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SubjectRe: [RFC] Use compound pages for higher order slab allocations.
Christoph Lameter wrote:

>+static inline struct page *virt_to_compound_page(const void *addr)
>+ struct page * page = virt_to_page(addr);
>+ if (PageCompound(page))
>+ page = (struct page *)page_private(page);
This would end up in every kmem_cache_free/kfree call. Is it really
worth the effort, are the high order allocation a problem?
I'm against such a change without a clear proof that just using high
order allocations is not possible.

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