Author: nwhitehorn
Date: Sun Oct 27 14:03:51 2013
New Revision: 257209
URL: http://svnweb.freebsd.org/changeset/base/257209
Log:
Turn on VM_KMEM_SIZE_SCALE on 32-bit as well as 64-bit PowerPC.
Requested by: alc
MFC after: 1 month
Modified:
head/sys/powerpc/include/vmparam.h
Modified: head/sys/powerpc/include/vmparam.h
==============================================================================
--- head/sys/powerpc/include/vmparam.h Sun Oct 27 10:51:34 2013
(r257208)
+++ head/sys/powerpc/include/vmparam.h Sun Oct 27 14:03:51 2013
(r257209)
@@ -112,6 +112,7 @@
#define VM_MIN_KERNEL_ADDRESS KERNBASE
#define VM_MAX_KERNEL_ADDRESS 0xf8000000
+#define VM_MAX_SAFE_KERNEL_ADDRESS VM_MAX_KERNEL_ADDRESS
#endif /* AIM/E500 */
@@ -175,14 +176,21 @@ struct pmap_physseg {
#define VM_KMEM_SIZE (12 * 1024 * 1024)
#endif
-#ifdef __powerpc64__
+/*
+ * How many physical pages per KVA page allocated.
+ * min(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE), VM_KMEM_SIZE_MAX)
+ * is the total KVA space allocated for kmem_map.
+ */
#ifndef VM_KMEM_SIZE_SCALE
-#define VM_KMEM_SIZE_SCALE (3)
+#define VM_KMEM_SIZE_SCALE (3)
#endif
+/*
+ * Ceiling on the amount of kmem_map KVA space: 40% of the entire KVA space.
+ */
#ifndef VM_KMEM_SIZE_MAX
-#define VM_KMEM_SIZE_MAX 0x1c0000000 /* 7 GB */
-#endif
+#define VM_KMEM_SIZE_MAX ((VM_MAX_SAFE_KERNEL_ADDRESS - \
+ VM_MIN_KERNEL_ADDRESS + 1) * 2 / 5)
#endif
#define ZERO_REGION_SIZE (64 * 1024) /* 64KB */
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