[lttng-dev] beginner question

Loris Degioanni loris.degioanni at gmail.com
Sat May 5 01:06:37 EDT 2012

First of all, that worked. Thank you.

So let's suppose I only want to track a handful of system calls, what's 
the most efficient way to filter out everything else?


On 5/4/2012 9:42 PM, Julien Desfossez wrote:
> Hi,
> On 05/05/12 12:14 AM, Loris Degioanni wrote:
>> I just installed the lttng package on a fresh Ubuntu 12 machine, and I'm
>> following the tutorial at http://lttng.org/quickstart.
>> The enable-event step fails with this error:
>> # lttng enable-event sched_switch,sys_open -k
>> kernel event sched_switch created in channel channel0
>> Error: Event sys_open: Enable kernel event failed (channel channel0,
>> session mysession)
>> Warning: Some command(s) went wrong
>> What am I doing wrong?
> As of now, you can't enable system calls tracing one by one (sys_open is
> a system call), it's either all of them or none.
> So if you want sched_switch and all the syscalls you have to do :
> lttng enable-event -k sched_switch
> lttng enable-event -k --syscall -a
> Have fun,
> Julien

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