On Fri, Jun 17, 2016 at 4:03 PM, Peter Zijlstra <pet...@infradead.org> wrote: > On Fri, Jun 17, 2016 at 06:16:51AM -0700, Paul E. McKenney wrote: >> > Paul, Peter, any ideas about what may be going on here? >> >> Looks to me like this commit moved some code from synchronize_rcu() to >> synchronize_sched(). Assuming that this is a CONFIG_PREEMPT=y system, >> might there have been a decrease in the wakeups from the rcu_preempt >> kthread? > > The 'funny' thing is though; those synchronize thingies are only reached > when we change cpufreq policy, so things like: > > for i in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor ; do echo > performance > $i ; done
Or if you change min or max for a policy and the driver is intel_pstate. > Something which is hardly possible when idle. Weird. Well, exactly. Jisheng, do you use intel_pstate or acpi-cpufreq as the scaling driver?
