Re: 4.12-rc ppc64 4k-page needs costly allocations

Christoph Lameter [off-list ref] writes:

On Thu, 1 Jun 2017, Hugh Dickins wrote:

quoted

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.

But that's changing a per slab creation memset into a per object
allocation memset, isn't 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....

Well usually they are small (< PAGE_SIZE), because we have 64K pages.

But we could rework the code to use the page allocator on 4K configs.

cheers

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