// SPDX-License-Identifier: GPL-2.0 /* * event tracer * * Copyright (C) 2022 Google Inc, Steven Rostedt <rostedt@goodmis.org> */ #define pr_fmt(fmt) fmt #include <linux/trace_events.h> #include <linux/module.h> #include <linux/sched.h> /* * Must include the event header that the custom event will attach to, * from the C file, and not in the custom header file. */ #include <trace/events/sched.h> /* Declare CREATE_CUSTOM_TRACE_EVENTS before including custom header */ #define CREATE_CUSTOM_TRACE_EVENTS #include "trace_custom_sched.h" /* * As the trace events are not exported to modules, the use of * for_each_kernel_tracepoint() is needed to find the trace event * to attach to. The fct() function below, is a callback that * will be called for every event. * * Helper functions are created by the TRACE_CUSTOM_EVENT() macro * update the event. Those are of the form: * * trace_custom_event_<event>_update() * * Where <event> is the event to attach. */ static void fct(struct tracepoint *tp, void *priv) { trace_custom_event_sched_switch_update(tp); trace_custom_event_sched_waking_update(tp); } static int __init trace_sched_init(void) { for_each_kernel_tracepoint(fct, NULL); return 0; } static void __exit trace_sched_exit(void) { } module_init(trace_sched_init); module_exit(trace_sched_exit); MODULE_AUTHOR("Steven Rostedt"); MODULE_DESCRIPTION("Custom scheduling events"); MODULE_LICENSE("GPL");