linuxlinux-kernelftrace

How to get function name after ' } ' in ftrace/ trace-cmd

I have recently started working with ftrace. I able to get function graph trace using

trace-cmd record -p function_graph -F <bash command>
trace-cmd report

With the above commands I can see time taken by function to finish before ' } ' But I want to script for listing functions taking more time than 10ms.

Can anyone help me to achieve this?

Solution

  • TLDR it can be achieved by

    trace-cmd report -O fgraph:tailprint=yes

    explanation

    as per help

    -O plugin option -O [plugin:]var[=val]

    but when we try but plugin name function_graph what we use for record doesn't work as well if we dig in ftrace docs we have option funcgraph-tail but even this won't work

    finally when you dig in source code of trace-cmd

    trace-cmd/lib/trace-cmd/trace-ftrace.c

    has these options.