linux-dev/Documentation/tools/rtla, branch linus/master

Merge tag 'trace-tools-v5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2022-05-29T17:48:58Z

Pull tracing tool updates from Steven Rostedt: - Various clean ups and fixes to rtla (Real Time Linux Analysis) * tag 'trace-tools-v5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: rtla: Remove procps-ng dependency rtla: Fix __set_sched_attr error message rtla: Minor grammar fix for rtla README rtla: Don't overwrite existing directory mode rtla: Avoid record NULL pointer dereference rtla/Makefile: Properly handle dependencies

rtla/Makefile: Properly handle dependencies

2022-05-26T19:17:48Z

Linus had a problem compiling RTLA, saying: "[...] I wish the tracing tools would do a bit more package checking and helpful error messages too, rather than just fail with: fatal error: tracefs.h: No such file or directory" Which is indeed not a helpful message. Update the Makefile, adding proper checks for the dependencies, with useful information about how to resolve possible problems. For example, the previous error is now reported as: $ make ******************************************** ** NOTICE: libtracefs version 1.3 or higher not found ** ** Consider installing the latest libtracefs from your ** distribution, e.g., 'dnf install libtracefs' on Fedora, ** or from source: ** ** https://git.kernel.org/pub/scm/libs/libtrace/libtracefs.git/ ** ******************************************** These messages are inspired by the ones used on trace-cmd, as suggested by Stevel Rostedt. Link: https://lore.kernel.org/r/CAHk-=whxmA86E=csNv76DuxX_wYsg8mW15oUs3XTabu2Yc80yw@mail.gmail.com/ Changes from V1: - Moved the rst2man check to the install phase (when it is used). - Removed the procps-ng lib check [1] as it is being removed. [1] a0f9f8c1030c66305c9b921057c3d483064d5529.1651220820.git.bristot@kernel.org Link: https://lkml.kernel.org/r/3f1fac776c37e4b67c876a94e5a0e45ed022ff3d.1651238057.git.bristot@kernel.org Cc: Ingo Molnar Cc: Andrew Morton Reported-by: Linus Torvalds Suggested-by: Steven Rostedt Signed-off-by: Daniel Bristot de Oliveira Signed-off-by: Steven Rostedt (Google)

rtla: Documentation: fix email addresses

2022-04-20T08:39:16Z

Correct lkml@vger to linux-kernel@vger. Add linux-trace-devel since that is what is in the MAINTAINERS file. Fixes: d40d48e1f1f2 ("rtla: Add Documentation") Signed-off-by: Randy Dunlap Acked-by: Daniel Bristot de Oliveira Cc: Steven Rostedt Signed-off-by: Jonathan Corbet

Merge tag 'trace-rtla-v5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2022-03-23T18:08:10Z

Pull RTLA tracing tool updates from Steven Rostedt: "Real Time Analysis Tool updatesfor 5.18: - Support for adjusting tracing_threashold - Add -a (auto) option to make it easier for users to debug in the field - Add -e option to add more events to the trace - Add --trigger option to add triggers to events - Add --filter option to filter events - Add support to save histograms to the file - Add --dma-latency to set /dev/cpu_dma_latency - Other fixes and cleanups" * tag 'trace-rtla-v5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: rtla: Tools main loop cleanup rtla/timerlat: Add --dma-latency option rtla/osnoise: Fix osnoise hist stop tracing message rtla: Check for trace off also in the trace instance rtla/trace: Save event histogram output to a file rtla: Add --filter support rtla/trace: Add trace event filter helpers rtla: Add --trigger support rtla/trace: Add trace event trigger helpers rtla: Add -e/--event support rtla/trace: Add trace events helpers rtla/timerlat: Add the automatic trace option rtla/osnoise: Add the automatic trace option rtla/osnoise: Add an option to set the threshold rtla/osnoise: Add support to adjust the tracing_thresh

