Merge from vmc-playground branch:

Replace the sub-optimal uma_zone_set_obj() primitive with more modern
uma_zone_reserve_kva().  The new primitive reserves before hand
the necessary KVA space to cater the zone allocations and allocates pages
with ALLOC_NOOBJ.  More specifically:
- uma_zone_reserve_kva() does not need an object to cater the backend
  allocator.
- uma_zone_reserve_kva() can cater M_WAITOK requests, in order to
  serve zones which need to do uma_prealloc() too.
- When possible, uma_zone_reserve_kva() uses directly the direct-mapping
  by uma_small_alloc() rather than relying on the KVA / offset
  combination.

The removal of the object attribute allows 2 further changes:
1) _vm_object_allocate() becomes static within vm_object.c
2) VM_OBJECT_LOCK_INIT() is removed.  This function is replaced by
   direct calls to mtx_init() as there is no need to export it anymore
   and the calls aren't either homogeneous anymore: there are now small
   differences between arguments passed to mtx_init().

Sponsored by:	EMC / Isilon storage division
Reviewed by:	alc (which also offered almost all the comments)
Tested by:	pho, jhb, davide

1 files changed, 2 insertions, 2 deletions

diff --git a/sys/vm/uma_int.h b/sys/vm/uma_int.h
index aaec926..b8c2be0 100644
--- a/sys/vm/uma_int.h
+++ b/sys/vm/uma_int.h
@@ -221,8 +221,8 @@ struct uma_keg {
 	uma_alloc	uk_allocf;	/* Allocation function */
 	uma_free	uk_freef;	/* Free routine */
 
-	struct vm_object	*uk_obj;	/* Zone specific object */
-	vm_offset_t	uk_kva;		/* Base kva for zones with objs */
+	u_long		uk_offset;	/* Next free offset from base KVA */
+	vm_offset_t	uk_kva;		/* Zone base KVA */
 	uma_zone_t	uk_slabzone;	/* Slab zone backing us, if OFFPAGE */
 
 	u_int16_t	uk_pgoff;	/* Offset to uma_slab struct */