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    SubjectRe: [PATCH 01/17] perf util: Save pid-cmdline mapping into tracing header
    Em Wed, Jul 31, 2013 at 09:51:54AM +0900, Namhyung Kim escreveu:
    > 2013-07-30 오후 10:28, Arnaldo Carvalho de Melo 쓴 글:
    > >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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