On Fri, 23 Mar 2007, Eric Dumazet wrote:
> Sorry ? page structs are not in cpu cache at all.
They are if they are in any way handled by the VM.
> You carefully commented your alloc() function saying it is touching two cache
> lines.
> But you omited to say that free() function needs 3 cache lines if CONFIG_NUMA
Yes it needs the third cacheline to check the node of the page in the NUMA
case.
> For SLAB use, page struct is needed because we use lru.{next|prev} to
> store slab/cachep pointers, but for a pure page allocator, unless I
> misread your patch, we dont need it, if virt_to_nid() can do its job
> without it.
The page allocator is only handling page_structs.
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