We'd better keep the record/report function, sometimes, we can only get perf.data
from the customers whose machine can not be reached for us.
Especially, other tracepoints are also interesting for us when the customers encounter
the performance issue, we always ask costumes to use "perf kvm stat -e xxx" to append
other events, like lock:*. Then, we can get not only the information of kvm events
by using 'perf kvm stat' but also other informations like 'perf lock' or 'perf script'
to get the whole sequences.
And, i think "live mode" is also useful for 'perf lock/sched', could you implement it
in perf core?
By the way, the new version of our patchset is ready, do you want to add your implement
after it is accepted by Arnaldo? Or are you going to post it with our patchset together?