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. > > > 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?
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