Re: [PATCH 01/17] perf util: Save pid-cmdline mapping into tracingheader

[Arnaldo Carvalho de Melo]

Em Wed, Jul 31, 2013 at 09:51:54AM +0900, Namhyung Kim escreveu:
> 2013-07-30 ìí 10:28, Arnaldo Carvalho de Melo ì ê:
> >Em Tue, Jul 30, 2013 at 06:18:58PM +0900, Namhyung Kim escreveu:
> >>Current trace info data lacks the saved cmdline mapping which is
> >>needed for pevent to find out the comm of a task.  Add this and bump
> >>up the version number so that perf can determine its presence when
> >>reading.

> >Can't we get this from the PERF_RECORD_COMM synthesized at the beginning
> >of the session + the kernel generated ones for new threads?

> >We would just call machine__find_thread() and use thread->comm, etc, no?

> Yes, I think it's doable.  However it needs an additional perf event
> only to generate the COMM events.  So I decided not to do it and

I don't think this is a problem, its in line with Ingo's suggestion of a
new perf ioctl to ask the kernel to generate PERF_RECORD_MMAP events for
existing threads.

- Arnaldo
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