On Mon, Jan 15, 2018 at 10:43:18AM +0100, Peter Zijlstra wrote: > On Tue, Jan 02, 2018 at 03:44:57PM +0000, Morten Rasmussen wrote: > > > Vincent already proposed, why can't we just modify Brendan's > > CPU_NEWLY_IDLE proposal to do a stats update from idle_balance() every > > 32ms regardless of whether we need to load-balance? > > I think that code is there, no? > > Subject: sched: Update blocked load from NEWIDLE
The mechanics are there, but I think the problem is that the idle_balance() bails out before we get to it in some cases. If we only have a few small periodic tasks running rd->overload won't be set and idle_balance() returns before doing anything. We would need some sort of check to see if a PELT update is due and make sure it happens, even if idle_balance() has nothing to do.
