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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2019-11-08 21:12:57 +0300
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2019-11-13 17:36:49 +0300
commita3ad1a7e39689005cb04a4f2adb82f9d55b4724f (patch)
tree64deafb73e244d233836735dd2fa6a3c41462cc6 /include/linux/ftrace.h
parent562955fe6a558b9ef98ad87c470314946338cb2f (diff)
downloadlinux-a3ad1a7e39689005cb04a4f2adb82f9d55b4724f.tar.xz
ftrace/x86: Add a counter to test function_graph with direct
As testing for direct calls from the function graph tracer adds a little overhead (which is a lot when tracing every function), add a counter that can be used to test if function_graph tracer needs to test for a direct caller or not. It would have been nicer if we could use a static branch, but the static branch logic fails when used within the function graph tracer trampoline. Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/ftrace.h')
-rw-r--r--include/linux/ftrace.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 2bc7bd6b8387..55647e185141 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -247,10 +247,12 @@ static inline void ftrace_free_mem(struct module *mod, void *start, void *end) {
#endif /* CONFIG_FUNCTION_TRACER */
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
+extern int ftrace_direct_func_count;
int register_ftrace_direct(unsigned long ip, unsigned long addr);
int unregister_ftrace_direct(unsigned long ip, unsigned long addr);
struct ftrace_direct_func *ftrace_find_direct_func(unsigned long addr);
#else
+# define ftrace_direct_func_count 0
static inline int register_ftrace_direct(unsigned long ip, unsigned long addr)
{
return -ENODEV;