perf top : failed to mmap with 22 (invalid argument)

Question

How to use --mmap-pages option from perf-top ?

This is not working :

~> perf top --stdio -K -e cpu-clock:u,cache-misses:u -p 1234
Error:
Failed to mmap with 22 (Invalid argument)

But, all of these are working OK :

~> perf top --stdio -K -e cpu-clock:u,cache-misses:u
...

~> perf top --stdio -K -e cpu-clock:u -p 1234
...

~> perf top --stdio -K -e cpu-clock:u
...

~> perf top --stdio -K -e cache-misses:u
...

~> perf top --stdio -K -e cache-misses:u -p 1234
...

FGH

PS : I am running debian

~> uname -r
4.6.0-1-amd64

UPDATE

~> cat /proc/sys/kernel/perf_event_paranoid
-1
~> more /etc/sysctl.conf | grep paranoid
kernel.perf_event_paranoid = -1

UPDATE

For the record, I guess perf-top can handle only one event :

~> man perf-top
       -e <event>, --event=<event>
           Select the PMU event.
                  ---