From dd13b6f3f5eb44e8f21c2996ab721cb435b7bb81 Mon Sep 17 00:00:00 2001
From: Frederic Lecaille <flecaille@haproxy.com>
Date: Thu, 27 Aug 2026 14:59:48 +0200
Subject: [PATCH] MINOR: haload: enable per-thread-group FD tables when
 available

Add <_GNU_SOURCE> so <CLONE_FILES> is visible from <sched.h>. When it
is, generate "expose-experimental-directives" and "tune.fd.tables
per-thread-group" in the global section.
---
 src/haload_init.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/haload_init.c b/src/haload_init.c
index b5f15e218..5e86e3fac 100644
--- a/src/haload_init.c
+++ b/src/haload_init.c
@@ -1,3 +1,4 @@
+#define _GNU_SOURCE
 #include <errno.h>
 
 #include <haproxy/connection.h>
@@ -431,6 +432,11 @@ void haproxy_init_args(int argc, char **argv)
 	hbuf_appendf(&gbuf, "global\n");
 	hbuf_appendf(&gbuf, "\ttune.memory.hot-size 3145728\n");
 	hbuf_appendf(&gbuf, "\tssl-server-verify none\n");
+#ifdef CLONE_FILES
+	/* required for "tune.fd.tables" below */
+	hbuf_appendf(&gbuf, "\texpose-experimental-directives\n");
+	hbuf_appendf(&gbuf, "\ttune.fd.tables per-thread-group\n");
+#endif
 
 	if (hbuf_alloc(&buf) == NULL) {
 		ha_alert("failed to allocate a buffer\n");
-- 
2.47.3