On Wed, Apr 19, 2017 at 07:47:30AM -0700, Paul E. McKenney wrote: > The RCU expedited primitives have been completely rewritten since then, > and no longer use try_stop_cpus(), no longer disturb idle CPUs, and no > longer disturb nohz_full CPUs running in userspace. In addition, there > is the rcupdate.rcu_normal kernel boot paramter for those who want to > completely avoid RCU expedited primitives. > > So it seems to me to be time for the patch below. Thoughts?
So I forgot all the details again; but if I'm not mistaken it still prods CPUs with IPIs (just not idle/nohz_full CPUs). So its still not ideal to sprinkle them around. Which would still argue against using them too much.
