From b387b26cb3e2c8aaab81307292544a0376992e50 Mon Sep 17 00:00:00 2001
From: Rusty Russell <rusty@rustcorp.com.au>
Date: Thu, 8 May 2025 12:20:47 +0930
Subject: [PATCH] common: don't enable steal loop checking unless we're doing
 memleak checking.

Before:
92.26076173782349
91.9576666355133
90.92732524871826

After:
90.5989830493927
88.10309219360352
90.07689118385315
---
 common/daemon.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/common/daemon.c b/common/daemon.c
index c14de8b07..c3adac2a0 100644
--- a/common/daemon.c
+++ b/common/daemon.c
@@ -222,8 +222,11 @@ bool daemon_developer_mode(char *argv[])
 		kill(getpid(), SIGSTOP);
 	}
 
-	/* This checks for any tal_steal loops! */
-	add_steal_notifiers(NULL);
+	/* This checks for any tal_steal loops, but it's not free:
+	 * only use if we're already using the fairly heavy memleak
+	 * detection. */
+	if (getenv("LIGHTNINGD_DEV_MEMLEAK"))
+		add_steal_notifiers(NULL);
 
 	return true;
 }