Re: [PATCH v6 02/10] x86, mpx: add MPX specific mmap interface

[Dave Hansen]

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.
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