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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">I’m trying to use LTTng on a Red Hat Enterprise Linux 7.9 (with the real time kernel patch).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I installed LTTng on the machine following the EfficiOS guide linked by lttng official website.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">In my configuration, lttng manages to record user space events.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I’d like to record also kernel space events, so I’m following the quickstart guide on the website.<o:p></o:p></span></p>
<pre style="line-height:11.25pt;vertical-align:baseline"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">As soon as I run</span><span lang="EN-US"> </span><span lang="EN-US" style="font-family:Consolas">“</span><span lang="EN-US" style="font-size:9.0pt;font-family:Consolas">lttng list –-kernel”</span><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">, I obtain the error:<o:p></o:p></span></pre>
<pre style="line-height:11.25pt;vertical-align:baseline"><span lang="EN-US" style="font-size:9.0pt;font-family:Consolas"><o:p> </o:p></span></pre>
<pre style="line-height:11.25pt;vertical-align:baseline"><span lang="EN-US" style="font-size:9.0pt;font-family:Consolas">Error: Unable to list kernel events: Kernel tracer not available<o:p></o:p></span></pre>
<pre style="line-height:11.25pt;vertical-align:baseline"><span lang="EN-US" style="font-size:9.0pt;font-family:Consolas">Error: Command error</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></pre>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">If I repeat the procedure on a machine without the real time kernel patch, it works as it should.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The real time kernel I’m using is the following<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">3.10.0-1160.62.1.rt56.1203.el7.x86_64<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Do you think the error is due to the real time patch? Can LTTng work with a real time kernel?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Do I need to follow a different procedure for installing LTTng on a RHEL 7.9 real time machine?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thank you,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Marco<o:p></o:p></span></p>
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