[lttng-dev] User-space tracing by the root lttng-sessiond

[Mathieu Desnoyers]

* Thibault, Daniel (Daniel.Thibault at drdc-rddc.gc.ca) wrote:
> > >  (Question: If there were several users active at once, would there be 
> > > several root user-space lttng-consumerd daemons or still just one?)
> >
> > no
> 
>    Please clarify: no, there will be several root user-space
>    lttng-consumerd daemons or no, there will be just one root
>    user-space lttng-consumerd daemon?

still just one.

> 
> > >    This seems problematic to me, since multiple traces capturing the same event won't be able to reconcile their copies with each other.
> >
> > since timestamps have to match the event physical order in the streams, we need to assign one timestamp for each buffer. no way around this.
> 
>    Are the time-stamps issued by the tracepoint provider or by the
>    "buffer registrar" (i.e. the time-stamp is looked up when the event
>    is written to the buffer)?

the latter.

Thanks,

Mathieu


> 
> Daniel U. Thibault
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-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com