[lttng-dev] adding new channel

[Anand Neeli]

Well, i can create a new session for this use-case.
But what will be the use of channels if they can be added on the fly.
The dynamic configuration of adding/deleting events and channels wont be
much useful if user has to pre-decide on what config is he going to do.
I hope you get my point on the flexibility here.

Thanks,
Anand Neeli


On Sat, Feb 21, 2015 at 2:24 AM, Julien Desfossez <jdesfossez at efficios.com>
wrote:

> Hi,
>
> I'm just curious, is there a problem with creating new sessions when
> needed for this kind of use-case ?
>
> Thanks,
>
> Julien
>
> On 15-02-20 02:25 PM, Anand Neeli wrote:
> > 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 <mailto:eeppeliteloop at gmail.com>> wrote:
> >
> >     On Fri, Feb 20, 2015 at 2:00 PM, Anand Neeli <anand.neeli at gmail.com
> >     <mailto: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
> >     >
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> >     >
> >
> >
> >
> >
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