On Mon 06-01-25 22:04:31, Yafang Shao wrote: > On Mon, Jan 6, 2025 at 8:30 PM Michal Hocko <mhocko@xxxxxxxx> wrote: > > > > On Wed 25-12-24 10:23:53, Yafang Shao wrote: > > [...] > > > - Option C: Reparent the mlocked page to a common ancestor > > > > > > Consider the following hierarchical: > > > > > > A > > > / \ > > > B C > > > > > > If B is mlocking a page in C, we can reparent that mlocked page to A, > > > essentially making A the new parent for the mlocked page. > > > > How does this solve the underlying problem? > > No OOM will occur in C until the limit of A is reached, and an OOM at > that point is the expected behavior. Right but if A happens to be the root cgroup then you effectivelly allows mlock to run away a local limit. -- Michal Hocko SUSE Labs
