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SubjectRe: [PATCH V8 00/14] RTLA: An interface for osnoise/timerlat tracers
On Mon, Nov 29, 2021 at 12:07:38PM +0100, 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-0.4.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

Set osnoise/x to DEADLINE, the return is not success. see:

tao@geo ~/opensource/rtla-0.4 $ sudo rtla osnoise top -P d:100us:1ms -c 0-3 -r 900000 -d 1M -q
boost_with_deadline failed to boost pid 4766: Operation not permitted
Failed to set sched parameters

top shows:

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
4773 root 20 0 0 0 0 R 89.4 0.0 2:06.88 osnoise/0
4776 root 20 0 0 0 0 R 89.4 0.0 2:06.88 osnoise/3
4774 root 20 0 0 0 0 R 89.0 0.0 2:06.88 osnoise/1
4775 root 20 0 0 0 0 R 88.7 0.0 2:06.69 osnoise/2

t

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