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To make it really easy to add custom events from modules, add a TRACE_CUSTOM_EVENT() macro that acts just like the TRACE_EVENT() macro, but creates a custom event to an already existing tracepoint. The trace_custom_sched.[ch] has been updated to use this new macro to show how simple it is. Link: https://lkml.kernel.org/r/20220303220625.738622494@goodmis.org Cc: Ingo Molnar <mingo@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Joel Fernandes <joel@joelfernandes.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Tom Zanussi <zanussi@kernel.org> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
60 lines
1.4 KiB
C
60 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* event tracer
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*
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* Copyright (C) 2022 Google Inc, Steven Rostedt <rostedt@goodmis.org>
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*/
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#define pr_fmt(fmt) fmt
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#include <linux/trace_events.h>
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#include <linux/version.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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/*
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* Must include the event header that the custom event will attach to,
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* from the C file, and not in the custom header file.
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*/
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#include <trace/events/sched.h>
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/* Declare CREATE_CUSTOM_TRACE_EVENTS before including custom header */
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#define CREATE_CUSTOM_TRACE_EVENTS
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#include "trace_custom_sched.h"
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/*
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* As the trace events are not exported to modules, the use of
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* for_each_kernel_tracepoint() is needed to find the trace event
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* to attach to. The fct() function below, is a callback that
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* will be called for every event.
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*
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* Helper functions are created by the TRACE_CUSTOM_EVENT() macro
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* update the event. Those are of the form:
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*
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* trace_custom_event_<event>_update()
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*
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* Where <event> is the event to attach.
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*/
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static void fct(struct tracepoint *tp, void *priv)
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{
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trace_custom_event_sched_switch_update(tp);
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trace_custom_event_sched_waking_update(tp);
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}
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static int __init trace_sched_init(void)
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{
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for_each_kernel_tracepoint(fct, NULL);
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return 0;
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}
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static void __exit trace_sched_exit(void)
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{
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}
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module_init(trace_sched_init);
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module_exit(trace_sched_exit);
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MODULE_AUTHOR("Steven Rostedt");
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MODULE_DESCRIPTION("Custom scheduling events");
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MODULE_LICENSE("GPL");
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