From b8e7fc24fe7ebc11bf82aa8c7421c3f53a4522dd Mon Sep 17 00:00:00 2001
From: Alan Cox <alc@FreeBSD.org>
Date: Thu, 27 Dec 2007 16:45:39 +0000
Subject: [PATCH] Add configuration knobs for the superpage reservation system.
  Initially, the reservation will only be enabled on amd64.

---
 sys/amd64/include/vmparam.h   | 14 ++++++++++++++
 sys/arm/include/vmparam.h     |  7 +++++++
 sys/conf/options              |  2 ++
 sys/i386/include/vmparam.h    | 19 +++++++++++++++++++
 sys/ia64/include/vmparam.h    |  7 +++++++
 sys/powerpc/include/vmparam.h |  7 +++++++
 sys/sparc64/include/vmparam.h |  7 +++++++
 sys/sun4v/include/vmparam.h   |  7 +++++++
 8 files changed, 70 insertions(+)

diff --git a/sys/amd64/include/vmparam.h b/sys/amd64/include/vmparam.h
index 50962e5d0385..712b54b8f283 100644
--- a/sys/amd64/include/vmparam.h
+++ b/sys/amd64/include/vmparam.h
@@ -131,6 +131,20 @@
  */
 #define	VM_NFREEORDER		13
 
+/*
+ * Enable superpage reservations: 1 level.
+ */
+#ifndef	VM_NRESERVLEVEL
+#define	VM_NRESERVLEVEL		1
+#endif
+
+/*
+ * Level 0 reservations consist of 512 pages.
+ */
+#ifndef	VM_LEVEL_0_ORDER
+#define	VM_LEVEL_0_ORDER	9
+#endif
+
 /*
  * Virtual addresses of things.  Derived from the page directory and
  * page table indexes from pmap.h for precision.
diff --git a/sys/arm/include/vmparam.h b/sys/arm/include/vmparam.h
index 35b8d41954c5..a3d84252d01a 100644
--- a/sys/arm/include/vmparam.h
+++ b/sys/arm/include/vmparam.h
@@ -85,6 +85,13 @@
  */
 #define	VM_NFREEORDER		9
 
+/*
+ * Disable superpage reservations.
+ */
+#ifndef	VM_NRESERVLEVEL
+#define	VM_NRESERVLEVEL		0
+#endif
+
 #define UPT_MAX_ADDRESS		VADDR(UPTPTDI + 3, 0)
 #define UPT_MIN_ADDRESS		VADDR(UPTPTDI, 0)
 
diff --git a/sys/conf/options b/sys/conf/options
index e76c61eb4dea..ea316454abc8 100644
--- a/sys/conf/options
+++ b/sys/conf/options
@@ -551,6 +551,8 @@ VFS_BIO_DEBUG		opt_global.h
 VM_KMEM_SIZE		opt_vm.h
 VM_KMEM_SIZE_SCALE	opt_vm.h
 VM_KMEM_SIZE_MAX	opt_vm.h
+VM_NRESERVLEVEL		opt_vm.h
+VM_LEVEL_0_ORDER	opt_vm.h
 NO_SWAPPING		opt_vm.h
 MALLOC_MAKE_FAILURES	opt_vm.h
 MALLOC_PROFILE		opt_vm.h
diff --git a/sys/i386/include/vmparam.h b/sys/i386/include/vmparam.h
index 2aa2848a1100..6ab27cc9c4ab 100644
--- a/sys/i386/include/vmparam.h
+++ b/sys/i386/include/vmparam.h
@@ -122,6 +122,25 @@
 #define	VM_NFREEORDER		11
 #endif
 
+/*
+ * Disable superpage reservations.
+ */
+#ifndef	VM_NRESERVLEVEL
+#define	VM_NRESERVLEVEL		0
+#endif
+
+/*
+ * Level 0 reservations consist of 512 pages under PAE and 1024 pages
+ * otherwise.
+ */
+#ifndef	VM_LEVEL_0_ORDER
+#ifdef PAE
+#define	VM_LEVEL_0_ORDER	9
+#else
+#define	VM_LEVEL_0_ORDER	10
+#endif
+#endif
+
 /*
  * Kernel physical load address.
  */
diff --git a/sys/ia64/include/vmparam.h b/sys/ia64/include/vmparam.h
index c7dac2c8e3d3..44ae5d8cb658 100644
--- a/sys/ia64/include/vmparam.h
+++ b/sys/ia64/include/vmparam.h
@@ -144,6 +144,13 @@
  */
 #define	VM_NFREEORDER		16
 
+/*
+ * Disable superpage reservations.
+ */
+#ifndef	VM_NRESERVLEVEL
+#define	VM_NRESERVLEVEL		0
+#endif
+
 /*
  * Manipulating region bits of an address.
  */
diff --git a/sys/powerpc/include/vmparam.h b/sys/powerpc/include/vmparam.h
index 0f8298e05c55..212624f984c9 100644
--- a/sys/powerpc/include/vmparam.h
+++ b/sys/powerpc/include/vmparam.h
@@ -131,6 +131,13 @@ struct pmap_physseg {
  */
 #define	VM_NFREEORDER		11
 
+/*
+ * Disable superpage reservations.
+ */
+#ifndef	VM_NRESERVLEVEL
+#define	VM_NRESERVLEVEL		0
+#endif
+
 #ifndef VM_INITIAL_PAGEIN
 #define	VM_INITIAL_PAGEIN	16
 #endif
diff --git a/sys/sparc64/include/vmparam.h b/sys/sparc64/include/vmparam.h
index 5609e8e9ec11..0f1f37a92bed 100644
--- a/sys/sparc64/include/vmparam.h
+++ b/sys/sparc64/include/vmparam.h
@@ -121,6 +121,13 @@
  */
 #define	VM_NFREEORDER		12
 
+/*
+ * Disable superpage reservations.
+ */
+#ifndef	VM_NRESERVLEVEL
+#define	VM_NRESERVLEVEL		0
+#endif
+
 /*
  * Address space layout.
  *
diff --git a/sys/sun4v/include/vmparam.h b/sys/sun4v/include/vmparam.h
index a994401eb33a..61d4937f9b2e 100644
--- a/sys/sun4v/include/vmparam.h
+++ b/sys/sun4v/include/vmparam.h
@@ -121,6 +121,13 @@
  */
 #define	VM_NFREEORDER		12
 
+/*
+ * Disable superpage reservations.
+ */
+#ifndef	VM_NRESERVLEVEL
+#define	VM_NRESERVLEVEL		0
+#endif
+
 /*
  * Address space layout.
  *