On 02/20/2015 02:05 PM, Philippe Proulx wrote:
On Fri, Feb 20, 2015 at 2:00 PM, Anand Neeli <[email protected]> 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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