svn commit: r246204 - head/sys/arm/include

[Andre Oppermann]

Author: andre
Date: Fri Feb  1 10:26:31 2013
New Revision: 246204
URL: http://svnweb.freebsd.org/changeset/base/246204

Log:
  Add VM_KMEM_SIZE_SCALE parameter set to 2 (50%) for all ARM platforms.
  
  VM_KMEM_SIZE_SCALE specifies which fraction of the available physical
  memory, after deduction of the kernel itself and other early statically
  allocated memory, can be used for the kmem_map.  The kmem_map provides
  for all UMA/malloc allocations in KVM space.
  
  Previously ARM was using a fixed kmem_map size of (12*1024*1024) = 12MB
  without regard to effectively available memory.  This is too small for
  recent ARM SoC with more than 128MB of RAM.
  
  For reference a description of others related kmem_map parameters:
  
   VM_KMEM_SIZE		default start size of kmem_map if SCALE is
  			not defined
   VM_KMEM_SIZE_MIN	hard floor on the kmem_map size
   VM_KMEM_SIZE_MAX	hard ceiling on the kmem_map size
   VM_KMEM_SIZE_SCALE	fraction of the available real memory to
  			be used for the kmem_map, limited by the
  			MIN and MAX parameters.
  
  Tested by:	ian
  MFC after:	1 week

Modified:
  head/sys/arm/include/vmparam.h

Modified: head/sys/arm/include/vmparam.h
==============================================================================
--- head/sys/arm/include/vmparam.h	Fri Feb  1 10:00:21 2013	(r246203)
+++ head/sys/arm/include/vmparam.h	Fri Feb  1 10:26:31 2013	(r246204)
@@ -134,12 +134,15 @@
 #endif
 
 #define VM_MAX_KERNEL_ADDRESS	0xffffffff
+
 /*
  * Virtual size (bytes) for various kernel submaps.
  */
-
 #ifndef VM_KMEM_SIZE
-#define VM_KMEM_SIZE            (12*1024*1024)
+#define VM_KMEM_SIZE		(12*1024*1024)
+#endif
+#ifndef VM_KMEM_SIZE_SCALE
+#define VM_KMEM_SIZE_SCALE	(2)
 #endif
 
 #define MAXTSIZ 	(16*1024*1024)