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Event Tracing — The Linux Kernel documentation
https://www.kernel.org/doc/html/latest/trace/events.html
The events which are available for tracing can be found in the file /sys/kernel/debug/tracing/available_events. To enable a particular event, such as ‘sched_wakeup’, simply echo it to /sys/kernel/debug/tracing/set_event. For example: # echo sched_wakeup >> /sys/kernel/debug/tracing/set_event Note
Linux Kernel events tracing - Silicon Labs
https://community.silabs.com/s/article/linux-kernel-events-tracing?language=en_US
Linux Kernel events tracing. When working on a Linux system, it can be convenient to use the kernel events tracing mechanism, (described in details in Documentation/trace/events.txt in the Linux kernel sources). We will only focus on a very simple use case here. Listing possible event traces
Event Tracing — The Linux Kernel documentation
https://www.kernel.org/doc/html/v4.18/trace/events.html
4. Event formats¶. Each trace event has a ‘format’ file associated with it that contains a description of each field in a logged event. This information can be used to parse the binary trace stream, and is also the place to find the field names that …
Tracing on Linux Updates - events.static.linuxfound.org
https://events.static.linuxfound.org/sites/events/files/slides/tracing-linux-ezannoni-linuxcon-eu-2013.pdf
echo 'r:myretprobe do_sys_open $retval' > /sys/kernel/debug/tracing/kprobe_events Set uprobe: echo 'p: /bin/bash:0x4245c0' > /sys/kernel/debug/tracing/uprobe_events Clear them: echo > /sys/kernel/debug/tracing/kprobe_events echo > /sys/kernel/debug/tracing/uprobe_events
linux-kernel Tutorial => Tracing I2C Events
https://riptutorial.com/linux-kernel/example/11983/tracing-i2c-events
Change into the tracing directory: cd /sys/kernel/debug/tracing/. Make sure the function tracer is disabled: echo nop > current_tracer. Enable all I2C events: echo 1 > events/i2c/enable. Make sure tracing is enabled: echo 1 > tracing_on. The trace messages can be viewed in /sys/kernel/debug/tracing/trace, example:
Tracing the Linux kernel with ftrace - #embeddedbits
https://embeddedbits.org/tracing-the-linux-kernel-with-ftrace/
Events are static tracepoints added by developers to monitor kernel subsystems like the scheduler, power management, interrupts, networking, gpio, etc. Just search for functions starting with trace_ in the Linux kernel source code and you …
Introduction to Linux Tracing and its Concepts
https://linuxfoundation.org/wp-content/uploads/ezannoni-tracing-tutorial-LF-2021.pdf
trace_pipe: output from live tracing available_events: which events (static points in kernel) are available available_tracers: which tracers are available (relates to kconfig options, for instance function_graph, function, nop...) kprobe_events, uprobe_events: written to when a kprobe (uprobe) is placed, empty if none
Linux tracing - trace event framework
https://terenceli.github.io/%E6%8A%80%E6%9C%AF/2020/08/08/trace-event-framework
Linux tracing - trace event framework 2020-08-08 Sample This post will show the trace event framework. The most important is the ‘TRACE_EVENT” expand and the connection between tracepoint with ftrace tracer. As usual we will start our discuss with an example. There are there files, sillymod.c,silly-trace.h,Makefile.
LTTng: an open source tracing framework for Linux
LTTng is an open source tracing framework for Linux. Instrument Identify appropriate events exposing your system 's behavior. Trace Extract the identified events with low overhead using LTTng . Investigate Use a GUI, CLI tools, and custom …
[PATCH v2 6/7] tracing/user_events: Use bits vs bytes for enabled ...
https://www.spinics.net/lists/linux-trace-devel/msg10118.html
User processes may require many events and when they do the cache performance of a byte index status check is less ideal than a bit index. The previous event limit per-page was 4096, the new limit is 32,768. This change adds a bitwise index to the user_reg struct. Programs check that the bit at status_bit has a bit set within the status page(s).
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