AcoSail/kernel_optimize_test
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tracing: Enable adding dynamic events early stage

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Split the event fields initialization from creating new event directory.
This allows the boot-time tracing to define dynamic events before
initializing events directory on tracefs.

Link: https://lkml.kernel.org/r/159974153790.478751.3475515065034825374.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu 2020-09-10 21:38:58 +09:00 committed by Steven Rostedt (VMware)
parent ac343da7bc
commit a838deab4e
1 changed files with 8 additions and 1 deletions
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9
kernel/trace/trace_events.c
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@ -38,6 +38,7 @@ DEFINE_MUTEX(event_mutex);
LIST_HEAD(ftrace_events);
static LIST_HEAD(ftrace_generic_fields);
static LIST_HEAD(ftrace_common_fields);
static bool eventdir_initialized;
#define GFP_TRACE (GFP_KERNEL | __GFP_ZERO)
@ -2486,7 +2487,10 @@ __trace_add_new_event(struct trace_event_call *call, struct trace_array *tr)
if (!file)
return -ENOMEM;
return event_create_dir(tr->event_dir, file);
if (eventdir_initialized)
return event_create_dir(tr->event_dir, file);
else
return event_define_fields(call);
}
/*
@ -3478,6 +3482,9 @@ __init int event_trace_init(void)
if (ret)
pr_warn("Failed to register trace events module notifier\n");
#endif
eventdir_initialized = true;
return 0;
}