test: ftrace
CPU: Intel(R) Core(TM)2 Duo CPU     E8400  @ 3.00GHz
RAM: 4GB

Started using the command:

	time ./test-ftrace

Where test-ftrace is:

--- cut ---
#!/bin/bash

echo "Testing ftrace - begin"
cd /sys/kernel/debug/tracing

count=0
while test $count -lt 100 ; do
    for tracer in function nop ; do
	echo $tracer >current_tracer
	echo 1 >tracing_on
	echo 0 >tracing_on
    done
    count=$(($count + 1))
done

cd -
echo "Testing ftrace - end"
--- cut ---

and the load was generated using the script make-load:

--- cut ---
#!/bin/bash

a=1
while true ; do
    a=$(($a+1))
done
--- cut ---

Now, results with no load on the system; with the commit c229828ca6bc62d
(rcu: Throttle rcu_try_advance_all_cbs() execution)

real    0m49.393s    0m49.632s    0m49.359
user    0m0.004s     0m0.000s	  0m0.004s
sys     0m0.996s     0m0.880s	  0m0.892s

and with reverted c229828ca6bc62d (rcu: Throttle rcu_try_advance_all_cbs()
execution)

real    0m35.320s    0m35.687s    0m35.920s
user    0m0.004s     0m0.004s	  0m0.000s
sys     0m1.140s     0m1.208s	  0m1.152s

---

Results with 100% load on one CPU and no load on 2nd CPU (started the script
make-load once) with c229828ca6bc62d (rcu: Throttle rcu_try_advance_all_cbs()
execution)

real    0m44.964s    0m45.083s    0m45.171s
user    0m0.000s     0m0.000s	  0m0.004s
sys     0m1.580s     0m1.612s	  0m1.576s

and with reverted c229828ca6bc62d (rcu: Throttle rcu_try_advance_all_cbs()
execution)

real    0m30.816s    0m31.326s    0m31.191s
user    0m0.004s     0m0.004s	  0m0.008s
sys     0m1.240s     0m1.248s	  0m1.232s

---

Results with 100% load on both CPUs (started script make-load twice)
with c229828ca6bc62d (rcu: Throttle rcu_try_advance_all_cbs() execution)

real    0m20.294s    0m20.538s    0m20.470s
user    0m0.004s     0m0.000s	  0m0.000s
sys     0m1.284s     0m1.388s	  0m1.612s

and with reverted c229828ca6bc62d (rcu: Throttle rcu_try_advance_all_cbs()
execution)

real    0m20.305s    0m20.056s    0m20.259
user    0m0.000s     0m0.000s	  0m0.000s
sys     0m1.416s     0m1.452s	  0m1.560s