From 3a73333fb370f7b65de9d94c53df503642bda789 Mon Sep 17 00:00:00 2001 From: "Steven Rostedt (Google)" Date: Thu, 3 Mar 2022 17:05:34 -0500 Subject: tracing: Add TRACE_CUSTOM_EVENT() macro 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 Cc: Andrew Morton Cc: Joel Fernandes Cc: Peter Zijlstra Cc: Masami Hiramatsu Cc: Tom Zanussi Signed-off-by: Steven Rostedt (Google) --- include/trace/define_custom_trace.h | 77 +++++++++++++++++++++++++++++++++++++ 1 file changed, 77 insertions(+) create mode 100644 include/trace/define_custom_trace.h (limited to 'include/trace/define_custom_trace.h') diff --git a/include/trace/define_custom_trace.h b/include/trace/define_custom_trace.h new file mode 100644 index 000000000000..5827a4c92c74 --- /dev/null +++ b/include/trace/define_custom_trace.h @@ -0,0 +1,77 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Trace files that want to automate creation of all tracepoints defined + * in their file should include this file. The following are macros that the + * trace file may define: + * + * TRACE_SYSTEM defines the system the tracepoint is for + * + * TRACE_INCLUDE_FILE if the file name is something other than TRACE_SYSTEM.h + * This macro may be defined to tell define_trace.h what file to include. + * Note, leave off the ".h". + * + * TRACE_INCLUDE_PATH if the path is something other than core kernel include/trace + * then this macro can define the path to use. Note, the path is relative to + * define_trace.h, not the file including it. Full path names for out of tree + * modules must be used. + */ + +#ifdef CREATE_CUSTOM_TRACE_EVENTS + +/* Prevent recursion */ +#undef CREATE_CUSTOM_TRACE_EVENTS + +#include + +#undef TRACE_CUSTOM_EVENT +#define TRACE_CUSTOM_EVENT(name, proto, args, tstruct, assign, print) + +#undef DEFINE_CUSTOM_EVENT +#define DEFINE_CUSTOM_EVENT(template, name, proto, args) + +#undef TRACE_INCLUDE +#undef __TRACE_INCLUDE + +#ifndef TRACE_INCLUDE_FILE +# define TRACE_INCLUDE_FILE TRACE_SYSTEM +# define UNDEF_TRACE_INCLUDE_FILE +#endif + +#ifndef TRACE_INCLUDE_PATH +# define __TRACE_INCLUDE(system) +# define UNDEF_TRACE_INCLUDE_PATH +#else +# define __TRACE_INCLUDE(system) __stringify(TRACE_INCLUDE_PATH/system.h) +#endif + +# define TRACE_INCLUDE(system) __TRACE_INCLUDE(system) + +/* Let the trace headers be reread */ +#define TRACE_CUSTOM_MULTI_READ + +#include TRACE_INCLUDE(TRACE_INCLUDE_FILE) + +#ifdef TRACEPOINTS_ENABLED +#include +#endif + +#undef TRACE_CUSTOM_EVENT +#undef DECLARE_CUSTOM_EVENT_CLASS +#undef DEFINE_CUSTOM_EVENT +#undef TRACE_CUSTOM_MULTI_READ + +/* Only undef what we defined in this file */ +#ifdef UNDEF_TRACE_INCLUDE_FILE +# undef TRACE_INCLUDE_FILE +# undef UNDEF_TRACE_INCLUDE_FILE +#endif + +#ifdef UNDEF_TRACE_INCLUDE_PATH +# undef TRACE_INCLUDE_PATH +# undef UNDEF_TRACE_INCLUDE_PATH +#endif + +/* We may be processing more files */ +#define CREATE_CUSTOM_TRACE_POINTS + +#endif /* CREATE_CUSTOM_TRACE_POINTS */ -- cgit v1.2.3