[lttng-dev] adding new channel

[Anand Neeli]

Thanks for the reply.

I think adding channels on the fly must be supported.
>From debugging point of view, it will be good if we can add channels on the
fly with each channel having different set of events.
Even "stop tracing" and adding channel doesnt help now.

Thanks,
Anand Neeli

On Sat, Feb 21, 2015 at 12:35 AM, Philippe Proulx <eeppeliteloop at gmail.com>
wrote:

> On Fri, Feb 20, 2015 at 2:00 PM, Anand Neeli <anand.neeli at gmail.com>
> wrote:
> > Hi All,
> > Is adding a new channel to an existing(running) session supported?
>
> No.
> >
> > i get following error when doing this.
> > Error: Channel myc5: Tracing already started
> >
> > Is there any way to add channels on the fly?
>
> No. LTTng's documentation [1] states:
>
>     Note: Because of a current limitation, all channels must be
>     created prior to beginning tracing in a given tracing session,
>     i.e. before the first time you do lttng start.
>
>     Since a channel is automatically created by enable-event
>     only for the specified domain, you cannot, for example, enable
>     a kernel domain event, start tracing and then enable a user
>     space domain event because no user space channel exists
>     yet and it's too late to create one.
>
>     For this reason, make sure to configure your channels
>     properly before starting the tracers for the first time!
>
> Phil
>
> [1] http://lttng.org/docs/#doc-enabling-disabling-channels
>
> > I'm using 2.4.1 version
> >
> > Thanks,
> > Anand Neeli
> >
> > _______________________________________________
> > lttng-dev mailing list
> > lttng-dev at lists.lttng.org
> > http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
> >
>
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