Be more aggressive in using superpages in all mappings of objects:

- Add a new address space allocation method (VMFS_OPTIMAL_SPACE) for
  vm_map_find() that will try to alter the alignment of a mapping to match
  any existing superpage mappings of the object being mapped.  If no
  suitable address range is found with the necessary alignment,
  vm_map_find() will fall back to using the simple first-fit strategy
  (VMFS_ANY_SPACE).
- Change mmap() without MAP_FIXED, shmat(), and the GEM mapping ioctl to
  use VMFS_OPTIMAL_SPACE instead of VMFS_ANY_SPACE.

Reviewed by:	alc (earlier version)
MFC after:	2 weeks

1 files changed, 1 insertions, 1 deletions

diff --git a/sys/kern/sysv_shm.c b/sys/kern/sysv_shm.c
index a1c6b34f03cb..90f5d7764fdc 100644
--- a/sys/kern/sysv_shm.c
+++ b/sys/kern/sysv_shm.c
@@ -414,7 +414,7 @@ kern_shmat(td, shmid, shmaddr, shmflg)
 	vm_object_reference(shmseg->object);
 	rv = vm_map_find(&p->p_vmspace->vm_map, shmseg->object,
 	    0, &attach_va, size, (flags & MAP_FIXED) ? VMFS_NO_SPACE :
-	    VMFS_ANY_SPACE, prot, prot, MAP_INHERIT_SHARE);
+	    VMFS_OPTIMAL_SPACE, prot, prot, MAP_INHERIT_SHARE);
 	if (rv != KERN_SUCCESS) {
 		vm_object_deallocate(shmseg->object);
 		error = ENOMEM;