it's not possible to do it in the slow path I would say the design is 
> incompatible with interleaving then. Better not do it then than doing it wrong.

If MPOL_INTERLEAVE  is set then multiple kmalloc() invocations will 
allocate each item round robin on each node. That is the intended function 
of MPOL_INTERLEAVE right?

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