On Sat, Apr 10, 2021 at 11:04:54AM +0200, Thomas Gleixner wrote: > On Fri, Apr 02 2021 at 15:49, paulmck wrote: > > From: "Paul E. McKenney" <paul...@kernel.org> > > > > Although smp_call_function() has the advantage of simplicity, using > > it to check for cross-CPU clock desynchronization means that any CPU > > being slow reduces the sensitivity of the checking across all CPUs. > > And it is not uncommon for smp_call_function() latencies to be in the > > hundreds of microseconds. > > > > This commit therefore switches to smp_call_function_single(), so that > > delays from a given CPU affect only those measurements involving that > > particular CPU. > > Is there any reason I'm missing why this is not done right in patch 3/5 > which introduces this synchronization check?
None at all. I will merge this into 3/5. Thanx, Paul