On Thu 05-05-16 00:45:45, Joonsoo Kim wrote: > 2016-05-05 0:30 GMT+09:00 Joonsoo Kim <js1304@xxxxxxxxx>: > > 2016-05-04 18:21 GMT+09:00 Michal Hocko <mhocko@xxxxxxxxxx>: > >> On Wed 04-05-16 11:14:50, Joonsoo Kim wrote: > >>> On Tue, May 03, 2016 at 10:53:56AM +0200, Michal Hocko wrote: > >>> > On Tue 03-05-16 14:23:04, Joonsoo Kim wrote: > >> [...] > >>> > > Memory saving looks as following. (Boot 4GB memory system with page_owner) > >>> > > > >>> > > 92274688 bytes -> 25165824 bytes > >>> > > >>> > It is not clear to me whether this is after a fresh boot or some workload > >>> > which would grow the stack depot as well. What is a usual cap for the > >>> > memory consumption. > >>> > >>> It is static allocation size after a fresh boot. I didn't add size of > >>> dynamic allocation memory so it could be larger a little. See below line. > >>> > > >>> > > 72% reduction in static allocation size. Even if we should add up size of > >>> > > dynamic allocation memory, it would not that big because stacktrace is > >>> > > mostly duplicated. > >> > >> This would be true only if most of the allocation stacks are basically > >> same after the boot which I am not really convinced is true. But you are > >> right that the number of sublicates will grow only a little. I was > >> interested about how much is that little ;) > > > > After a fresh boot, it just uses 14 order-2 pages. > > I missed to add other information. Even after building the kernel, > it takes 20 order-2 pages. 20 * 4 * 4KB = 320 KB. Something like that would be useful to mention in the changelog because measuring right after the fresh boot without any reasonable workload sounds suspicious. -- Michal Hocko SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>