Mel Gorman [off-list ref] wrote:

Buddy allocators, including the
 one implemented in Linux, do not record what order allocation a struct
 page belongs to.

We can do that.

--- 25/mm/page_alloc.c~a	2003-06-26 13:09:11.000000000 -0700
+++ 25-akpm/mm/page_alloc.c	2003-06-26 13:09:24.000000000 -0700

@@ -123,6 +123,7 @@ static void prep_compound_page(struct pa
 		SetPageCompound(p);
 		p->lru.next = (void *)page;
 	}
+	page[1].index = order;
 }
 
 static void destroy_compound_page(struct page *page, unsigned long order)

_

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