Hi Tao,
due to lack of financing, the latency_tracker project
(https://github.com/efficios/latency-tracker/) isn't being actively
maintained at this time.
Another option to get information on event latencies is to have
"_entry"- and "_exit"-style events and perform post-processing of the
traces with the Trace Compass Incubator "inandout" plugin.
https://git.eclipse.org/r/plugins/gitiles/tracecompass.incubator/org.eclipse.tracecompass.incubator/+/refs/heads/master/doc/org.eclipse.tracecompass.incubator.inandout.doc.user/doc/User-Guide.mediawiki
On 2023-10-25 02:41, 姜涛 Tao(AD) via lttng-dev wrote:
Hi everyone, I have read this blog:
https://lttng.org/blog/2016/01/06/monitoring-realtime-latencies/
<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 描述已自动生成
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.
This appears to be a fork of the latency_tracker project. We're not in a
position to offer support for any changes that have been made there.
I also create the issue on the github:
https://github.com/adel-belkhiri/span-latency-tracker/issues/1
<https://github.com/adel-belkhiri/span-latency-tracker/issues/1>.
Any help will be appreciated! Thanks!
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thanks,
kienan
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