* Thibault, Daniel (daniel.thiba...@drdc-rddc.gc.ca) wrote:
> I notice that the metadata of per-PID user-space traces has three
> attributes which are dropped from the equivalent per-UID trace:
>
> Per-PID trace:
>
> env {
> hostname = "sds-dut-vb";
> domain = "ust";
> tracer_name = "lttng-ust";
> tracer_major = 2;
> tracer_minor = 3;
> tracer_patchlevel = 0;
> vpid = 7024;
> procname = "simple";
> };
>
> Per-UID trace:
>
> env {
> hostname = "sds-dut-vb";
> domain = "ust";
> tracer_name = "lttng-ust";
> tracer_major = 2;
> tracer_minor = 3;
> };
>
> The trace data are the same in this case (two trace sessions capturing the
> same events in parallel), so this change in metadata only shows up in
> babeltrace's output (when using '-f all -n all' for example).
>
> Is this intentional?
Yes
> It does mean per-UID traces "anonymize" the event data slightly. And why is
> "tracer_patchlevel" dropped alongside the process-related attributes?
Because different processes could use different tracer versions.
Thanks,
Mathieu
>
> Daniel U. Thibault
> Protection des systèmes et contremesures (PSC) | Systems Protection &
> Countermeasures (SPC)
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> Security (MCCS)
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>
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--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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