alloc_pages_exact vs. alloc_pages

"alloc_pages_exact() is similar to alloc_pages(), except that it allocates the minimum number of pages to fulfill the request. This is useful if you want to allocate a very large buffer that is slightly larger than an even power-of-two number of pages. In that case, alloc_pages() will waste a lot of memory."

and

"2379 * alloc_pages_exact - allocate an exact number physically-contiguous pages.

2380 * @size: the number of bytes to allocate 2381 * @gfp_mask: GFP flags for the allocation 2382 * 2383 * This function is similar to alloc_pages(), except that it allocates the 2384 * minimum number of pages to satisfy the request. alloc_pages() can only 2385 * allocate memory in power-of-two pages."

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