Using perf to monitor raw event counters

Question

I am trying to measure certain hardware events on a (Intel Xeon) machine with multiple (physical) processors. Specifically, I wish to know how many requests are issued for readi

Answer 1

It seems you can use as well:

perf record -e cpu/event=0xB1,umask=0x1/u ./mytestapp someargs

I don't know where this syntax is documented.

You can probably use the other arguments (edge, inv, cmask) as well.