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

From	Namhyung Kim <namhyung@gmail.com>
Newsgroups	linux.kernel
Subject	Re: [RFC] perf record: missing buildid for callstack modules
Date	2016-01-08 00:30 +0100
Message-ID	<qOsae-6CB-27@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>
Organization	linux.* mail to news gateway

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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

Thanks,
Namhyung

-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.

Thread

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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