From a4c6b9ae011628d012dd8eaab39fb60aa595b922 Mon Sep 17 00:00:00 2001
From: Edward Tomasz Napierala <trasz@FreeBSD.org>
Date: Thu, 25 Oct 2018 16:06:42 +0100
Subject: [PATCH] Restore a FreeBSD-specific getpagesize(3) optimization.

It was removed in 0771ff2cea6dc18fcd3f6bf452b4224a4e17ae38.
Add a comment explaining its purpose.
---
 src/pages.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/pages.c b/src/pages.c
index 9f3085cb..13de27a0 100644
--- a/src/pages.c
+++ b/src/pages.c
@@ -419,6 +419,12 @@ os_page_detect(void) {
 	SYSTEM_INFO si;
 	GetSystemInfo(&si);
 	return si.dwPageSize;
+#elif defined(__FreeBSD__)
+	/*
+	 * This returns the value obtained from
+	 * the auxv vector, avoiding a syscall.
+	 */
+	return getpagesize();
 #else
 	long result = sysconf(_SC_PAGESIZE);
 	if (result == -1) {