From 676cdd66792ccb629a978837ea2a066d5db342cc Mon Sep 17 00:00:00 2001
From: Edward Tomasz Napierala <trasz@FreeBSD.org>
Date: Sat, 23 Jun 2018 05:44:23 +0100
Subject: [PATCH] Disable runtime detection of lazy purging support on FreeBSD.

The check doesn't seem to serve any purpose here, and this shaves
off three syscalls on binary startup.
---
 src/pages.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/pages.c b/src/pages.c
index 9561eb36..7ef3de75 100644
--- a/src/pages.c
+++ b/src/pages.c
@@ -586,6 +586,11 @@ pages_boot(void) {
 
 	init_thp_state();
 
+#ifdef __FreeBSD__
+	/*
+	 * FreeBSD doesn't need the check; madvise(2) is known to work.
+	 */
+#else
 	/* Detect lazy purge runtime support. */
 	if (pages_can_purge_lazy) {
 		bool committed = false;
@@ -599,6 +604,7 @@ pages_boot(void) {
 		}
 		os_pages_unmap(madv_free_page, PAGE);
 	}
+#endif
 
 	return false;
 }