On Wed, Jun 25, 2014 at 2:45 PM, Dave Hansen <dave.hansen@xxxxxxxxx> wrote: > On 06/25/2014 02:05 PM, Andy Lutomirski wrote: >> Hmm. the memfd_create thing may be able to do this for you. If you >> created a per-mm memfd and mapped it, it all just might work. > > memfd_create() seems to bring a fair amount of baggage along (the fd > part :) if all we want is a marker. Really, all we need is _a_ bit, and > some way to plumb to userspace the RSS values of VMAs with that bit set. > > Creating and mmap()'ing a fd seems a rather roundabout way to get there. Hmm. So does VM_MPX, though. If this stuff were done entirely in userspace, then memfd_create would be exactly the right solution, I think. Would it work to just scan the bound directory to figure out how many bound tables exist? --Andy -- 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>