[lttng-dev] adding new channel

[Alexandre Montplaisir]

On 02/20/2015 02:05 PM, Philippe Proulx 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.

The wording "Because of a current limitation" seems to imply that it 
could and will eventually be rectified. It this actually the case, or is 
the doc just giving the user false hope? ;)


Alex

>
>      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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