Re: [lttng-dev] LTTng on RHEL 7.9 with real time kernel patch - Mathieu Desnoyers via lttng-dev

From: Mathieu Desnoyers via lttng-dev <lttng-dev@lists.lttng.org>
To: Pennese Marco <marco.pennese@leonardo.com>
Cc: lttng-dev <lttng-dev@lists.lttng.org>
Subject: Re: [lttng-dev] LTTng on RHEL 7.9 with real time kernel patch
Date: Mon, 18 Jul 2022 11:58:56 -0400 (EDT)	[thread overview]
Message-ID: <1511510448.72040.1658159936177.JavaMail.zimbra@efficios.com> (raw)
In-Reply-To: <e1e5a7797fa044e6a9010c494a451be7@leonardo.com>

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----- On Jul 15, 2022, at 9:19 AM, Pennese Marco via lttng-dev <lttng-dev@lists.lttng.org> wrote: 

> 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?

Hi Marco, 

Specific packaging needs around RHEL 7, including the real-time variant, are part of 
EfficiOS packaging, support and feature development services, which allow us to 
develop and maintain the entire LTTng open source ecosystem. Please contact us 
in private to discuss the available options. 

Thanks for reaching out! 

Mathieu 

> Thank you,

> Marco

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-- 
Mathieu Desnoyers 
EfficiOS Inc. 
http://www.efficios.com 

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