On Thu, 2019-06-27 at 11:41 -0700, Paul E. McKenney wrote: > On Thu, Jun 27, 2019 at 02:16:38PM -0400, Joel Fernandes wrote: > > > > I think the fix should be to prevent the wake-up not based on whether we > > are > > in hard/soft-interrupt mode but that we are doing the rcu_read_unlock() > > from > > a scheduler path (if we can detect that) > > Or just don't do the wakeup at all, if it comes to that. I don't know > of any way to determine whether rcu_read_unlock() is being called from > the scheduler, but it has been some time since I asked Peter Zijlstra > about that. > > Of course, unconditionally refusing to do the wakeup might not be happy > thing for NO_HZ_FULL kernels that don't implement IRQ work. Couldn't smp_send_reschedule() be used instead? -Scott
