[lttng-dev] Enabling Syscalls LTTng v2.5.1

Dilong Zheng Dilong.Zheng at mitel.com
Thu Jul 9 09:23:09 EDT 2015

Hi Jeremie,

I am attempting to enable syscalls by doing: lttng enable-event -a -k --syscall but I am received a warning: "Warning: Kernel events already enabled". From searching online, I read that the warning is just a UI issue and doesn't actually affect the functionality of LTTng; that the syscalls are actually being enabled. However when viewing the kernel trace inside TraceCompass or Tracealyzer I do barely ever see any system calls. The only syscalls that appear if any are almost always "clone". I am currently using Fedora 22, x86 architecture. Be great to get some insight regarding the warning and what I could be doing better to see syscalls by enabling the event. Thanks for your help.

Dilong Zheng
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