On Fri, Oct 03, 2014 at 07:07:58PM +0200, Andrea Arcangeli wrote: > MADV_USERFAULT is a new madvise flag that will set VM_USERFAULT in the > vma flags. Whenever VM_USERFAULT is set in an anonymous vma, if > userland touches a still unmapped virtual address, a sigbus signal is > sent instead of allocating a new page. The sigbus signal handler will > then resolve the page fault in userland by calling the > remap_anon_pages syscall. What does "unmapped virtual address" mean in this context? Mike -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>