Messages in this thread | | | Date | Mon, 15 Oct 2012 10:23:10 -0700 | From | Arun Sharma <> | Subject | Re: [RFC][PATCH] perf: Add a few generic stalled-cycles events |
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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
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