Hi, can we retrieve kernel data structures addresses or contents using LTTng ?
regards. 2013/6/23 Mathieu Desnoyers <[email protected]> > * Jessica Foest ([email protected]) wrote: > > Hi, > > i tried to apply kprobe to a system call , so i used probe and function > > option : > > > > lttng enable-event aname -k --probe sys_open+0x0 > > this command returns ip value > > > > lttng enable-event aname -k --function sys_open > > this command returns ip and parent_ip values . > > > > what does these values ip and parent_ip means ? > > ip: instruction pointer of the function, > parent_ip: instruction pointer of the caller. > > > > > I try to apply probe and function options to some kernel symbols like > > initialized date (like xen_vcpu_info symbol), read only data (like > > linux_prob_banner symbol) and code (like reserve_ebda_region symbol) it > > displays to me : Enable kernel event failed ,warning some command went(s) > > wrong. > > Did i make a mistake or it's a limitation in LTTng ? > > It's kprobes: you can only add breakpoints to code, not data. > > Thanks, > > Mathieu > > > regards. > > > _______________________________________________ > > lttng-dev mailing list > > [email protected] > > http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev > > > -- > Mathieu Desnoyers > EfficiOS Inc. > http://www.efficios.com > > _______________________________________________ > lttng-dev mailing list > [email protected] > http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev >
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