From mboxrd@z Thu Jan 1 00:00:00 1970 From: alexmonthy@voxpopuli.im (Alexandre Montplaisir) Date: Mon, 22 Jun 2015 17:20:35 -0400 Subject: [lttng-dev] LTTng event loglevel In-Reply-To: References: Message-ID: <55887C23.8010306@voxpopuli.im> Hi, On 2015-06-22 05:06 PM, Jeffrey Chen wrote: > Hi: > > I am reading the LTTng and I am confused about the loglevel in the document. The document talked about it could assign a loglevel to each event. (http://lttng.org/docs/#doc-assigning-log-levels) This part refers to when you define your own tracepoints in your pogram, using the TRACEPOINT_EVENT macro. > But, later in the document, it says all events from LTTng are traced as loglevel TRACE_DEBUG_FUNCTION. (http://lttng.org/docs/#doc-liblttng%E2%80%91ust%E2%80%91cyg%E2%80%91profile) That part however, refers to using the liblttng-ust-cyg-profile library, to automatically instrument function entries and exits. This library implements the callbacks expected by cyg-profile, and puts the information into UST tracepoints. Since it's this liblttng-ust-cyg-profile library that "defines" the tracepoints here, they are stuck at the log level specified in their definition, which is TRACE_DEBUG_FUNCTION in this case. Hope this helps, Alexandre