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uname -a: Linux server1.tuhinhossain.com 5.15.0-163-generic #173-Ubuntu SMP Tue Oct 14 17:51:00 UTC
2025 x86_64 

uid=1002(picotech) gid=1003(picotech) groups=1003(picotech),0(root)  

Safe-mode: OFF (not secure)

/usr/src/linux-headers-5.15.0-163/tools/testing/selftests/bpf/   drwxr-xr-x
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Viewing file:     test_ftrace.sh (701 B)      -rwxr-xr-x

#!/bin/bash

TR=/sys/kernel/debug/tracing/
clear_trace() { # reset trace output
    echo > $TR/trace
}

disable_tracing() { # stop trace recording
    echo 0 > $TR/tracing_on
}

enable_tracing() { # start trace recording
    echo 1 > $TR/tracing_on
}

reset_tracer() { # reset the current tracer
    echo nop > $TR/current_tracer
}

disable_tracing
clear_trace

echo "" > $TR/set_ftrace_filter
echo '*printk* *console* *wake* *serial* *lock*' > $TR/set_ftrace_notrace

echo "bpf_prog_test*" > $TR/set_graph_function
echo "" > $TR/set_graph_notrace

echo function_graph > $TR/current_tracer

enable_tracing
./test_progs -t fentry
./test_progs -t fexit
disable_tracing
clear_trace

reset_tracer

exit 0