[lttng-dev] LTTng on RHEL 7.9 with real time kernel patch - Pennese Marco via lttng-dev

From: Pennese Marco via lttng-dev <lttng-dev@lists.lttng.org>
To: "lttng-dev@lists.lttng.org" <lttng-dev@lists.lttng.org>
Subject: [lttng-dev] LTTng on RHEL 7.9 with real time kernel patch
Date: Fri, 15 Jul 2022 13:19:04 +0000	[thread overview]
Message-ID: <e1e5a7797fa044e6a9010c494a451be7@leonardo.com> (raw)

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Hi,

I’m trying to use LTTng on a Red Hat Enterprise Linux 7.9 (with the real time kernel patch).
I installed LTTng on the machine following the EfficiOS guide linked by lttng official website.

In my configuration, lttng manages to record user space events.
I’d like to record also kernel space events, so I’m following the quickstart guide on the website.

As soon as I run “lttng list –-kernel”, I obtain the error:

Error: Unable to list kernel events: Kernel tracer not available

Error: Command error

If I repeat the procedure on a machine without the real time kernel patch, it works as it should.
The real time kernel I’m using is the following
3.10.0-1160.62.1.rt56.1203.el7.x86_64

Do you think the error is due to the real time patch? Can LTTng work with a real time kernel?
Do I need to follow a different procedure for installing LTTng on a RHEL 7.9 real time machine?

Thank you,
Marco

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