Adding thread timestamp to event context

Adding thread timestamp to event context

[Alok Priyadarshi]

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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

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Re: Adding thread timestamp to event context

[Mathieu Desnoyers]

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You are the first to show interest in this. It is not on our roadmap for the moment. 

Thanks, 

Mathieu 

----- On Oct 25, 2018, at 10:33 PM, Alok Priyadarshi <alokpr@gmail.com> wrote: 

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

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

>> ----- On Oct 24, 2018, at 11:05 PM, Alok Priyadarshi < [ mailto:alokpr@gmail.com
>> | alokpr@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 |
>>> 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

>>> _______________________________________________
>>> lttng-dev mailing list
>>> [ mailto:lttng-dev@lists.lttng.org | lttng-dev@lists.lttng.org ]
>>> [ https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev |
>>> https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev ]

>> --
>> Mathieu Desnoyers
>> EfficiOS Inc.
>> [ http://www.efficios.com/ | http://www.efficios.com ]

-- 
Mathieu Desnoyers 
EfficiOS Inc. 
http://www.efficios.com 

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Re: Adding thread timestamp to event context

[Alok Priyadarshi]

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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@efficios.com> wrote:

> ----- On Oct 24, 2018, at 11:05 PM, Alok Priyadarshi <alokpr@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
>
>
>
>
> _______________________________________________
> lttng-dev mailing list
> lttng-dev@lists.lttng.org
> https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
>
>
> --
> Mathieu Desnoyers
> EfficiOS Inc.
> http://www.efficios.com
>

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Re: Adding thread timestamp to event context

[Mathieu Desnoyers]

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----- On Oct 24, 2018, at 11:05 PM, Alok Priyadarshi <alokpr@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 |
> 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 

> _______________________________________________
> lttng-dev mailing list
> lttng-dev@lists.lttng.org
> https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev

-- 
Mathieu Desnoyers 
EfficiOS Inc. 
http://www.efficios.com 

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