On Tue 25-08-15 15:03:00, Eric B Munson wrote:
[...]

Would you drop your objections to the VMA flag if I drop the portions of
the patch that expose it to userspace?

The rework to not use the VMA flag is pretty sizeable and is much more
ugly IMO.  I know that you are not wild about using bit 30 of 32 for
this, but perhaps we can settle on not exporting it to userspace so we
can reclaim it if we really need it in the future?

Yes, that would be definitely more acceptable for me. I do understand
that you are not wild about changing mremap behavior.

Anyway, I would really prefer if the vma flag was really used only at
few places - when we are clearing it along with VM_LOCKED (which could
be hidden in VM_LOCKED_CLEAR_MASK or something like that) and when we
decide whether the populate or not (this should be __mm_populate). But
maybe I am missing some call paths where gup is called unconditionally,
I haven't checked that.
-- 
Michal Hocko
SUSE Labs

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