On Mon 14-01-19 16:54:02, Harrosh, Boaz wrote: > Michal Hocko <mhocko@xxxxxxxxxx> wrote: [...] > >> We run with our own compiled Kernel on various distros, THP is configured > >> in but mmap against /dev/shm/ never gives me Huge pages. Does it only > >> work with unanimous mmap ? (I think it is mount dependent which is not > >> in the application control) > > > > If you are talking about THP then you have to enable huge pages for the > > mapping AFAIR. > > This is exactly what I was looking to achieve but was not able to do. Most probably > a stupid omission on my part, but just to show that it is not that trivial and strait > out-of-the-man-page way to do it. (Would love a code snippet if you ever wrote one?) Have you tried mount -t tmpfs -o huge=always none $MNT_POINT ? It is true that man pages are silent about this but at least Documentation/admin-guide/mm/transhuge.rst has an information. Time to send a patch to man pages I would say. -- Michal Hocko SUSE Labs
