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SubjectRe: [PATCH 0/2] Relax restrictions on setting CONFIG_NUMA on x86

* Mel Gorman <mel@csn.ul.ie> wrote:

> [...] I tested this situation on a 4-node NUMA Opteron box. It didn't
> work very well based on a few problems.
>
> - alloc_remap() and SPARSEMEM on HIGHMEM4G explodes [1]
> - Without SRAT, there is a build failure
> - Enabling SRAT requires BOOT_IOREMAP and it explodes early in boot
>
> I have one fix for items 1 and 2 with the patch below. It probably
> should be split in two but lets see if we want to pursue alternative
> fixes to this problem first. In particular, this patch stops SPARSEMEM
> using alloc_remap() because not enough memory is set aside. An
> alternative solution may be to reserve more for alloc_remap() when
> SPARSEMEM is in use.
>
> With the patch applied, an x86-64 capable NUMA Opteron box will boot a
> 32 bit NUMA enabled kernel with DISCONTIGMEM or SPARSEMEM. Due to the
> lack of SRAT parsing, there is only node 0 of course.
>
> Based on this, I have no doubt there is going to be a series of broken
> boots while stuff like this gets rattled out. For the moment, NUMA on
> x86 32-bit should remain CONFIG_EXPERIMENTAL.

thanks, applied.

Ingo


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