On Thu, Oct 29, 2020 at 09:04:48AM -0700, Paul E. McKenney wrote: > On Thu, Oct 29, 2020 at 10:10:53AM +0100, Peter Zijlstra wrote:
> > Dang, clearly TREE01 didn't actually hit any of this code :/ Is there > > another test I should be running? > > TREE01 is fine, but you have to tell rcutorture to actually generate an > RCU CPU stall warning. Like this for a 25-second stall with interrupts > disabled: > > tools/testing/selftests/rcutorture/bin/kvm.sh --allcpus --duration 3 > --configs "10*TREE04" --bootargs "rcutorture.stall_cpu=25 > rcutorture.stall_cpu_irqsoff=1" --trust-make > Of course, to test your change, you also need the grace-period kthread to > migrate to the stalled CPU just after interrupts are enabled. For this, > you need something like an 11-second stall plus something to move the > grace-period kthread at the right (wrong?) time. Or just run the above > commands in a loop on a system with ample storage over night or some such. > I see about 70MB of storage per run, so disk size shouldn't be too much > of a problem. Thanks!, I'll make the above run over night in a loop.
