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. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
