[lttng-dev] Adding thread timestamp to event context

[Alok Priyadarshi]

Thanks for your prompt response Mathieu. Can I expect this to happen
soonish?


On Thu, Oct 25, 2018 at 6:02 AM Mathieu Desnoyers <
mathieu.desnoyers at efficios.com> wrote:

> ----- On Oct 24, 2018, at 11:05 PM, Alok Priyadarshi <alokpr at gmail.com>
> wrote:
>
> I am trying to add a thread timestamp to trace events. By thread timestamp
> I mean the value returned by clock_gettime(CLOCK_THREAD_CPUTIME_ID):
> https://linux.die.net/man/3/clock_gettime
>
> I could do this by creating custom events, but I am wondering if there is
> already a way to add this information to event context. I have tried using
> the following arguments to lttng-add-context, but none of them add any
> additional information:
> perf:cpu:cpu-cycles
> perf:cpu:cycles
> perf:thread:cpu-cycles
> perf:thread:cycles
>
> Note that I have only enabled userspace events. I use the following
> sequence of commands to capture trace:
> lttng create
> lttng enable-event --userspace --all
> lttng add-context --userspace -t vpid -t vtid -t perf:thread:cycles
> lttng start
> lttng stop
>
> We would need to extend lttng-ust implementation and lttng-tools to add
> those
> additional contexts. It would make sense to add these.
>
> Thanks,
>
> Mathieu
>
>
>
>
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>
>
> --
> Mathieu Desnoyers
> EfficiOS Inc.
> http://www.efficios.com
>
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