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Re: [RFC] perf record: missing buildid for callstack modules

From Arnaldo Carvalho de Melo <acme@kernel.org>
Newsgroups linux.kernel
Subject Re: [RFC] perf record: missing buildid for callstack modules
Date 2016-01-08 00:50 +0100
Message-ID <qOstA-6LL-11@gated-at.bofh.it> (permalink)
References <qOqLa-5yd-45@gated-at.bofh.it> <qOqLa-5yd-51@gated-at.bofh.it> <qOqUO-5Sw-25@gated-at.bofh.it> <qOsae-6CB-27@gated-at.bofh.it>
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Em Fri, Jan 08, 2016 at 07:47:03AM +0900, Namhyung Kim escreveu:
> On January 8, 2016 7:00:35 AM GMT+09:00, Stephane Eranian <eranian@google.com> wrote:
> >On Thu, Jan 7, 2016 at 1:59 PM, Arnaldo Carvalho de Melo
> ><acme@kernel.org> wrote:
> >> Em Thu, Jan 07, 2016 at 01:56:14PM -0800, Stephane Eranian escreveu:
> >>> Hi,
> >>>
> >>> Whenever you do:
> >>>
> >>>     $ perf record -g -a sleep 10
> >>>
> >>> Perf will collect the callstack for each sample. At the end of the
> >>> run, perf record
> >>> adds the buildid for all dso with at least one sample. But when it
> >does this, it
> >>> only looks at the sampled IP and ignore the modules traversed by the
> >callstack.
> >>> That means that, it is not possible to uniquely identify the modules
> >executed,
> >>> unless they had at least one IP sample captured. But this is not
> >>> always the case.
> >>>
> >>> How about providing an option to perf record to force collecting
> >>> buildid for all IPs
> >>> captured in the callstack? I understand that would cost more at the
> >end of the
> >>> collection, but this would be beneficial to several monitoring
> >scenarios.
> >>
> >> I agree, would consider applying a patch that provides the option but
> >> does not do this by default.
> >>
> >I agree, not the default.
> 
> Hi Stephane,
> 
> Please see
> 
> https://lkml.org/lkml/2015/3/22/249


Oops, Stephane, please try this, so that we can finally merge it :-\

- Arnaldo

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Re: [RFC] perf record: missing buildid for callstack modules Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-07 23:00 +0100
  Re: [RFC] perf record: missing buildid for callstack modules Stephane Eranian <eranian@google.com> - 2016-01-07 23:10 +0100
    Re: [RFC] perf record: missing buildid for callstack modules Namhyung Kim <namhyung@gmail.com> - 2016-01-08 00:30 +0100
      Re: [RFC] perf record: missing buildid for callstack modules Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-08 00:50 +0100
        Re: [RFC] perf record: missing buildid for callstack modules Stephane Eranian <eranian@google.com> - 2016-01-08 19:10 +0100
          Re: [RFC] perf record: missing buildid for callstack modules Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-08 19:20 +0100
            Re: [RFC] perf record: missing buildid for callstack modules Peter Zijlstra <peterz@infradead.org> - 2016-01-11 18:40 +0100
              Re: [RFC] perf record: missing buildid for callstack modules Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-11 19:30 +0100
                Re: [RFC] perf record: missing buildid for callstack modules Stephane Eranian <eranian@google.com> - 2016-01-11 21:10 +0100
              Re: [RFC] perf record: missing buildid for callstack modules Ingo Molnar <mingo@kernel.org> - 2016-01-12 11:50 +0100
                Re: [RFC] perf record: missing buildid for callstack modules Peter Zijlstra <peterz@infradead.org> - 2016-01-12 12:40 +0100
                Re: [RFC] perf record: missing buildid for callstack modules Ingo Molnar <mingo@kernel.org> - 2016-01-12 13:20 +0100
                Re: [RFC] perf record: missing buildid for callstack modules Peter Zijlstra <peterz@infradead.org> - 2016-01-12 14:50 +0100
                Re: [RFC] perf record: missing buildid for callstack modules Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-12 15:40 +0100
                Re: [RFC] perf record: missing buildid for callstack modules Peter Zijlstra <peterz@infradead.org> - 2016-01-12 16:40 +0100
                Re: [RFC] perf record: missing buildid for callstack modules Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-12 16:50 +0100
                Re: [RFC] perf record: missing buildid for callstack modules Peter Zijlstra <peterz@infradead.org> - 2016-01-12 17:20 +0100
                Re: [RFC] perf record: missing buildid for callstack modules Peter Zijlstra <peterz@infradead.org> - 2016-01-12 17:30 +0100
                Re: [RFC] perf record: missing buildid for callstack modules Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-12 18:20 +0100
                Re: [RFC] perf record: missing buildid for callstack modules Ingo Molnar <mingo@kernel.org> - 2016-01-13 11:30 +0100
                Re: [RFC] perf record: missing buildid for callstack modules Peter Zijlstra <peterz@infradead.org> - 2016-01-13 13:50 +0100
                Re: [RFC] perf record: missing buildid for callstack modules Ingo Molnar <mingo@kernel.org> - 2016-01-14 12:30 +0100
                Re: [RFC] perf record: missing buildid for callstack modules Peter Zijlstra <peterz@infradead.org> - 2016-01-14 12:40 +0100
                Re: [RFC] perf record: missing buildid for callstack modules Stephane Eranian <eranian@google.com> - 2016-01-15 03:00 +0100
                Re: [RFC] perf record: missing buildid for callstack modules Peter Zijlstra <peterz@infradead.org> - 2016-01-15 10:40 +0100
                Re: [RFC] perf record: missing buildid for callstack modules Stephane Eranian <eranian@google.com> - 2016-01-12 22:10 +0100
                Re: [RFC] perf record: missing buildid for callstack modules One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-01-12 14:10 +0100
                Re: [RFC] perf record: missing buildid for callstack modules Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-12 15:40 +0100
                Re: [RFC] perf record: missing buildid for callstack modules Peter Zijlstra <peterz@infradead.org> - 2016-01-12 16:40 +0100
                Re: [RFC] perf record: missing buildid for callstack modules Ingo Molnar <mingo@kernel.org> - 2016-01-13 11:30 +0100
                Re: [RFC] perf record: missing buildid for callstack modules Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-12 15:30 +0100
                Re: [RFC] perf record: missing buildid for callstack modules Ingo Molnar <mingo@kernel.org> - 2016-01-13 11:00 +0100
                Re: [RFC] perf record: missing buildid for callstack modules Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-13 16:30 +0100
          Re: [RFC] perf record: missing buildid for callstack modules Namhyung Kim <namhyung@kernel.org> - 2016-01-09 11:40 +0100
            Re: [RFC] perf record: missing buildid for callstack modules Adrian Hunter <adrian.hunter@intel.com> - 2016-01-11 10:40 +0100
              Re: [RFC] perf record: missing buildid for callstack modules Namhyung Kim <namhyung@kernel.org> - 2016-01-11 12:10 +0100
                Re: [RFC] perf record: missing buildid for callstack modules Adrian Hunter <adrian.hunter@intel.com> - 2016-01-11 13:00 +0100

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