On Fri, 23 Mar 2007, Eric Dumazet wrote:
> Checking Christoph quicklist implementation, I found the same cache miss in
> free() than SLAB has.
>
> /* common implementation *
> int virt_to_nid(const void *addr)
> {
> struct page *page = virt_to_page(addr);
> return page_to_nid(page);
> }
>
> On some platforms (x86_64 for example), could we have a better
> implementation, not accessing struct page, but using phys_to_nid() ?
This is going to pollute the caches since we then use multiple ways to
determine the node of a page. Its better to stay with the same approach
for all pages. The page struct is used for many other purposes as well.
Its likely to be in the cpu cache.
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