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SubjectRe: [RFC] [PATCH 1/1] perf: add support for arch-dependent symbolic event names to "perf stat"

On 3/11/2010 11:14 AM, Ingo Molnar wrote:
> * Corey Ashford<> wrote:
>> I'm not sure how that would work. The issue I am trying to solve
>> here is that Power arch chips have a large number of very
>> hardware-specific events that are not generalizable. Many of these
>> events not only have names, but other user-configurable bits as well
>> that select or narrow the scope of which exact events are recorded.
>> This issue is dealt with nicely in libpfm4, as it has mechanisms for
>> parsing event names and attributes (aka modifiers or unit masks),
>> and then produces a usable config field for the perf_events_attr
>> struct.
>> Should I take it from the above that you are completely against the
>> idea of using an external library for hardware-specific event and
>> attribute naming?
> Could you give a few relevant examples of events in question, and the kind of
> configurability/attributes they have on Power?

Here are a few examples for the Power A2 processor. I've distorted the names
because PMU architecture isn't publicly released yet.


Note that the attribute fields shown above are fitted into the config field of
the perf_event_attr struct.

> Thanks,
> Ingo


- Corey

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