Re: [PATCH v7 3/6] mm: Introduce VM_LOCKONFAULT

[Michal Hocko <mhocko-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>]

On Thu 20-08-15 13:03:09, Eric B Munson wrote:
> On Thu, 20 Aug 2015, Michal Hocko wrote:
> 
> > On Wed 19-08-15 17:33:45, Eric B Munson wrote:
> > [...]
> > > The group which asked for this feature here
> > > wants the ability to distinguish between LOCKED and LOCKONFAULT regions
> > > and without the VMA flag there isn't a way to do that.
> > 
> > Could you be more specific on why this is needed?
> 
> They want to keep metrics on the amount of memory used in a LOCKONFAULT
> region versus the address space of the region.

/proc/<pid>/smaps already exports that information AFAICS. It exports
VMA flags including VM_LOCKED and if rss < size then this is clearly
LOCKONFAULT because the standard mlock semantic is to populate. Would
that be sufficient?

Now, it is true that LOCKONFAULT wouldn't be distinguishable from
MAP_LOCKED which failed to populate but does that really matter? It is
LOCKONFAULT in a way as well.

> > > Do we know that these last two open flags are needed right now or is
> > > this speculation that they will be and that none of the other VMA flags
> > > can be reclaimed?
> > 
> > I do not think they are needed by anybody right now but that is not a
> > reason why it should be used without a really strong justification.
> > If the discoverability is really needed then fair enough but I haven't
> > seen any justification for that yet.
> 
> To be completely clear you believe that if the metrics collection is
> not a strong enough justification, it is better to expand the mm_struct
> by another unsigned long than to use one of these bits right?

A simple bool is sufficient for that. And yes I think we should go with
per mm_struct flag rather than the additional vma flag if it has only
the global (whole address space) scope - which would be the case if the
LOCKONFAULT is always an mlock modifier and the persistance is needed
only for MCL_FUTURE. Which is imho a sane semantic.
-- 
Michal Hocko
SUSE Labs