On Wed, 2006-05-03 at 22:20 +0800, cheng long wrote: > > because it may be swapped out to disk ... > > you need a special function that can deal with that (and swaps it right > > back in) > Why can't we use the "page fault handler" like in user space to swap > the page back in? that's a lot more tricky than it sounds ;) (for example... how would you deliver SIGBUS to the kernel?) to make this practical, there is a special copy operation that does do this... but it's not generic. (it's also a really easy way to get security holes; by copying at least you get a snapshot of the data that the user cannot meddle with from another thread) -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
