On Wed, May 25, 2022 at 10:24:55AM +0200, Michal Hocko wrote: > I am not so sure about the global "never" policy, though. The global > policy controls _kernel_ driven THPs. As the request to collapse memory > comes from the userspace I do not think it should be limited by the > kernel policy. I also think it can be beneficial to implement userspace > based THP policies and exclude any kernel interference and that could be > achieved by global kernel "never" policy and implement the whole > functionality by process_madvise. I'd prefer to see "never" mean "Don't run khugepaged" rather than "Do not create THPs". If the app explicitly asks for a THP, I think it should get one, regardless of the sysadmin's will. Death to tunables. Can we just delete /sys/kernel/mm/transparent_hugepage/shmem_enabled entirely?
