MFC r257854 (discussed with alc@)

  As of r257209, all architectures have defined
  VM_KMEM_SIZE_SCALE.  In other words, every architecture is now
  auto-sizing the kmem arena.  This revision changes kmeminit() so
  that the definition of VM_KMEM_SIZE_SCALE becomes mandatory and
  the definition of VM_KMEM_SIZE becomes optional.

  Replace or eliminate all existing definitions of VM_KMEM_SIZE.
  With auto-sizing enabled, VM_KMEM_SIZE effectively became an
  alternate spelling for VM_KMEM_SIZE_MIN on most architectures.
  Use VM_KMEM_SIZE_MIN for clarity.

1 files changed, 3 insertions, 10 deletions

diff --git a/sys/amd64/include/vmparam.h b/sys/amd64/include/vmparam.h
index 474ea4b..bda9722 100644
--- a/sys/amd64/include/vmparam.h
+++ b/sys/amd64/include/vmparam.h
@@ -178,23 +178,16 @@
 #define	PHYS_TO_DMAP(x)		((x) | DMAP_MIN_ADDRESS)
 #define	DMAP_TO_PHYS(x)		((x) & ~DMAP_MIN_ADDRESS)
 
-/* virtual sizes (bytes) for various kernel submaps */
-#ifndef VM_KMEM_SIZE
-#define	VM_KMEM_SIZE		(12 * 1024 * 1024)
-#endif
-
 /*
- * How many physical pages per KVA page allocated.
- * min(max(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE),
- *     VM_KMEM_SIZE_MIN), VM_KMEM_SIZE_MAX)
- * is the total KVA space allocated for kmem_map.
+ * How many physical pages per kmem arena virtual page.
  */
 #ifndef VM_KMEM_SIZE_SCALE
 #define	VM_KMEM_SIZE_SCALE	(1)
 #endif
 
 /*
- * Ceiling on amount of kmem_map kva space.
+ * Optional ceiling (in bytes) on the size of the kmem arena: 60% of the
+ * kernel map.
  */
 #ifndef VM_KMEM_SIZE_MAX
 #define	VM_KMEM_SIZE_MAX	((VM_MAX_KERNEL_ADDRESS - \