Messages in this thread | | | From | Andy Lutomirski <> | Date | Thu, 26 Jun 2014 15:19:26 -0700 | Subject | Re: [PATCH v6 02/10] x86, mpx: add MPX specific mmap interface |
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On Wed, Jun 25, 2014 at 2:45 PM, Dave Hansen <dave.hansen@intel.com> 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
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