> > >> >> The mem_map array is the same on each node, copied from the boot_node > >> >> to all other nodes. It contains page_struct entries for ALL pages on > >> >> ALL nodes (if I interpret discontig_paging_init() correctly). The > >> >> first two sentences need to be reformulated. > >> > >> Arrrghh! Why on earth would you want to do that? How are you going to > >> atomically update things? Replicating things that are heavily written to is > >> a bad idea. > > > > We dont do that!!! > > Great. Though I'm not suprised it got misread .... the current code around mem_map > is very confusing. > I should have explained a little more though. There are a couple of tables that are used for:: - finding the mem_map arrays on each of the node - virt_to_page() macro - basic node manipulation macros (address to node, etc) Theses table are relatively small and are read-only after boot is complete. These tables are replicated on each node & are located via the cpu_data structure.. None of the macros virt_to_page(), address_to_node, etc make offnode references to any data structures (other than the page_struct, of course, if it is non-local). -- Thanks Jack Steiner (651-683-5302) (vnet 233-5302) steiner@sgi.comReceived on Fri Aug 16 17:26:51 2002
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