cachebust.diff

diff --git a/probes.d b/probes.d
index dd7a7bf..e077bd8 100644
--- a/probes.d
+++ b/probes.d
@@ -214,6 +214,16 @@ provider ruby {
      Fired at the end of a sweep phase.
   */
   probe gc__sweep__end();
+
+  /*
+     ruby:::method-cache-clear(filename, lineno);
+
+     This probe is fired when the method cache is cleared.
+
+     * `filename` the file name where the cache is _being cleared_ (a string)
+     * `lineno` the line number where the cache is _being cleared_ (an int)
+  */
+  probe method__cache__clear(const char *filename, int lineno);
 };
 
 #pragma D attributes Stable/Evolving/Common provider ruby provider
diff --git a/vm_method.c b/vm_method.c
index 0066c17..0be118f 100644
--- a/vm_method.c
+++ b/vm_method.c
@@ -47,6 +47,9 @@ void
 rb_clear_cache(void)
 {
     INC_VM_STATE_VERSION();
+    if (RUBY_DTRACE_METHOD_CACHE_CLEAR_ENABLED()) {
+  RUBY_DTRACE_METHOD_CACHE_CLEAR(rb_sourcefile(), rb_sourceline());
+    }
 }
 
 void
@@ -54,10 +57,13 @@ rb_clear_cache_by_class(VALUE klass)
 {
     if (klass && klass != Qundef) {
 	if (klass == rb_cBasicObject || klass == rb_cObject || klass == rb_mKernel) {
-	    INC_VM_STATE_VERSION();
+	    rb_clear_cache();
 	}
 	else {
 	    rb_class_clear_method_cache(klass);
+	    if (RUBY_DTRACE_METHOD_CACHE_CLEAR_ENABLED()) {
+		RUBY_DTRACE_METHOD_CACHE_CLEAR(rb_sourcefile(), rb_sourceline());
+	    }
 	}
     }
 }