register_ftrace_function(9)

🎀 NAME 🎀

okay so bestie, this is the Kernel API Manual page register_ftrace_function(9), and it’s about register_ftrace_function — registering a function for profiling. 💖

📜 SYNOPSIS 📜

int register_ftrace_function (struct ftrace_ops *ops );

🌸 ARGUMENTS 🌸

• ops — the ops structure that holds the function for profiling. Like, it’s the container carrying your profiling function, bestie. 🫶

✨ DESCRIPTION ✨

Register a function to be called by all functions in the kernel. Literally all of them. It’s giving “my function knows everybody” energy. 👑

🚨 NOTE 🚨

ops->func and all the functions it calls must be labeled with "notrace", otherwise it will go into a recursive loop. 💀 No cap, that recursive loop is not the vibe — label it "notrace". Periodt.

🦋 SEE ALSO 🦋

Kernel file ./kernel/trace/ftrace.c — here’s the whole reference squad, bestie:

• ftrace_lookup_ip(9)
• ftrace_free_filter(9)
• ftrace_hash_move(9)
• ftrace_location_range(9)
• ftrace_location(9)
• ftrace_text_reserved(9)
• ftrace_bug(9)
• ftrace_update_record(9)
• ftrace_test_record(9)
• ftrace_get_addr_new(9)
• ftrace_get_addr_curr(9)
• ftrace_rec_iter_start(9)
• ftrace_rec_iter_next(9)
• ftrace_rec_iter_record(9)
• ftrace_run_stop_machine(9)
• arch_ftrace_update_code(9)
• ftrace_startup_subops(9)
• ftrace_shutdown_subops(9)
• ftrace_regex_open(9)
• allocate_ftrace_func_mapper(9)
• ftrace_func_mapper_find_ip(9)
• ftrace_func_mapper_add_ip(9)
• ftrace_func_mapper_remove_ip(9)
• free_ftrace_func_mapper(9)
• register_ftrace_direct(9)
• unregister_ftrace_direct(9)
• modify_ftrace_direct_nolock(9)
• modify_ftrace_direct(9)
• hash_add(9)
• update_ftrace_direct_add(9)
• hash_sub(9)
• update_ftrace_direct_del(9)
• update_ftrace_direct_mod(9)
• ftrace_set_filter_ip(9)
• ftrace_set_filter_ips(9)
• ftrace_ops_set_global_filter(9)
• ftrace_set_filter(9)
• ftrace_set_notrace(9)
• ftrace_set_global_filter(9)
• ftrace_set_global_notrace(9)
• ftrace_ops_get_func(9)
• ftrace_kill(9)
• ftrace_is_dead(9)
• unregister_ftrace_function(9)
• ftrace_lookup_symbols(9)

Mwah 💖 this page comes from source/version ./kernel/trace, dated October 2026, and it’s the register_ftrace_function(9) page. Bye bestie, go label your functions! 🌈✨