On Tue, Oct 08, 2024 at 03:44:23PM -0400, Waiman Long wrote: > > On 10/8/24 1:38 PM, Peter Zijlstra wrote: > > On Tue, Oct 08, 2024 at 04:22:26PM +0100, Juri Lelli wrote: > > > Does this report make any sense? If it does, has this issue ever been > > > reported and possibly discussed? I guess it’s kind of a corner case, but > > > I wonder if anybody has suggestions already on how to possibly try to > > > tackle it from a kernel perspective. > > Any shared lock can cause such havoc. Futex hash buckets is just one of > > a number of very popular ones that's relatively easy to hit. > > > > I do have some futex-numa patches still pending, but they won't > > magically sure this either. Userspace needs help at the very least. > > Regarding the futex-numa patches, are you planning to get them merged soon? > We have customers asking for that. They're on the todo list somewhere... I know Ampere had interest, other than that nobody really said anything.
