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Tracing the Linux kernel with ftrace - #embeddedbits
https://embeddedbits.org/tracing-the-linux-kernel-with-ftrace/
Ftrace stands for function tracer and basically lets you watch and record the execution flow of kernel functions. It was created by Steven Rostedt, derived from two other tools called latency tracer from Ingo Molnar and Steven’s logdev utility. With ftrace you can really see what the …
Linux Tracing Technologies — The Linux Kernel …
https://www.kernel.org/doc/html/latest/trace/index.html
Using the Linux Kernel Tracepoints Purpose of tracepoints Usage Event Tracing 1. Introduction 2. Using Event Tracing 3. Defining an event-enabled tracepoint 4. Event formats 5. Event filtering 6. Event triggers 7. In-kernel trace event API Subsystem Trace Points: kmem 1. Slab allocation of small objects of unknown type 2.
Event Tracing — The Linux Kernel documentation
https://www.kernel.org/doc/html/v4.19/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 …
Linux Tracing Technologies — The Linux Kernel …
https://www.kernel.org/doc/html/v4.18/trace/index.html
Using the Linux Kernel Tracepoints Purpose of tracepoints Usage Event Tracing 1. Introduction 2. Using Event Tracing 3. Defining an event-enabled tracepoint 4. Event formats 5. Event filtering 6. Event triggers Subsystem Trace Points: kmem 1. Slab allocation of small objects of unknown type 2. Slab allocation of small objects of known type 3.
Event Tracing — The Linux Kernel documentation
https://www.kernel.org/doc/html/latest/trace/events.html
1. Introduction¶. Tracepoints (see Using the Linux Kernel Tracepoints) can be used without creating custom kernel modules to register probe functions using the event tracing infrastructure.. Not all tracepoints can be traced using the event tracing system; the kernel developer must provide code snippets which define how the tracing information is saved into …
Dynamic tracing in Linux user and kernel space ...
https://opensource.com/article/17/7/dynamic-tracing-linux-user-and-kernel-space
Besides perf, there are a few other tools, such as SystemTap, DTrace, and LTTng, that can be used for kernel and user space tracing; however, perf is fully coupled with the kernel, so it's favored by kernel developers. # gcc -g -o test test.c # perf probe -x ./test func_2_entry=func_2 # perf probe -x ./test func_2_exit=func_2%return
A Linux Kernel Tracing Tutorial – BEC Systems
http://bec-systems.com/site/865/linux-tracing-tutorial
To observe the kernel activity around the kernel platform code, I can do the following: cd /sys/kernel/debug/tracing/ echo 0 > tracing_on (keep trace from filling up until we set filter) echo function_graph > current_tracer echo platform* > set_ftrace_filter echo 1 > tracing_on cat trace_pipe (leave running in a different shell) <insmod my driver>
Linux tracing, monitoring and debugging - stm32mpu
https://wiki.st.com/stm32mpu/wiki/Linux_tracing,_monitoring_and_debugging
2.2 Tracing framework Also named tracers, they use tracing sources. Tracing frameworks include kernel in-tree tracers such as ftrace and perf_events, and out-of-tree tracers such as SystemTap and sysdig. 2.3 Front-end tools Front-end tools come on top of tracers and help to configure them. For example: trace-cmd or LTTng for ftrace
How to Use BCC Kernel Tracing Tools for Linux …
https://linoxide.com/bcc-kernel-tracing-tools-linux-performance/
Next we will be showing you the usage of most important tools to and tracings. 1) ardist Display function parameter values as a histogram or frequency count. To get the detailed help about using this tool you use below command. # argdist -h For example you wanted a histogram of buffer sizes passed to the write ()
Linux tracing and debugging - OSADL
https://www.osadl.org/fileadmin/dam/presentations/HOT-04-2020/HOT-2020-04-Technical-Session-2a-Linux-kernel-debug-and-trace-interface.pdf
Main functionality of kernel tracing 1. “Classical” function tracer with dynamic function selection 2. Event tracer 3. Tracer of certain critical sections 4. Printk tracer 5. Hardware latency tracer Advantage over Syslog: Much faster and independent from user-space program
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