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

[Arnaldo Carvalho de Melo]

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.

- Arnaldo