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

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On Thu, Jan 07, 2016 at 01:56:14PM -0800, Stephane Eranian wrote:
> 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.

If you do that I would rather collect buildid for everything that is synthesized
(everything in /proc)

-Andi

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Re: [RFC] perf record: missing buildid for callstack modules Andi Kleen <ak@linux.intel.com> - 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

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