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Linux Kernel events tracing - Silicon Labs
https://community.silabs.com/s/article/linux-kernel-events-tracing?language=en_US
/sys/kernel/debug/tracing/trace overwrites itself after a …
https://unix.stackexchange.com/questions/684120/sys-kernel-debug-tracing-trace-overwrites-itself-after-a-few-seconds-how-can-i
When setting up the function_graph tracer in Linux (Ubuntu 18), the trace that is stored at /sys/kernel/debug/tracing/trace only stores a couple of seconds before overwriting itself. As the period might be variable, I cannot be saving it with for example cat /sys/kernel/debug/tracing/trace >> total_trace
Kernel Tracing with Ftrace - Andreas Ch
https://andreasch.com/2017/12/06/ftrace/
cat /sys/kernel/debug/tracing/available_tracers function - Function call tracer to trace all kernel functions. function_graph - Similar to the function tracer except that the function tracer probes the functions on their entry whereas the function graph tracer traces on both entry and exit of the functions.
Event Tracing — The Linux Kernel documentation
https://www.kernel.org/doc/html/latest/trace/events.html
The synth_event_trace() function is passed the trace_event_file representing the synthetic event (which can be retrieved using trace_get_event_file() using the synthetic event name, “synthetic” as the system name, and the trace instance name (NULL if using the global trace array)), along with an variable number of u64 args, one for each synthetic event field, and the number of …
In-kernel memory-mapped I/O tracing — The Linux Kernel …
https://docs.kernel.org/trace/mmiotrace.html
Start storing the trace: $ cat /sys/kernel/debug/tracing/trace_pipe > mydump.txt & The ‘cat’ process should stay running (sleeping) in the background. Load the driver you want to trace and use it. Mmiotrace will only catch MMIO accesses to areas that are ioremapped while mmiotrace is …
Tracing the Linux kernel with ftrace - #embeddedbits
https://embeddedbits.org/tracing-the-linux-kernel-with-ftrace/
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 restart - restart the kernel trace data recording show - show the contents of the kernel tracing buffer reset - disable all kernel tracing and clear the trace buffers report - read out the trace stored in …
Event Tracing — The Linux Kernel documentation
https://www.kernel.org/doc/html/v4.18/trace/events.html
The set_event_pid file in the same directory as the top events directory exists, will filter all events from tracing any task that does not have the PID listed in the set_event_pid file. # cd /sys/kernel/debug/tracing # echo $$ > set_event_pid # echo 1 > events/enable. Will only trace events for the current task.
3.9. Using the ftrace Utility for Tracing Latencies - Red Hat
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux_for_real_time/7/html/tuning_guide/using_the_ftrace_utility_for_tracing_latencies
In the /sys/kernel/debug/tracing/ directory, there is a file named available_tracers. This file contains all the available tracers for ftrace. To see the list of available tracers, use the cat command to view the contents of the file:
Linux SDIO detection - Silicon Labs
https://community.silabs.com/s/article/linux-sdio-detection?language=en_US
Tracing the kernel events on mmc1 (adapt the mmc to your own use case): # cat /sys/kernel/debug/tracing/trace_pipe | grep mmc1 & Unbinding/Binding the mmc bus to trigger a reset and reload the driver: echo 3f300000.mmc > /sys/bus/platform/drivers/mmc-bcm2835/unbind 2>/dev/null sleep 2 echo 3f300000.mmc > /sys/bus/platform/drivers/mmc …
gobpf 使用示例：使用 perf event 保存数据 - Huang Huang 的博客
https://mozillazg.com/2021/04/ebpf-gobpf-store-and-read-data-use-perf-event.html
前言¶. 前面 hello 示例中我们是通过 sudo cat /sys/kernel/debug/tracing/trace_pipe 的方式来查看数据的， 本文简单讲述如何通过 perf event ...
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