Remove the hash_rand field from struct vm_object. As of revision 1.215 of

vm/vm_page.c, it is unused.

2 files changed, 1 insertions, 13 deletions

diff --git a/sys/vm/vm_object.c b/sys/vm/vm_object.c
index 550b5d0..a6e0d51 100644
--- a/sys/vm/vm_object.c
+++ b/sys/vm/vm_object.c
@@ -190,8 +190,7 @@ vm_object_zinit(void *mem, int size)
 void
 _vm_object_allocate(objtype_t type, vm_pindex_t size, vm_object_t object)
 {
-	static int object_hash_rand;
-	int exp, incr;
+	int incr;
 
 	TAILQ_INIT(&object->memq);
 	TAILQ_INIT(&object->shadow_head);
@@ -214,16 +213,6 @@ _vm_object_allocate(objtype_t type, vm_pindex_t size, vm_object_t object)
 	object->handle = NULL;
 	object->backing_object = NULL;
 	object->backing_object_offset = (vm_ooffset_t) 0;
-	/*
-	 * Try to generate a number that will spread objects out in the
-	 * hash table.  We 'wipe' new objects across the hash in 128 page
-	 * increments plus 1 more to offset it a little more by the time
-	 * it wraps around.
-	 */
-	do {
-		exp = object_hash_rand;
-		object->hash_rand = exp - 129;
-	} while (!atomic_cmpset_int(&object_hash_rand, exp, object->hash_rand));
 
 	atomic_add_int(&object->generation, 1);
 
diff --git a/sys/vm/vm_object.h b/sys/vm/vm_object.h
index f1a5351..9f4e488 100644
--- a/sys/vm/vm_object.h
+++ b/sys/vm/vm_object.h
@@ -97,7 +97,6 @@ struct vm_object {
 	vm_pindex_t size;		/* Object size */
 	int ref_count;			/* How many refs?? */
 	int shadow_count;		/* how many objects that this is a shadow for */
-	int hash_rand;			/* (c) hash table randomizer */
 	objtype_t type;			/* type of pager */
 	u_short flags;			/* see below */
 	u_short pg_color;		/* (c) color of first page in obj */