Matthew Wilcox, on jeu. 13 avril 2017 09:34:11 -0700, wrote: > On Thu, Apr 13, 2017 at 06:29:46PM +0200, Samuel Thibault wrote: > > (Ideally we'd be able to take the MAP_HUGETLB mmap flag into account to > > map a single huge page repeatedly, even lowering the populating cost, > > but AIUI of the current hugepage support it would be far from easy) > > You could implement ->map_pages instead of (or as well as) ->fault, which > would lower your costs if that is a concern.
Yes it is a concern. I was a bit afraid that implementing map_pages would be frowned upon, and getting in first a simple yet already useful /dev/garbage would work better :) I'm fine with doing either. > I think the eventual intent is that map_pages would be able to > populate a PMD or even a PUD. Yes. Allocating such a big page can be a problem, though. Samuel
