On Fri, 1 May 2009, Mel Gorman wrote:

But IIRC, the vmemmap code depends on architecture-specific help from
vmemmap_populate() to place the map in the right place and it's not universally
available. It's likely that similar would be needed to support large
hash tables. I think the networking guys would need to be fairly sure
the larger table would make a big difference before tackling the
problem.

The same function could be used. Fallback to vmap is always possible.

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