On Fri, Nov 27, 2020 at 04:02:53PM +0100, Michal Hocko wrote: > It should also require a tunable (kernel parameter for now but maybe we > will need a more fine grained control later) to enable this explicitly. > Earlier discussions have pointed out that allocating vmemmap from each > section can lead to a sparse memory unsuitable for very large pages. > So I believe this should be an opt in.
Yeah, I already had that in mind, just did not get to implement it in this RFC yet as I was more focused on the implementation per se. I thought about a tunable in /sys/device/system/memory/[file], but a kernel command line boot option would also work and for the first implementation would be less for a hassel. > Also is there any reason why this cannot be a preparatory patch for the > actual implementation? It would look more natural that way to me. I guess you are right, will re-order it in a future submission. -- Oscar Salvador SUSE L3
