Messages in this thread | | | Date | Thu, 7 Jan 2016 13:56:14 -0800 | Subject | [RFC] perf record: missing buildid for callstack modules | From | Stephane Eranian <> |
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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.
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