D39743.diff
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D39743.diff
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	diff --git a/sys/vm/vm_map.c b/sys/vm/vm_map.c
	--- a/sys/vm/vm_map.c
	+++ b/sys/vm/vm_map.c
	@@ -1980,6 +1980,11 @@
	&cluster_anon, 0,
	"Cluster anonymous mappings: 0 = no, 1 = yes if no hint, 2 = always");

	+static int anon_low_pref = 0;
	+SYSCTL_INT(_vm, OID_AUTO, anon_low_pref, CTLFLAG_RW,
	+ &anon_low_pref, 0,
	+ "Prefer lower addresses when clustering anonymous mappings: 0 = no, 1 = yes");
	+
	static bool
	clustering_anon_allowed(vm_offset_t addr)
	{
	@@ -2127,6 +2132,8 @@
	curr_min_addr = map->anon_loc;
	if (curr_min_addr == 0)
	cluster = false;
	+ else if (anon_low_pref)
	+ update_anon = false;
	}
	if (find_space != VMFS_NO_SPACE) {
	KASSERT(find_space == VMFS_ANY_SPACE \|\|