rtla/timerlat: Add --dma-latency option

2022-03-15T18:36:50Z

Add the --dma-latency to set /dev/cpu_dma_latency to the specified value, this aims to avoid having exit from idle states latencies that could be influencing the analysis. Link: https://lkml.kernel.org/r/72ddb0d913459f13217086dadafad88a7c46dd28.1646247211.git.bristot@kernel.org Cc: Daniel Bristot de Oliveira Cc: Clark Williams Cc: Juri Lelli Cc: Jonathan Corbet Signed-off-by: Daniel Bristot de Oliveira Signed-off-by: Steven Rostedt (Google)

rtla/trace: Save event histogram output to a file

2022-03-15T18:36:50Z

The hist: trigger generates a histogram in the file sys/event/hist. If the hist: trigger is used, automatically save the histogram output of the event sys:event in the sys_event_hist.txt file. Link: https://lkml.kernel.org/r/b5c906af31d4e022ffe87fb0848fac5c089087c8.1646247211.git.bristot@kernel.org Cc: Daniel Bristot de Oliveira Cc: Clark Williams Cc: Juri Lelli Cc: Jonathan Corbet Signed-off-by: Daniel Bristot de Oliveira Signed-off-by: Steven Rostedt (Google)

rtla: Add --filter support

2022-03-15T18:36:50Z

Add --filter option. This option enables a trace event filtering of the previous -e sys:event argument. This option is available for all current tools. Link: https://lkml.kernel.org/r/509d70b6348d3e5bcbf1f07ab725ce08d063149a.1646247211.git.bristot@kernel.org Cc: Daniel Bristot de Oliveira Cc: Clark Williams Cc: Juri Lelli Cc: Jonathan Corbet Signed-off-by: Daniel Bristot de Oliveira Signed-off-by: Steven Rostedt (Google)

rtla: Add --trigger support

2022-03-15T18:36:49Z

Add --trigger option. This option enables a trace event trigger to the previous -e sys:event argument, allowing some advanced tracing options. For instance, in a system with CPUs 2:23 isolated, it is possible to get a stack trace of thread wakeup targeting those CPUs while running osnoise with the following command line: # osnoise top -c 2-23 -a 50 -e sched:sched_wakeup --trigger="stacktrace if target_cpu >= 2" This option is available for all current tools. Link: https://lkml.kernel.org/r/07d2983d5f71261d4da89dbaf02efcad100ab8ee.1646247211.git.bristot@kernel.org Cc: Daniel Bristot de Oliveira Cc: Clark Williams Cc: Juri Lelli Cc: Jonathan Corbet Signed-off-by: Daniel Bristot de Oliveira Signed-off-by: Steven Rostedt (Google)

rtla: Add -e/--event support

2022-03-15T18:36:49Z

Add -e/--event option. This option enables an event in the trace (-t) session. The argument can be a specific event, e.g., -e sched:sched_switch, or all events of a system group, e.g., -e sched. Multiple -e are allowed. It is only active when -t or -a are set. This option is available for all current tools. Link: https://lkml.kernel.org/r/6a3b753be9b1e811953995f7f21a86918ad13390.1646247211.git.bristot@kernel.org Cc: Daniel Bristot de Oliveira Cc: Clark Williams Cc: Juri Lelli Cc: Jonathan Corbet Signed-off-by: Daniel Bristot de Oliveira Signed-off-by: Steven Rostedt (Google)

rtla/timerlat: Add the automatic trace option

2022-03-15T18:36:49Z

Add the -a/--auto option. This option sets some commonly used options while debugging the system. It aims to help users produce reports in the field, reducing the number of arguments passed to the tool in the first approach to a problem. It is equivalent to setting osnoise/stop_tracing_total_us and print_stack with the argument, and saving the trace to timerlat_trace.txt file if the trace is stopped automatically. Link: https://lkml.kernel.org/r/92438f7ef132c731f538cebdf77850300afe04a5.1646247211.git.bristot@kernel.org Cc: Daniel Bristot de Oliveira Cc: Clark Williams Cc: Juri Lelli Cc: Jonathan Corbet Signed-off-by: Daniel Bristot de Oliveira Signed-off-by: Steven Rostedt (Google)