[lttng-dev] Trace loss in Lttng

Ranganadh Kanitmahanti ranganadh1991 at yahoo.com
Mon Dec 29 07:19:42 EST 2014

Hi Jeremie,
Thank you, events_discarded may be of some help for us.  Our main requirement is to find the number of discarded events per session
Ex: We use lttng_create_session() to create an session and then enabled certain events using lttng_enable_event(). The events      come  from different processes. 
Now, as a whole, can we get the number of discarded events for the whole session?? 

Thanks &Regards,K.V.Ranganadh.

     On Tuesday, 9 December 2014 10:10 PM, Jérémie Galarneau <jeremie.galarneau at efficios.com> wrote:

 On Tue, Dec 9, 2014 at 12:20 AM, Ranganadh Kanitmahanti
<ranganadh1991 at yahoo.com> wrote:
> Hi,
> I am using Lttng in an application. I have enabled heavy traces and I have
> found that there is a loss in traces.  Is there any way of knowing if there
> is any trace loss or any information regarding about it . Are there any API
> calls to know about them.

There is no way to know from the application while the trace is being
captured. I wonder what form such a mechanism would take to,
basically, query the tracer/ring buffer for the events_discarded
counter... This would arguably be of little use in per-uid mode (since
a user's apps share the same buffer), but I could see this being
useful in per-pid mode.
Any ideas?


> Thanks & Regards.,
> K.V.Ranganadh.
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> lttng-dev mailing list
> lttng-dev at lists.lttng.org
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Jérémie Galarneau
EfficiOS Inc.

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