diff --git a/debug_counter.h b/debug_counter.h
index 3c5d693fe6..b29d5ef560 100644
--- a/debug_counter.h
+++ b/debug_counter.h
@@ -101,6 +101,25 @@ RB_DEBUG_COUNTER(lvar_set)
 RB_DEBUG_COUNTER(lvar_set_dynamic)
 RB_DEBUG_COUNTER(lvar_set_slowpath)
 
+/* GC counts:
+ *
+ * * count: simple count
+ * * _minor: minor gc
+ * * _major: major gc
+ * * other suffix is corresponding to last_gc_info or
+ *   gc_profile_record_flag in gc.c.
+ */
+RB_DEBUG_COUNTER(gc_count)
+RB_DEBUG_COUNTER(gc_minor_newobj)
+RB_DEBUG_COUNTER(gc_minor_malloc)
+RB_DEBUG_COUNTER(gc_minor_method)
+RB_DEBUG_COUNTER(gc_minor_capi)
+RB_DEBUG_COUNTER(gc_minor_stress)
+RB_DEBUG_COUNTER(gc_major_nofree)
+RB_DEBUG_COUNTER(gc_major_oldgen)
+RB_DEBUG_COUNTER(gc_major_shady)
+RB_DEBUG_COUNTER(gc_major_force)
+
 /* object allocation counts:
  *
  * * obj_newobj: newobj counts
diff --git a/gc.c b/gc.c
index f6f5617dd8..d5588bc19c 100644
--- a/gc.c
+++ b/gc.c
@@ -6536,6 +6536,23 @@ gc_start(rb_objspace_t *objspace, int reason)
 	      reason,
 	      do_full_mark, !is_incremental_marking(objspace), objspace->flags.immediate_sweep);
 
+#if USE_DEBUG_COUNTER
+    RB_DEBUG_COUNTER_INC(gc_count);
+    if (reason & GPR_FLAG_MAJOR_MASK) {
+        (void)RB_DEBUG_COUNTER_INC_IF(gc_major_nofree, reason & GPR_FLAG_MAJOR_BY_NOFREE);
+        (void)RB_DEBUG_COUNTER_INC_IF(gc_major_oldgen, reason & GPR_FLAG_MAJOR_BY_OLDGEN);
+        (void)RB_DEBUG_COUNTER_INC_IF(gc_major_shady,  reason & GPR_FLAG_MAJOR_BY_SHADY);
+        (void)RB_DEBUG_COUNTER_INC_IF(gc_major_force,  reason & GPR_FLAG_MAJOR_BY_FORCE);
+    }
+    else {
+        (void)RB_DEBUG_COUNTER_INC_IF(gc_minor_newobj, reason & GPR_FLAG_NEWOBJ);
+        (void)RB_DEBUG_COUNTER_INC_IF(gc_minor_malloc, reason & GPR_FLAG_MALLOC);
+        (void)RB_DEBUG_COUNTER_INC_IF(gc_minor_method, reason & GPR_FLAG_METHOD);
+        (void)RB_DEBUG_COUNTER_INC_IF(gc_minor_capi,   reason & GPR_FLAG_CAPI);
+        (void)RB_DEBUG_COUNTER_INC_IF(gc_minor_stress, reason & GPR_FLAG_NEWOBJ);
+    }
+#endif
+
     objspace->profile.count++;
     objspace->profile.latest_gc_info = reason;
     objspace->profile.total_allocated_objects_at_gc_start = objspace->total_allocated_objects;