linux-kernel - Re: [PATCH V9 00/14] RTLA: An interface for osnoise/timerlat tracers

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Message-ID: <YcLK3MXdFTwYYC7O@localhost.localdomain>
Date:   Wed, 22 Dec 2021 07:51:08 +0100
From:   Juri Lelli <juri.lelli@...hat.com>
To:     Daniel Bristot de Oliveira <bristot@...nel.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Tom Zanussi <zanussi@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Clark Williams <williams@...hat.com>,
        John Kacur <jkacur@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        linux-rt-users@...r.kernel.org, linux-trace-devel@...r.kernel.org,
        linux-kernel@...r.kernel.org, Tao Zhou <tao.zhou@...ux.dev>
Subject: Re: [PATCH V9 00/14] RTLA: An interface for osnoise/timerlat tracers

Hi!

On 10/12/21 19:11, Daniel Bristot de Oliveira wrote:
> The rtla(1) is a meta-tool that includes a set of commands that
> aims to analyze the real-time properties of Linux. But instead of
> testing Linux as a black box, rtla leverages kernel tracing
> capabilities to provide precise information about the properties
> and root causes of unexpected results.
> 
> To start, it presents an interface to the osnoise and timerlat tracers.
> In the future, it will also serve as home to the rtsl [1] and other
> latency/noise tracers.
> 
> If you just want to run it, you can download the tarball here:
>   - https://bristot.me/files/rtla/tarball/rtla-0.5.tar.bz2
> 
> To compile rtla on fedora you need:
>   $ git clone git://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git
>   $ cd libtraceevent/
>   $ make
>   $ sudo make install
>   $ cd ..
>   $ git clone git://git.kernel.org/pub/scm/libs/libtrace/libtracefs.git
>   $ cd libtracefs/
>   $ make
>   $ sudo make install
>   $ cd ..
>   $ sudo dnf install python3-docutils procps-devel
>   $ cd $rtla_src
>   $ make
>   $ sudo make install
> 
> The tracing option (-t) depends some kernel patches that are
> available at [2].

FWIW, I took this for a spin (on RT) and had a very positive experience
with it. Think is does what it says on the tin and makes using osnoise
and timerlat tracers easier.

Please feel free to add

Tested-by: Juri Lelli <juri.lelli@...hat.com>

Best,
Juri