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ftrace - Function Tracer — The Linux Kernel documentation
https://www.kernel.org/doc/html/latest/trace/ftrace.html
tracing_cpumask. When the test is started. A kernel thread is created that runs the test. This thread will alternate between CPUs listed in the tracing_cpumask between each period (one “window”). To limit the test to specific CPUs set the mask in …
Tracing the Linux kernel with ftrace - #embeddedbits
https://embeddedbits.org/tracing-the-linux-kernel-with-ftrace/
Ftrace is also able to trace events in the kernel. 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 will find several places where trace events are used:
Kernel Tracing with Ftrace - Selectel Blog
https://blog.selectel.com/kernel-tracing-ftrace/
Debugging the kernel using Ftrace - programmer.group
https://programmer.group/debugging-the-kernel-using-ftrace.html
[tracing]# echo 0 > tracing_on. This prevents Ftrace from flushing records into the ring buffer, but all other calls to the tracker still occur and still incur a lot of overhead. If you need to re enable the ring buffer, you only need to write "1" to the file. [tracing]# echo 1 > tracing_on
Tracing with ftrace Critical tooling for Linux …
https://linuxfoundation.org/wp-content/uploads/ftrace-mentorship-2021.pdf
What is ftrace? The official tracer for Linux (since 2008) Technically, “ftrace” is the way to attach callbacks to kernel functions. It is also known as the tracing system around /sys/kernel/tracing –(Formally in /sys/kernel/debug/tracing) ©2021 VMware, Inc. 5 How to interact with it?
Kernel Tracing with Ftrace - Andreas Ch
https://andreasch.com/2017/12/06/ftrace/
Ftrace was developed by Steven Rostedt and has been included in the kernel since version 2.6.27. It can be used for debugging or analyzing latencies and performance issues that take place outside of user-space. Ftrace uses the debugfs file system to hold the control files as well as the files to display output. To mount this directory, you can add to your /etc/fstab file:
Ftrace: Latency Tracing - OSADL
https://www.osadl.org/fileadmin/dam/presentations/RTLWS11/rostedt-ftrace.pdf
events set_ftrace_pid tracing_cpumask failures set_graph_function tracing_enabled function_profile_enabled stack_max_size tracing_max_latency options stack_trace tracing_on per_cpu sysprof_sample_period tracing_thresh. Tracer Plugins Found in …
kernel - perf ftrace falis to start - Stack Overflow
https://stackoverflow.com/questions/54200712/perf-ftrace-falis-to-start
write '' to tracing/tracing_cpumask failed: Invalid argument failed to reset ftrace However my kernel configured ftrace enabled and trace-cmd ftrace frontend also works as well. For some reason in the perf/builtin-ftrace.c file in the write_tracing_file function I get
Ftrace on android freeze when turn on function trace, …
https://stackoverflow.com/questions/13044214/ftrace-on-android-freeze-when-turn-on-function-trace-somebody-help-me
There's several reasons that the function tracer may freeze. It's a very invasive tracer (traces almost all functions of the kernel). One issue is if it traces an internal function like disabling interrupts. This would cause it to go into an infinite loop. Now I assume you have an ARM device if you are running Android.
Advanced Features of Ftrace - events.static.linuxfound.org
https://events.static.linuxfound.org/sites/events/files/slides/linuxconjapan-ftrace-2014.pdf
trace-cmd. command line interface to ftrace debugfs. man trace-cmd. git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/trace-cmd.git. commands: record - record a trace into a trace.dat file start - start tracing without recording into a file extract - extract a trace from the kernel stop - stop the kernel from recording trace data show - show the contents of …
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