On Tue, Nov 17, 2020 at 06:19:43PM -0500, Joel Fernandes (Google) wrote: > From: Peter Zijlstra <pet...@infradead.org> > > When a sibling is forced-idle to match the core-cookie; search for > matching tasks to fill the core. > > rcu_read_unlock() can incur an infrequent deadlock in > sched_core_balance(). Fix this by using the RCU-sched flavor instead. > ... > + > + if (p->core_occupation > dst->idle->core_occupation) > + goto next; > +
I am unable to understand this check, a comment or clarification in the changelog will help. I presume we are looking at either one or two cpus to define the core_occupation and we expect to match it against the destination CPU. Balbir Singh.
