Timur Tabi <timur.tabi@xxxxxxxxxxx> writes: > Ed L Cashin wrote: > >> pte_offset_map, if I recall correctly, can map a high-memory page >> table into the kernel address space. Later pte_unmap removes the >> mapping. pte_offset doesn't do that. > > So you're saying that the page table itself is in high memory, outside > the normal visibility of the kernel? Wouldn't that significantly > impact performance? Yes! It's a tradeoff, and I know little about the specifics of that tradeoff. There's probably a lot of info in the archives of the linux-mm mailing list, though. -- Ed L Cashin <ecashin@xxxxxxxxxx> -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
