From 12866b0d31755dc045d7c5fce0a61572a41891c7 Mon Sep 17 00:00:00 2001
From: Takashi Kokubun <takashikkbn@gmail.com>
Date: Fri, 27 Nov 2020 21:52:22 -0800
Subject: [PATCH] Log when JIT compaction is skipped due to ISeq GC

---
 mjit_worker.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/mjit_worker.c b/mjit_worker.c
index ff03a1a0fe..c708f01b63 100644
--- a/mjit_worker.c
+++ b/mjit_worker.c
@@ -910,7 +910,10 @@ compile_compact_jit_code(char* c_file)
     bool iseq_gced = false;
     struct rb_mjit_unit *child_unit = 0;
     list_for_each(&active_units.head, child_unit, unode) {
-        if (child_unit->iseq == NULL) iseq_gced = true;
+        if (child_unit->iseq == NULL) {
+            iseq_gced = true;
+            verbose(1, "JIT compaction: A method for JIT code u%d is obsoleted. Compaction will be skipped.", child_unit->id);
+        }
     }
     in_jit = !iseq_gced;
     CRITICAL_SECTION_FINISH(3, "before mjit_compile to wait GC finish");