Messages in this thread | | | Date | Mon, 22 Jan 2007 19:28:01 -0800 (PST) | From | Christoph Lameter <> | Subject | Re: Why active list and inactive list? |
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On Tue, 23 Jan 2007, Balbir Singh wrote:
> When you unmap or map, you need to touch the pte entries and know the > pages involved, so shouldn't be equivalent to a list_del and list_add > for each page impacted by the map/unmap operation?
When you unmap and map you must currently get exclusive access to the cachelines of the pte and the cacheline of the page struct. If we use a list_move on page->lru then we have would have to update pointers in up to 4 other page structs. Thus we need exclusive access to 4 additional cachelines. This triples the number of cachelines touched. Instead of 2 cachelines we need 6.
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