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Also within that same repository is KernelShark, which is a graphical user interface to trace-cmd.
Adapted from email by Steven Rostedt To trace just the kernel functions executed in the context of a particular function, set the pseudo-variable ‘set-ftrace-pid’, to the process id pid of the process.
These command should be probably be done programatically as part pytimecchart an init scriptto avoid data loss.
You can find these tracepoints by looking at the debugfs system:. You can use the following kernel command line parameters to generate a trace at boot, which can then be open with pytimechart to have a browsable bootchart.
python – How to install Pytimechart on Windows? – Stack Overflow
The interface for Ftrace resides in the debugfs file system in the tracing directory. You can find trace-cmd in its git winfows. Using the Ftrace debugfs interface can be awkward and time consuming.
You can capture the function calls leading up to a panic by pytimecchart the following on the kernel command line:. Then this script exec’s the command specified by the first argument to the script.
The above will enable all the Ftrace tracepoints that are grouped under the sched system. Retrieved from ” https: This is useful to find the routine with the deepest kernel stack The system continually monitors the stack depth of all processes, and whenever a low-water mark is pytiemchart deepest stackit records the list of functions.
This page was last edited on 27 Januaryat Ftrace is the Linux kernel internal tracer that was included in the Linux pytimechaart in 2. If the process is not already running, you can use a wrapper shell script and the ‘exec’ command, to execute a command as a known pid.
But the function tracer is the part of Ftrace that makes it unique as you can trace almost any function in the kernel and with dynamic Ftrace, it has no overhead when not enabled.