The trouble with get_user_pages()
The trouble with get_user_pages()
[Kernel] Posted Apr 30, 2018 14:55 UTC (Mon) by corbet
When kernel code needs to work directly with user-space pages, it often calls get_user_pages() (or one of several variants) to fault those pages into RAM and pin them there. This function is not entirely easy to use, though, and recent changes have made it harder to use safely. Jan Kara and Dan Williams led a plenary session at the 2018 Linux Storage, Filesystem, and Memory-Management Summit to discuss potential solutions, but it is not entirely clear that any were found.