Hi Andrew,
On Tue, May 07, 2013 at 01:16:30PM +0200, Andrew Jones wrote:
> On Mon, May 06, 2013 at 09:56:58PM +0200, Andrea Arcangeli wrote:
> > @@ -405,6 +420,7 @@ madvise_behavior_valid(int behavior)
> > case MADV_HUGEPAGE:
> > case MADV_NOHUGEPAGE:
> > #endif
> > + case MADV_USERFAUL
On Mon, May 06, 2013 at 09:56:58PM +0200, Andrea Arcangeli wrote:
> +++ b/mm/madvise.c
> @@ -93,6 +93,21 @@ static long madvise_behavior(struct vm_area_struct * vma,
> if (error)
> goto out;
> break;
> + case MADV_USERFAULT:
> + if (
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 fa
