Hello, On Tue, Dec 13, 2022 at 11:57:12AM +0100, Peter Zijlstra wrote: > > Given that UP doesn't need to transfer tasks across, it might be possible to > > move the whole dispatch operation into ->pick_next_task() but the current > > state would be different, so it's more complicated and will likely be more > > brittle. > > That sounds like something is amiss, you fundamentally hold all the > right locks, there is only one. Yeah, locking is not the problem on UP. It's more that balance() is before put_prev_task() and pick_next_task() after, so the %current task state is different between the two points. I'll see if I can sqaure that from SCX side. I don't see a reason why it wouldn't be possible but it's likely more complicated than adding a call in the same spot for UP. Thanks. -- tejun
