D19194.id53922.diff
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D19194.id53922.diff
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	Index: head/sys/vm/vm_map.c
	===================================================================
	--- head/sys/vm/vm_map.c
	+++ head/sys/vm/vm_map.c
	@@ -1487,8 +1487,23 @@
	static int cluster_anon = 1;
	SYSCTL_INT(_vm, OID_AUTO, cluster_anon, CTLFLAG_RW,
	&cluster_anon, 0,
	- "Cluster anonymous mappings");
	+ "Cluster anonymous mappings: 0 = no, 1 = yes if no hint, 2 = always");

	+static bool
	+clustering_anon_allowed(vm_offset_t addr)
	+{
	+
	+ switch (cluster_anon) {
	+ case 0:
	+ return (false);
	+ case 1:
	+ return (addr == 0);
	+ case 2:
	+ default:
	+ return (true);
	+ }
	+}
	+
	static long aslr_restarts;
	SYSCTL_LONG(_vm, OID_AUTO, aslr_restarts, CTLFLAG_RD,
	&aslr_restarts, 0,
	@@ -1593,7 +1608,7 @@
	} else
	alignment = 0;
	en_aslr = (map->flags & MAP_ASLR) != 0;
	- update_anon = cluster = cluster_anon != 0 &&
	+ update_anon = cluster = clustering_anon_allowed(*addr) &&
	(map->flags & MAP_IS_SUB_MAP) == 0 && max_addr == 0 &&
	find_space != VMFS_NO_SPACE && object == NULL &&
	(cow & (MAP_INHERIT_SHARE \| MAP_STACK_GROWS_UP \|