On Thu, Feb 23, 2023 at 02:10:56PM -0400, Jason Gunthorpe wrote: > > I am not familiar with memfd, but based on > > mem_cgroup_swapin_charge_folio() it seems like if cgroup B swapped in > > the pages they will remain charged to cgroup A, unless cgroup A is > > removed/offlined. Am I missing something? > > Ah, I don't know, Tejun said: > > "but it can converge when page usage transfers across cgroups > if needed." > > Which I assumed was swap related but I don't know how convergence > works. That'd work for pagecache. For swap-backed, I think Yosry is right. Is MAP_SHARED | MAP_ANONYMOUS a concern? Such mappings can only be shared through forking, so it's not a common thing to be shared across different resource domains. Thanks. -- tejun
