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I'm using babeltrace python binding to crate a trace file from some data I have: The data represent system execution information so there are Tasks being created and run.

I am able to display the trace file in Trace Compass: information pops up in the histogram panel.

I would love to have it displayed properly in the Control Flow panel.

I dumped a trace file taken with lttng and I can see that thread info are inside these tags

lttng_statedump_start
lttng_statedump_process_state: { cpu_id = 2 }
lttng_statedump_end

Trace Compass does not show these lines, on the other hand "Control flow" panel displays all threads in the system

an example line:

 [15:31:49.098426008] (+0.000000858) nostromo lttng_statedump_process_state: { cpu_id = 2 }, { tid = 62, vtid = 62, pid = 62, vpid = 62, ppid = 2, vppid = 2, name = "kcompactd0", type = 1, mode = 5, submode = 0, status = 5, ns_level = 0, ns_inum = 4026531836 }

I tried to create a similar stream_class in my python but as you see the cpu_id is empty, and these lines are displayed in Trace compass but nothing pops up in Control Flow panel

[01:00:00.000000012] (+0.000000000) 0 lttng_statedump_process_state: { }, { tid = 12, vtid = 25, pid = 57, vpid = 2382432512, ppid = 0, vppid = 0, name = "ciccio", type = 0, mode = 0, submode = 0, status = 0, ns_level = 0, ns_inum = 0 }
  • How do I set cpu_id?
  • Am I on the good path to get this running?
Guido Roncarolo
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1 Answers1

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The control flow view requires "sched_switch" operations to be populated. Do you have these events enabled in your trace?

If you're looking for faster feedback by the way, look at the community section of www.tracecompass.org.

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Matthew Khouzam
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