Re: [PATCH] i386: single node SPARSEMEM fix

[Martin J. Bligh]

--On Wednesday, September 07, 2005 11:27:54 -0700 Dave Hansen <haveblue@xxxxxxxxxx> wrote:

> On Wed, 2005-09-07 at 11:22 -0700, Martin J. Bligh wrote:
>> CONFIG_NUMA was meant to (and did at one point) support both NUMA and flat
>> machines. This is essential in order for the distros to support it - same
>> will go for sparsemem.
> 
> That's a different issue.  The current code works if you boot a NUMA=y
> SPARSEMEM=y machine with a single node.  The current Kconfig options
> also enforce that SPARSEMEM depends on NUMA on i386.
> 
> Magnus would like to enable SPARSEMEM=y while CONFIG_NUMA=n.  That
> requires some Kconfig changes, as well as an extra memory present call.
> I'm questioning why we need to do that when we could never do
> DISCONTIG=y while NUMA=n on i386.

Ah, OK - makes more sense. However, some machines do have large holes
in e820 map setups - is not really critical, more of an efficiency
thing.

M.

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