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)
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