4.12-rc ppc64 4k-page needs costly allocations

[Christoph Lameter]

On Thu, 1 Jun 2017, Hugh Dickins wrote:

> Thanks a lot for working that out.  Makes sense, fully understood now,
> nothing to worry about (though makes one wonder whether it's efficient
> to use ctors on high-alignment caches; or whether an internal "zero-me"
> ctor would be useful).

Use kzalloc to zero it. And here is another example of using slab
allocations for page frames. Use the page allocator for this? The page
allocator is there for allocating page frames. The slab allocator main
purpose is to allocate small objects....