This set of commits to the VM system does the following, and contain

contributions or ideas from Stephen McKay <syssgm@devetir.qld.gov.au>,
Alan Cox <alc@cs.rice.edu>, David Greenman <davidg@freebsd.org> and me:

	More usage of the TAILQ macros.  Additional minor fix to queue.h.
	Performance enhancements to the pageout daemon.
		Addition of a wait in the case that the pageout daemon
		has to run immediately.
		Slightly modify the pageout algorithm.
	Significant revamp of the pmap/fork code:
		1) PTE's and UPAGES's are NO LONGER in the process's map.
		2) PTE's and UPAGES's reside in their own objects.
		3) TOTAL elimination of recursive page table pagefaults.
		4) The page directory now resides in the PTE object.
		5) Implemented pmap_copy, thereby speeding up fork time.
		6) Changed the pv entries so that the head is a pointer
		   and not an entire entry.
		7) Significant cleanup of pmap_protect, and pmap_remove.
		8) Removed significant amounts of machine dependent
		   fork code from vm_glue.  Pushed much of that code into
		   the machine dependent pmap module.
		9) Support more completely the reuse of already zeroed
		   pages (Page table pages and page directories) as being
		   already zeroed.
	Performance and code cleanups in vm_map:
		1) Improved and simplified allocation of map entries.
		2) Improved vm_map_copy code.
		3) Corrected some minor problems in the simplify code.
	Implemented splvm (combo of splbio and splimp.)  The VM code now
		seldom uses splhigh.
	Improved the speed of and simplified kmem_malloc.
	Minor mod to vm_fault to avoid using pre-zeroed pages in the case
		of objects with backing objects along with the already
		existant condition of having a vnode.  (If there is a backing
		object, there will likely be a COW...  With a COW, it isn't
		necessary to start with a pre-zeroed page.)
	Minor reorg of source to perhaps improve locality of ref.

1 files changed, 7 insertions, 8 deletions

diff --git a/sys/i386/include/pmap.h b/sys/i386/include/pmap.h
index a843fbf..f0d7fe6 100644
--- a/sys/i386/include/pmap.h
+++ b/sys/i386/include/pmap.h
@@ -42,7 +42,7 @@
  *
  *	from: hp300: @(#)pmap.h	7.2 (Berkeley) 12/16/90
  *	from: @(#)pmap.h	7.4 (Berkeley) 5/12/91
- * 	$Id: pmap.h,v 1.37 1996/05/02 14:20:04 phk Exp $
+ * 	$Id: pmap.h,v 1.38 1996/05/02 22:25:18 phk Exp $
  */
 
 #ifndef _MACHINE_PMAP_H_
@@ -69,6 +69,7 @@
 
 /* Our various interpretations of the above */
 #define PG_W		PG_AVAIL1	/* "Wired" pseudoflag */
+#define	PG_MANAGED	PG_AVAIL2
 #define	PG_FRAME	(~PAGE_MASK)
 #define	PG_PROT		(PG_RW|PG_U)	/* all protection bits . */
 #define PG_N		(PG_NC_PWT|PG_NC_PCD)	/* Non-cacheable */
@@ -87,12 +88,8 @@
 #define VADDR(pdi, pti) ((vm_offset_t)(((pdi)<<PDRSHIFT)|((pti)<<PAGE_SHIFT)))
 
 #ifndef NKPT
-#if 0
-#define	NKPT			26	/* actual number of kernel page tables */
-#else
 #define	NKPT			9	/* actual number of kernel page tables */
 #endif
-#endif
 #ifndef NKPDE
 #define NKPDE			63	/* addressable number of page tables/pde's */
 #endif
@@ -119,6 +116,7 @@
 typedef unsigned int *pd_entry_t;
 typedef unsigned int *pt_entry_t;
 struct vm_map;
+struct vm_object;
 
 #define PDESIZE		sizeof(pd_entry_t) /* for assembly files */
 #define PTESIZE		sizeof(pt_entry_t) /* for assembly files */
@@ -168,6 +166,7 @@ pmap_kextract(vm_offset_t va)
 
 struct pmap {
 	pd_entry_t		*pm_pdir;	/* KVA of page directory */
+	vm_object_t		pm_pteobj;	/* Container for pte's */
 	short			pm_dref;	/* page directory ref count */
 	short			pm_count;	/* pmap reference count */
 	struct pmap_statistics	pm_stats;	/* pmap statistics */
@@ -203,7 +202,7 @@ extern pt_entry_t *CMAP1;
 extern vm_offset_t avail_end;
 extern vm_offset_t avail_start;
 extern vm_offset_t phys_avail[];
-extern pv_entry_t pv_table;	/* array of entries, one per page */
+extern pv_entry_t *pv_table;	/* array of entries, one per page */
 extern vm_offset_t virtual_avail;
 extern vm_offset_t virtual_end;
 
@@ -217,8 +216,8 @@ struct pcb;
 void	pmap_bootstrap __P(( vm_offset_t, vm_offset_t));
 pmap_t	pmap_kernel __P((void));
 void	*pmap_mapdev __P((vm_offset_t, vm_size_t));
-pt_entry_t * __pure pmap_pte __P((pmap_t, vm_offset_t)) __pure2;
-void	pmap_unuse_pt __P((pmap_t, vm_offset_t, vm_page_t));
+unsigned * __pure pmap_pte __P((pmap_t, vm_offset_t)) __pure2;
+int	pmap_unuse_pt __P((pmap_t, vm_offset_t, vm_page_t));
 vm_page_t pmap_use_pt __P((pmap_t, vm_offset_t));
 
 #endif /* KERNEL */