From 7568c192767a1f34547e0d3ed2db5a9e0ab7f4d1 Mon Sep 17 00:00:00 2001
From: Nicholas Marriott <nicholas.marriott@gmail.com>
Date: Thu, 23 Jul 2026 09:12:16 +0100
Subject: [PATCH] Log jemalloc version if in use.

---
 proc.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/proc.c b/proc.c
index 7da1b430c..d3536b17e 100644
--- a/proc.c
+++ b/proc.c
@@ -31,6 +31,10 @@
 #include <ncurses.h>
 #endif
 
+#ifdef HAVE_JEMALLOC
+#include <jemalloc/jemalloc.h>
+#endif
+
 #include "tmux.h"
 
 struct tmuxproc {
@@ -181,6 +185,10 @@ proc_start(const char *name)
 {
 	struct tmuxproc	*tp;
 	struct utsname	 u;
+#ifdef HAVE_JEMALLOC
+	const char	*version;
+	size_t		 size = sizeof version;
+#endif
 
 	log_open(name);
 	setproctitle("%s (%s)", name, socket_path);
@@ -195,6 +203,11 @@ proc_start(const char *name)
 #ifdef HAVE_UTF8PROC
 	log_debug("using utf8proc %s", utf8proc_version());
 #endif
+#ifdef HAVE_JEMALLOC
+	if (mallctl("version", &version, &size, NULL, 0) != 0)
+		version = "(unknown version)";
+	log_debug("using jemalloc %s", version);
+#endif
 #ifdef NCURSES_VERSION
 	log_debug("using ncurses %s %06u", NCURSES_VERSION, NCURSES_VERSION_PATCH);
 #endif