On 10/5/22 18:01, Florent Carli wrote: > Hello, > > I'm trying to isolate some cores to run a CPU-bound real-time task and > even though I'm using rcu_nocbs and rcu_nocb_poll, I can see the rcuc > threads wake up, and I get RCU stall warnings on the isolated core. > As per the documentation, if I use rcutree.kthread_prio with a > priority > my RT task, then the rcu stall does not happen. > > However I find it confusing: why are the rcuc threads woken up on the > isolated cores despite using rcu_nocbs and rcu_nocb_poll? In my (very > likely erroneous) understanding, I shouldn't have to fiddle with rcu > priority... In other words, how come I get rcu stalls on cores that > have no rcu callbacks? Adding Joel because we had a chat about it during lpc... > Thanks. > -- Daniel
