On 10/15/12 8:55 AM, Robert Richter wrote:
[..]
Perf tool works then out-of-the-box with:
$ perf record -e cpu/stalled-cycles-fixed-point/ ...
The event string can easily be reused by other architectures as a
quasi standard.
I like Robert's proposal better. It's hard to model all the stall events (eg: instruction decoder related stalls on x86) in a hardware independent way.
Another area to think about: software engineers are generally busy and have a limited amount of time to devote to hardware event based optimizations. The most common question I hear is: what is the expected perf gain if I fix this? It's hard to answer that with just the stall events.
-Arun