Hello, On Thu, Jun 20, 2024 at 05:35:45PM -0700, David Rientjes wrote: > As core counts are rapidly expanding over the next four years, Namhyung > and I were looking at global locks that we're already seeing high > contention on even today. > > Some of these are not MM specific: > - cgroup_mutex Our machines are getting bigger but we aren't creating and destroying cgroups frequently enough for this to matter. But yeah, I can see how this can be a problem. > - cgroup_threadgroup_rwsem This one shouldn't matter at all in setups where new cgroups are populated with CLONE_INTO_CGROUP and not migrated further. The lock isn't grabbed in such usage pattern, which should be the vast majority already, I think. Are you guys migrating tasks a lot or not using CLONE_INTO_CGROUP? Thanks. -- tejun
