Messages in this thread | | | Date | Thu, 11 Mar 2010 12:46:05 -0800 | From | Corey Ashford <> | Subject | Re: [RFC] [PATCH 1/1] perf: add support for arch-dependent symbolic event names to "perf stat" |
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On 3/11/2010 11:14 AM, Ingo Molnar wrote: > > * Corey Ashford<cjashfor@linux.vnet.ibm.com> wrote: [snip] >> 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.
PM_DE_PMC_9:hrd_mask=0xff:hrd=0x22:pma_mask=0x3fff:pma=0x1b2d:culling_mode=3 PM_EX_0x03:lane=2:vlane=1 PM_OWE_ENG_MAC_FULL:usu=3
Note that the attribute fields shown above are fitted into the config field of the perf_event_attr struct.
> > Thanks, > > Ingo
Regards,
- Corey
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