vm_method.c: add new ruby::method-cache-clear dtrace probe

* vm_method.c (rb_clear_method_cache_by_class): fire
  ruby::method-cache-clear probe on global or klass-level method cache
  clear [Bug #9190]
* probes.d (provider ruby): new dtrace probe
* doc/dtrace_probes.rdoc: docs for new probe
* test/dtrace/test_method_cache.rb: test for new probe

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44103 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 11 insertions, 0 deletions

diff --git a/probes.d b/probes.d
index dd7a7bfcd3..dc20d30172 100644
--- a/probes.d
+++ b/probes.d
@@ -214,6 +214,17 @@ provider ruby {
      Fired at the end of a sweep phase.
   */
   probe gc__sweep__end();
+
+  /*
+     ruby:::method-cache-clear(class, filename, lineno);
+
+     This probe is fired when the method cache is cleared.
+
+     * `class` the name of the class or "global" (a string)
+     * `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 *class, const char *filename, int lineno);
 };
 
 #pragma D attributes Stable/Evolving/Common provider ruby provider