On Sun, 11 Sep 2016 10:31:35 -0700
Dan Williams [off-list ref] wrote:

As evidenced by this bug report [1], userspace libraries are interested
in whether a mapping is DAX mapped, i.e. no intervening page cache.
Rather than using the ambiguous VM_MIXEDMAP flag in smaps, provide an
explicit "is dax" indication as a new flag in the page vector populated
by mincore.

Can you cc linux-arch when adding new syscalls (or other such things that
need arch enablement).

I wonder if the changelog for a new syscall should have a bit more grandeur.
Without seeing patch 2, you might not know this was a new syscall just by
reading the subject and changelog.

mincore() defines other bits to be reserved, but I guess it probably breaks
things if you suddenly started using them.

It's a bit sad to introduce a new syscall for this and immediately use up
all bits that can be returned. Would it be a serious problem to return a
larger mask per page?

Thanks,
Nick