make sure PT page is marked clean at allocation to avoid pageout

SCCS-vsn: sys/hp300/hp300/pmap.c 7.16

diff --git a/usr/src/sys/hp300/hp300/pmap.c b/usr/src/sys/hp300/hp300/pmap.c
index 12836ef..4a4de87 100644 (file)
--- a/usr/src/sys/hp300/hp300/pmap.c
+++ b/usr/src/sys/hp300/hp300/pmap.c
@@ -8,7 +8,7 @@
  *
  * %sccs.include.redist.c%
  *
  *
  * %sccs.include.redist.c%
  *

- *     @(#)pmap.c      7.15 (Berkeley) %G%
+ *     @(#)pmap.c      7.16 (Berkeley) %G%

  */
 
 /*
  */
 
 /*


@@ -1029,8 +1029,8 @@ pmap_enter(pmap, va, pa, prot, wired)
         * is a valid mapping in the page.
         */
        if (pmap != kernel_pmap)
         * is a valid mapping in the page.
         */
        if (pmap != kernel_pmap)

-               vm_map_pageable(pt_map, trunc_page(pte),
-                               round_page(pte+1), FALSE);
+               (void) vm_map_pageable(pt_map, trunc_page(pte),
+                                      round_page(pte+1), FALSE);

 
        /*
         * Enter on the PV list if part of our managed memory
 
        /*
         * Enter on the PV list if part of our managed memory


@@ -1845,8 +1845,8 @@ pmap_remove_mapping(pmap, va, pte, flags)
         * PT page.
         */
        if (pmap != kernel_pmap) {
         * PT page.
         */
        if (pmap != kernel_pmap) {

-               vm_map_pageable(pt_map, trunc_page(pte),
-                               round_page(pte+1), TRUE);
+               (void) vm_map_pageable(pt_map, trunc_page(pte),
+                                      round_page(pte+1), TRUE);

 #ifdef DEBUG
                if (pmapdebug & PDB_WIRING)
                        pmap_check_wiring("remove", trunc_page(pte));
 #ifdef DEBUG
                if (pmapdebug & PDB_WIRING)
                        pmap_check_wiring("remove", trunc_page(pte));


@@ -2322,17 +2322,19 @@ pmap_enter_ptpage(pmap, va)
 #ifdef DEBUG
                if (pmapdebug & (PDB_ENTER|PDB_PTPAGE))
                        printf("enter: about to fault UPT pg at %x\n", va);
 #ifdef DEBUG
                if (pmapdebug & (PDB_ENTER|PDB_PTPAGE))
                        printf("enter: about to fault UPT pg at %x\n", va);

+#endif

                s = vm_fault(pt_map, va, VM_PROT_READ|VM_PROT_WRITE, FALSE);
                if (s != KERN_SUCCESS) {
                        printf("vm_fault(pt_map, %x, RW, 0) -> %d\n", va, s);
                        panic("pmap_enter: vm_fault failed");
                }
                s = vm_fault(pt_map, va, VM_PROT_READ|VM_PROT_WRITE, FALSE);
                if (s != KERN_SUCCESS) {
                        printf("vm_fault(pt_map, %x, RW, 0) -> %d\n", va, s);
                        panic("pmap_enter: vm_fault failed");
                }

-#else
-               if (vm_fault(pt_map, va, VM_PROT_READ|VM_PROT_WRITE, FALSE)
-                   != KERN_SUCCESS)
-                       panic("pmap_enter: vm_fault failed");
-#endif

                ptpa = pmap_extract(kernel_pmap, va);
                ptpa = pmap_extract(kernel_pmap, va);

+               /*
+                * Mark the page clean now to avoid its pageout (and
+                * hence creation of a pager) between now and when it
+                * is wired; i.e. while it is on a paging queue.
+                */
+               PHYS_TO_VM_PAGE(ptpa)->flags |= PG_CLEAN;

 #ifdef DEBUG
                PHYS_TO_VM_PAGE(ptpa)->flags |= PG_PTPAGE;
 #endif
 #ifdef DEBUG
                PHYS_TO_VM_PAGE(ptpa)->flags |= PG_PTPAGE;
 #endif