From mboxrd@z Thu Jan 1 00:00:00 1970 From: mathieu.desnoyers@efficios.com (Mathieu Desnoyers) Date: Tue, 5 Nov 2013 14:20:01 +0000 (UTC) Subject: [lttng-dev] Tagging traces with arbitrary data (as in custom metadata) In-Reply-To: References: Message-ID: <1726942705.57214.1383661201794.JavaMail.zimbra@efficios.com> ----- Original Message ----- > From: "David Lindstr?m" > To: lttng-dev at lists.lttng.org > Sent: Tuesday, November 5, 2013 9:15:14 AM > Subject: [lttng-dev] Tagging traces with arbitrary data (as in custom > metadata) > Hi, I was wondering if there?s a way to tag a trace with some additional > information. A general example would be to include a description of the > current experiment. One way to do this currently would be to create a custom > lttng-message application with some UST tracepoint and then just log that to > a separate channel, but that would be pretty ugly. It would be much cleaner > to insert extra fields into the metadata stream. Is something like that > possible in current versions of LTTng and/or would it be possible to add it > for a future version? The CTF metadata has an environment (env {}) section that contains this kind of information. LTTng already uses it to store the tracer version and some info about the system. We could eventually add a feature like this, a "tag", that would be added to the CTF environment information. I would guess that users would provide this tag on the lttng command line for their session, and it would be passed to the tracers by sessiond. Thoughts ? Thanks, Mathieu > Mvh > David Lindstr?m > _______________________________________________ > lttng-dev mailing list > lttng-dev at lists.lttng.org > http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev -- Mathieu Desnoyers EfficiOS Inc. http://www.efficios.com -------------- next part -------------- An HTML attachment was scrubbed... URL: