add cc_invalidate_negative debug counter

counts for invalidating negative cache.

2 files changed, 3 insertions, 0 deletions

diff --git a/debug_counter.h b/debug_counter.h
index 752a3de02b..5153f73a6a 100644
--- a/debug_counter.h
+++ b/debug_counter.h
@@ -45,6 +45,7 @@ RB_DEBUG_COUNTER(cc_invalidate_leaf_callable) //                        complime
 RB_DEBUG_COUNTER(cc_invalidate_tree)          // count for invalidating klass if klass has sublcasses
 RB_DEBUG_COUNTER(cc_invalidate_tree_cme)      //                        cme if cme is found in this class or superclasses
 RB_DEBUG_COUNTER(cc_invalidate_tree_callable) //                        complimented cache (subclasses)
+RB_DEBUG_COUNTER(cc_invalidate_negative)      // count for invalidating negative cache
 
 RB_DEBUG_COUNTER(ccs_free)   // count for free'ing ccs
 RB_DEBUG_COUNTER(ccs_maxlen) // maximum length of ccs
diff --git a/vm_method.c b/vm_method.c
index f87c52fc54..122c43556f 100644
--- a/vm_method.c
+++ b/vm_method.c
@@ -198,6 +198,8 @@ clear_method_cache_by_id_in_class(VALUE klass, ID mid)
             if (rb_id_table_lookup(vm->negative_cme_table, mid, (VALUE *)&cme)) {
                 rb_id_table_delete(vm->negative_cme_table, mid);
                 vm_me_invalidate_cache((rb_callable_method_entry_t *)cme);
+
+                RB_DEBUG_COUNTER_INC(cc_invalidate_negative);
             }
         }
     }