From f3fd831cddc413c30ae03db66c7536019b1bba7a Mon Sep 17 00:00:00 2001
From: Alan Cox <alc@FreeBSD.org>
Date: Thu, 25 Sep 2003 02:51:06 +0000
Subject: [PATCH]  - Eliminate the pte object.  - Use kmem_alloc_nofault()
 rather than kmem_alloc_pageable() to allocate    KVA space for the page
 directory page(s).  Submitted by: tegge

---
 sys/i386/acpica/acpi_wakeup.c |  9 ---------
 sys/i386/i386/pmap.c          | 36 +++++++++++++++++------------------
 sys/i386/include/pmap.h       |  1 -
 3 files changed, 18 insertions(+), 28 deletions(-)

diff --git a/sys/i386/acpica/acpi_wakeup.c b/sys/i386/acpica/acpi_wakeup.c
index 00242870e18b..9a11f42b2816 100644
--- a/sys/i386/acpica/acpi_wakeup.c
+++ b/sys/i386/acpica/acpi_wakeup.c
@@ -188,7 +188,6 @@ acpi_sleep_machdep(struct acpi_softc *sc, int state)
 	vm_page_t		page;
 	static vm_page_t	opage = NULL;
 	int			ret = 0;
-	int			pteobj_allocated = 0;
 	u_int32_t		cr3;
 	u_long			ef;
 	struct proc		*p;
@@ -211,10 +210,6 @@ acpi_sleep_machdep(struct acpi_softc *sc, int state)
 #else
 	load_cr3(vtophys(pm->pm_pdir));
 #endif
-	if (pm->pm_pteobj == NULL) {
-		pm->pm_pteobj = vm_object_allocate(OBJT_DEFAULT, PTDPTDI + 1);
-		pteobj_allocated = 1;
-	}
 
 	oldphys = pmap_extract(pm, sc->acpi_wakephys);
 	if (oldphys)
@@ -290,10 +285,6 @@ out:
 			   VM_PROT_READ | VM_PROT_WRITE, 0);
 	}
 
-	if (pteobj_allocated) {
-		vm_object_deallocate(pm->pm_pteobj);
-		pm->pm_pteobj = NULL;
-	}
 	load_cr3(cr3);
 
 	write_eflags(ef);
diff --git a/sys/i386/i386/pmap.c b/sys/i386/i386/pmap.c
index fad1e3d6bb45..3e19ba739e08 100644
--- a/sys/i386/i386/pmap.c
+++ b/sys/i386/i386/pmap.c
@@ -1091,7 +1091,7 @@ pmap_pinit(pmap)
 	 * page directory table.
 	 */
 	if (pmap->pm_pdir == NULL) {
-		pmap->pm_pdir = (pd_entry_t *)kmem_alloc_pageable(kernel_map,
+		pmap->pm_pdir = (pd_entry_t *)kmem_alloc_nofault(kernel_map,
 		    NBPTD);
 #ifdef PAE
 		pmap->pm_pdpt = uma_zalloc(pdptzone, M_WAITOK | M_ZERO);
@@ -1103,13 +1103,6 @@ pmap_pinit(pmap)
 #endif
 	}
 
-	/*
-	 * allocate object for the ptes
-	 */
-	if (pmap->pm_pteobj == NULL)
-		pmap->pm_pteobj = vm_object_allocate(OBJT_DEFAULT, PTDPTDI +
-		    NPGPTD);
-
 	/*
 	 * allocate the page directory page(s)
 	 */
@@ -1187,9 +1180,10 @@ _pmap_allocpte(pmap, ptepindex)
 	/*
 	 * Find or fabricate a new pagetable page
 	 */
-	VM_OBJECT_LOCK(pmap->pm_pteobj);
-	m = vm_page_grab(pmap->pm_pteobj, ptepindex,
-	    VM_ALLOC_WIRED | VM_ALLOC_ZERO | VM_ALLOC_RETRY);
+	m = vm_page_alloc(NULL, ptepindex,
+	    VM_ALLOC_WIRED | VM_ALLOC_ZERO | VM_ALLOC_NOOBJ);
+	if (m == NULL)
+		return (m);
 	if ((m->flags & PG_ZERO) == 0)
 		pmap_zero_page(m);
 
@@ -1218,7 +1212,6 @@ _pmap_allocpte(pmap, ptepindex)
 	vm_page_flag_clear(m, PG_ZERO);
 	vm_page_wakeup(m);
 	vm_page_unlock_queues();
-	VM_OBJECT_UNLOCK(pmap->pm_pteobj);
 
 	return m;
 }
@@ -1234,7 +1227,7 @@ pmap_allocpte(pmap_t pmap, vm_offset_t va)
 	 * Calculate pagetable page index
 	 */
 	ptepindex = va >> PDRSHIFT;
-
+retry:
 	/*
 	 * Get the page directory entry
 	 */
@@ -1257,12 +1250,16 @@ pmap_allocpte(pmap_t pmap, vm_offset_t va)
 	if (ptepa) {
 		m = PHYS_TO_VM_PAGE(ptepa);
 		m->hold_count++;
-		return m;
+	} else {
+		/*
+		 * Here if the pte page isn't mapped, or if it has
+		 * been deallocated. 
+		 */
+		m = _pmap_allocpte(pmap, ptepindex);
+		if (m == NULL)
+			goto retry;
 	}
-	/*
-	 * Here if the pte page isn't mapped, or if it has been deallocated.
-	 */
-	return _pmap_allocpte(pmap, ptepindex);
+	return (m);
 }
 
 
@@ -2086,6 +2083,7 @@ pmap_enter_quick(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_page_t mpte)
 		if (mpte && (mpte->pindex == ptepindex)) {
 			mpte->hold_count++;
 		} else {
+retry:
 			/*
 			 * Get the page directory entry
 			 */
@@ -2102,6 +2100,8 @@ pmap_enter_quick(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_page_t mpte)
 				mpte->hold_count++;
 			} else {
 				mpte = _pmap_allocpte(pmap, ptepindex);
+				if (mpte == NULL)
+					goto retry;
 			}
 		}
 	} else {
diff --git a/sys/i386/include/pmap.h b/sys/i386/include/pmap.h
index 58e9182e22cf..3437a8cd7781 100644
--- a/sys/i386/include/pmap.h
+++ b/sys/i386/include/pmap.h
@@ -281,7 +281,6 @@ struct md_page {
 
 struct pmap {
 	pd_entry_t		*pm_pdir;	/* KVA of page directory */
-	vm_object_t		pm_pteobj;	/* Container for pte's */
 	TAILQ_HEAD(,pv_entry)	pm_pvlist;	/* list of mappings in pmap */
 	u_int			pm_active;	/* active on cpus */
 	struct pmap_statistics	pm_stats;	/* pmap statistics */