Use an UMA zone for the radix node. This avoids the problem to check

for the kernel_map/kmem_map recursion because it uses direct mapping
provided by amd64 to avoid object and map search and recursion.

Probabilly all the others architectures using UMA_MD_SMALL_ALLOC are also
fixed by this, but other remains, where the most notable case is i386.
For it a solution has still to be determined.  A way to do this would
be to have a reserved map just for radix node and mark all accesses to
its lock to be witness safe, but that would still be unoptimal due to
the large amount of virtual address space needed to cater the whole
tree.

1 files changed, 1 insertions, 0 deletions

diff --git a/sys/vm/vm_radix.h b/sys/vm/vm_radix.h
index 930ec3c..0ae692d 100644
--- a/sys/vm/vm_radix.h
+++ b/sys/vm/vm_radix.h
@@ -52,6 +52,7 @@ struct vm_radix {
 	int 	rt_height; 			/* Number of levels + 1. */
 };
 
+void	vm_radix_init(void);
 int 	vm_radix_insert(struct vm_radix *, vm_pindex_t, void *);
 void	*vm_radix_remove(struct vm_radix *, vm_pindex_t);
 void	*vm_radix_lookup(struct vm_radix *, vm_pindex_t);