https://git.ruby-lang.org/ruby.git/commit/?id=dddf5afb79

From dddf5afb7947f5aba1ff875e9f5eb163f8c3d6c7 Mon Sep 17 00:00:00 2001
From: Aaron Patterson <tenderlove@r...>
Date: Thu, 7 Nov 2019 12:46:14 -0800
Subject: Add a counter for compaction

Keep track of the number of times the compactor ran.  I would like to
use this as a way to keep track of inline cache reference updates.

diff --git a/gc.c b/gc.c
index e1bc984..ee8f62e 100644
--- a/gc.c
+++ b/gc.c
@@ -748,6 +748,7 @@ typedef struct rb_objspace { https://github.com/ruby/ruby/blob/trunk/gc.c#L748
 #if USE_RGENGC
 	size_t minor_gc_count;
 	size_t major_gc_count;
+	size_t compact_count;
 #if RGENGC_PROFILE > 0
 	size_t total_generated_normal_object_count;
 	size_t total_generated_shady_object_count;
@@ -8549,6 +8550,8 @@ gc_compact_after_gc(rb_objspace_t *objspace, int use_toward_empty, int use_doubl https://github.com/ruby/ruby/blob/trunk/gc.c#L8550
 
     mjit_gc_start_hook(); // prevent MJIT from running while moving pointers related to ISeq
 
+    objspace->profile.compact_count++;
+
     if (use_verifier) {
         gc_verify_internal_consistency(objspace);
     }
@@ -8890,6 +8893,7 @@ enum gc_stat_sym { https://github.com/ruby/ruby/blob/trunk/gc.c#L8893
 #if USE_RGENGC
     gc_stat_sym_minor_gc_count,
     gc_stat_sym_major_gc_count,
+    gc_stat_sym_compact_count,
     gc_stat_sym_remembered_wb_unprotected_objects,
     gc_stat_sym_remembered_wb_unprotected_objects_limit,
     gc_stat_sym_old_objects,
@@ -8966,6 +8970,7 @@ setup_gc_stat_symbols(void) https://github.com/ruby/ruby/blob/trunk/gc.c#L8970
 #if USE_RGENGC
 	S(minor_gc_count);
 	S(major_gc_count);
+	S(compact_count);
 	S(remembered_wb_unprotected_objects);
 	S(remembered_wb_unprotected_objects_limit);
 	S(old_objects);
@@ -9138,6 +9143,7 @@ gc_stat_internal(VALUE hash_or_sym) https://github.com/ruby/ruby/blob/trunk/gc.c#L9143
 #if USE_RGENGC
     SET(minor_gc_count, objspace->profile.minor_gc_count);
     SET(major_gc_count, objspace->profile.major_gc_count);
+    SET(compact_count, objspace->profile.compact_count);
     SET(remembered_wb_unprotected_objects, objspace->rgengc.uncollectible_wb_unprotected_objects);
     SET(remembered_wb_unprotected_objects_limit, objspace->rgengc.uncollectible_wb_unprotected_objects_limit);
     SET(old_objects, objspace->rgengc.old_objects);
diff --git a/test/ruby/test_gc_compact.rb b/test/ruby/test_gc_compact.rb
index bc26897..e93e775 100644
--- a/test/ruby/test_gc_compact.rb
+++ b/test/ruby/test_gc_compact.rb
@@ -54,4 +54,10 @@ class TestGCCompact < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_gc_compact.rb#L54
     assert GC.compact
     walk_ast ast
   end
+
+  def test_compact_count
+    count = GC.stat(:compact_count)
+    GC.compact
+    assert_equal count + 1, GC.stat(:compact_count)
+  end
 end
-- 
cgit v0.10.2


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