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Tomas Glozar 1fdfafdeab rtla/timerlat_top: Stop timerlat tracer on signal 
commit a4dfce7559 upstream.

Currently, when either SIGINT from the user or SIGALRM from the duration
timer is caught by rtla-timerlat, stop_tracing is set to break out of
the main loop. This is not sufficient for cases where the timerlat
tracer is producing more data than rtla can consume, since in that case,
rtla is looping indefinitely inside tracefs_iterate_raw_events, never
reaches the check of stop_tracing and hangs.

In addition to setting stop_tracing, also stop the timerlat tracer on
received signal (SIGINT or SIGALRM). This will stop new samples so that
the existing samples may be processed and tracefs_iterate_raw_events
eventually exits.

Cc: stable@vger.kernel.org
Cc: John Kacur <jkacur@redhat.com>
Cc: Luis Goncalves <lgoncalv@redhat.com>
Cc: Gabriele Monaco <gmonaco@redhat.com>
Link: https://lore.kernel.org/20250116144931.649593-4-tglozar@redhat.com
Fixes: a828cd18bc ("rtla: Add timerlat tool and timelart top mode")
Signed-off-by: Tomas Glozar <tglozar@redhat.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-02-17 10:05:43 +01:00
..
sample tools/rtla: Enhance argument parsing in timerlat_load.py 2024-12-14 20:04:03 +01:00
src rtla/timerlat_top: Stop timerlat tracer on signal 2025-02-17 10:05:43 +01:00
.gitignore tools/rtla: Use tools/build makefiles to build rtla 2024-03-20 05:39:06 +01:00
Build tools/rtla: Use tools/build makefiles to build rtla 2024-03-20 05:39:06 +01:00
Makefile tools/rtla: Use tools/build makefiles to build rtla 2024-03-20 05:39:06 +01:00
Makefile.config tools/rtla: Use pkg-config in lib_setup of Makefile.config 2024-07-17 13:15:08 -07:00
Makefile.rtla tools/rtla: Fix installation from out-of-tree build 2024-10-03 16:43:22 -04:00
Makefile.standalone tools/rtla: Use tools/build makefiles to build rtla 2024-03-20 05:39:06 +01:00
README.txt rtla: Remove procps-ng dependency 2022-05-26 15:20:46 -04:00

README.txt 

RTLA: Real-Time Linux Analysis tools

The rtla meta-tool includes a set of commands that aims to analyze
the real-time properties of Linux. 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.

Installing RTLA

RTLA depends on the following libraries and tools:

 - libtracefs
 - libtraceevent

It also depends on python3-docutils to compile man pages.

For development, we suggest the following steps for compiling rtla:

  $ 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 ..
  $ cd $rtla_src
  $ make
  $ sudo make install

For further information, please refer to the rtla man page.