From 568f01f6c3e51ef4b24abe532237081a35e585f6 Mon Sep 17 00:00:00 2001
From: Edward Tomasz Napierala <trasz@FreeBSD.org>
Date: Tue, 31 Mar 2020 13:48:06 +0000
Subject: [PATCH] Make jemalloc(3) default to retain:true on 64-bit platforms,
 like it already does on Linux and OSX.  This results in significantly fewer
 calls to mmap(2).  This should result in a small reduction in system CPU time
 and improved superpage usage.

Reviewed by:	markj
Tested by:	markj
MFC after:	2 weeks
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D23874
---
 contrib/jemalloc/include/jemalloc/jemalloc_FreeBSD.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/contrib/jemalloc/include/jemalloc/jemalloc_FreeBSD.h b/contrib/jemalloc/include/jemalloc/jemalloc_FreeBSD.h
index b752b0e7856..c598d5e0731 100644
--- a/contrib/jemalloc/include/jemalloc/jemalloc_FreeBSD.h
+++ b/contrib/jemalloc/include/jemalloc/jemalloc_FreeBSD.h
@@ -72,6 +72,10 @@
 #  define LG_SIZEOF_PTR		3
 #endif
 
+#if LG_VADDR > 32
+#  define JEMALLOC_RETAIN
+#endif
+
 #ifndef JEMALLOC_TLS_MODEL
 #  define JEMALLOC_TLS_MODEL	/* Default. */
 #endif