You can find these tracepoints by looking at the debugfs system:. The above will enable all the Ftrace tracepoints that are grouped under the sched system. This page was last edited on 27 January , at Although Ftrace is named after the function tracer it also includes many more functionalities. The interface for Ftrace resides in the debugfs file system in the tracing directory. Ftrace is the Linux kernel internal tracer that was included in the Linux kernel in 2. Views Read View source View history.
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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 hit deepest stackit records the list of functions.
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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. Then this script exec’s the command specified by the first argument to the script. Also within that same repository is KernelShark, which is a graphical user interface to trace-cmd.
This page was last edited on 27 Januaryat 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.
Retrieved from ” https: This allows building trace-cmd on your embedded device and keeping the build from needing the GTK libraries required by KernelShark. Views Read View source View history. These command should be probably be done programatically as part of an init scriptto avoid data loss.
Although Ftrace is named after the function tracer it also includes many more functionalities. Ftrace is the Linux kernel internal tracer that was included pytimecchart the Linux kernel in 2. This can be used for finding routines that are taking a long time on kernel startup, to help optimize bootup time:. You can find trace-cmd in its git repository.
You can capture the function calls leading up to a panic by placing the following on the kernel command line:. The above will enable all the Ftrace tracepoints that are grouped under the sched system.
The interface for Ftrace resides in the debugfs file system in the tracing winrows.
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Using the Ftrace debugfs interface can be awkward and time consuming. You can find these tracepoints by looking at the debugfs system:. Navigation menu Personal tools Log in Request account. But the function tracer is the part of Ftrace that makes it unique pytmiechart you can trace almost any function in the kernel winfows with dynamic Ftrace, it has no overhead when not enabled.
You can use pytimechart to explore ftrace traces visually.