Re: [RFC] [PATCH 1/1] perf: add support for arch-dependent symbolicevent names to "perf stat"

From: Corey Ashford
Date: Fri Mar 05 2010 - 12:43:13 EST

(I posted this yesterday, but I think LKML rejected it because there was more
quoted text than my text. So I am reposting with no quoted text).

A couple of follow-up comments on this patch:

This functionality was designed to provide a generalized interface to an external event name -> attr struct library, such as libpfm4. libpfm4 has an interface that nearly exactly matches parse_*_event() profiles, so it's quite easy to write a small wrapper function to call libpfm4's function.

Ingo Molnar discussed adding some visibility to the arch-dependent event names through some other interface, such as through /sys/devices/pmus perhaps, but that discussion is a long way (as far as I know) from having something usable today. So you could think of this external library approach to be a stop-gap until something better is developed. When/if that new event naming mechanism becomes available, we can easily remove this external library support from perf.


- Corey

Corey Ashford
Software Engineer
IBM Linux Technology Center, Linux Toolchain
Beaverton, OR

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