trace: profile all if conditionals

[safe/jmp/linux-2.6] / include / linux / compiler.h

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 0628a20..ea7c6be 100644 (file)
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -63,8 +63,16 @@ struct ftrace_branch_data {
        const char *func;
        const char *file;
        unsigned line;
-       unsigned long correct;
-       unsigned long incorrect;
+       union {
+               struct {
+                       unsigned long correct;
+                       unsigned long incorrect;
+               };
+               struct {
+                       unsigned long miss;
+                       unsigned long hit;
+               };
+       };
 };
 
 /*
@@ -103,6 +111,32 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
 # ifndef unlikely
 #  define unlikely(x)  (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0))
 # endif
+
+#ifdef CONFIG_PROFILE_ALL_BRANCHES
+/*
+ * "Define 'is'", Bill Clinton
+ * "Define 'if'", Steven Rostedt
+ */
+#define if(cond) if (__builtin_constant_p((cond)) ? !!(cond) :         \
+       ({                                                              \
+               int ______r;                                            \
+               static struct ftrace_branch_data                        \
+                       __attribute__((__aligned__(4)))                 \
+                       __attribute__((section("_ftrace_branch")))      \
+                       ______f = {                                     \
+                               .func = __func__,                       \
+                               .file = __FILE__,                       \
+                               .line = __LINE__,                       \
+                       };                                              \
+               ______r = !!(cond);                                     \
+               if (______r)                                            \
+                       ______f.hit++;                                  \
+               else                                                    \
+                       ______f.miss++;                                 \
+               ______r;                                                \
+       }))
+#endif /* CONFIG_PROFILE_ALL_BRANCHES */
+
 #else
 # define likely(x)     __builtin_expect(!!(x), 1)
 # define unlikely(x)   __builtin_expect(!!(x), 0)