[lttng-dev] Need help: Kernel tracer not available and can't find the lttng-probe-latency_tracker

姜涛 Tao(AD) tao.jiang at jiduauto.com
Wed Oct 25 02:41:56 EDT 2023

Hi everyone, I have read this blog: https://lttng.org/blog/2016/01/06/monitoring-realtime-latencies/, and I think latency_tracker project will be very useful in resovling my problem under linux rt patch kernel 5.10, but it doesn't support linux newer kernel, so I find the span-latency-tracker project later. But when I use lttng create session, I get the error :
Error: Event wakeup_latency: Kernel tracer not available (channel channel0, session auto-20231024-134242)
Error: Event block_latency: Kernel tracer not available (channel channel0, session auto-20231024-134242)
[文本  描述已自?生成]
And I find this tip: "To use the tracepoints provided by this module with LTTng, you first have to connect LTTng probes to them. A patch ready to be applied to the last lttng-modules is provided in extras/<https://github.com/adel-belkhiri/span-latency-tracker/blob/master/extras>. When installed, compiled, load the new probe module with modprobe lttng-probe-latency_tracker", but I can't find the "lttng-probe-latency_tracker" module in the lttng-module compiled modules or in the span-latency-tracker compiled modules.
I also create the issue on the github: https://github.com/adel-belkhiri/span-latency-tracker/issues/1.
Any help will be appreciated! Thanks!
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