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More improvements to the logic for modify-bit checking. Removed
pmap_prefault() code as we don't plan to use it at this point in time. Submitted by: John Dyson <dyson>
This commit is contained in:
David Greenman
parent
7395d17b1b
commit
b596ee8d4e
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=11693
@ -39,7 +39,7 @@
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* SUCH DAMAGE.
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*
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* from: @(#)pmap.c 7.7 (Berkeley) 5/12/91
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* $Id: pmap.c,v 1.61 1995/09/15 08:31:19 davidg Exp $
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* $Id: pmap.c,v 1.62 1995/10/22 02:59:48 davidg Exp $
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*/
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/*
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@ -851,10 +851,9 @@ pmap_remove(pmap, sva, eva)
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if (pmap_is_managed(pa)) {
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if ((int) oldpte & PG_M) {
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if (sva < USRSTACK + (UPAGES * NBPG) || sva >= KERNBASE) {
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if (sva < clean_sva || sva >= clean_eva) {
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PHYS_TO_VM_PAGE(pa)->dirty |= VM_PAGE_BITS_ALL;
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}
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if (sva < USRSTACK + (UPAGES * NBPG) ||
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(sva >= KERNBASE && (sva < clean_sva || sva >= clean_eva))) {
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PHYS_TO_VM_PAGE(pa)->dirty |= VM_PAGE_BITS_ALL;
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}
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}
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pv = pa_to_pvh(pa);
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@ -931,10 +930,9 @@ pmap_remove(pmap, sva, eva)
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continue;
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}
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if ((int) oldpte & PG_M) {
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if (va < USRSTACK + (UPAGES * NBPG) || va >= KERNBASE) {
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if (va < clean_sva || va >= clean_eva) {
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PHYS_TO_VM_PAGE(pa)->dirty |= VM_PAGE_BITS_ALL;
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}
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if (sva < USRSTACK + (UPAGES * NBPG) ||
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(sva >= KERNBASE && (sva < clean_sva || sva >= clean_eva))) {
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PHYS_TO_VM_PAGE(pa)->dirty |= VM_PAGE_BITS_ALL;
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}
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}
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pv = pa_to_pvh(pa);
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@ -999,10 +997,9 @@ pmap_remove_all(pa)
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* Update the vm_page_t clean and reference bits.
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*/
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if ((int) *pte & PG_M) {
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if (va < USRSTACK + (UPAGES * NBPG) || va >= KERNBASE) {
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if (va < clean_sva || va >= clean_eva) {
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PHYS_TO_VM_PAGE(pa)->dirty |= VM_PAGE_BITS_ALL;
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}
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if (va < USRSTACK + (UPAGES * NBPG) ||
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(va >= KERNBASE && (va < clean_sva || va >= clean_eva))) {
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PHYS_TO_VM_PAGE(pa)->dirty |= VM_PAGE_BITS_ALL;
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}
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}
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*pte = 0;
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@ -1487,102 +1484,6 @@ pmap_object_init_pt(pmap, addr, object, offset, size)
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}
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}
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#if 0
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/*
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* pmap_prefault provides a quick way of clustering
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* pagefaults into a processes address space. It is a "cousin"
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* of pmap_object_init_pt, except it runs at page fault time instead
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* of mmap time.
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*/
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#define PFBAK 2
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#define PFFOR 2
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#define PAGEORDER_SIZE (PFBAK+PFFOR)
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static int pmap_prefault_pageorder[] = {
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-NBPG, NBPG, -2 * NBPG, 2 * NBPG
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};
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void
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pmap_prefault(pmap, addra, entry, object)
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pmap_t pmap;
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vm_offset_t addra;
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vm_map_entry_t entry;
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vm_object_t object;
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{
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int i;
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vm_offset_t starta, enda;
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vm_offset_t offset, addr;
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vm_page_t m;
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int pageorder_index;
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if (entry->object.vm_object != object)
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return;
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if (pmap != &curproc->p_vmspace->vm_pmap)
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return;
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starta = addra - PFBAK * NBPG;
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if (starta < entry->start) {
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starta = entry->start;
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} else if (starta > addra)
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starta = 0;
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enda = addra + PFFOR * NBPG;
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if (enda > entry->end)
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enda = entry->end;
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for (i = 0; i < PAGEORDER_SIZE; i++) {
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vm_object_t lobject;
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pt_entry_t *pte;
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addr = addra + pmap_prefault_pageorder[i];
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if (addr < starta || addr >= enda)
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continue;
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pte = vtopte(addr);
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if (*pte)
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continue;
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offset = (addr - entry->start) + entry->offset;
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lobject = object;
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for (m = vm_page_lookup(lobject, offset);
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(!m && lobject->shadow && !lobject->pager);
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lobject = lobject->shadow) {
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offset += lobject->shadow_offset;
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m = vm_page_lookup(lobject->shadow, offset);
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}
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/*
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* give-up when a page is not in memory
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*/
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if (m == NULL)
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break;
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if (((m->flags & (PG_CACHE | PG_ACTIVE | PG_INACTIVE)) != 0) &&
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((m->valid & VM_PAGE_BITS_ALL) == VM_PAGE_BITS_ALL) &&
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(m->busy == 0) &&
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(m->bmapped == 0) &&
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(m->flags & (PG_BUSY | PG_FICTITIOUS)) == 0) {
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/*
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* test results show that the system is faster when
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* pages are activated.
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*/
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if ((m->flags & PG_ACTIVE) == 0) {
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if( m->flags & PG_CACHE)
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vm_page_deactivate(m);
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else
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vm_page_activate(m);
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}
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vm_page_hold(m);
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m->flags |= PG_MAPPED;
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pmap_enter_quick(pmap, addr, VM_PAGE_TO_PHYS(m));
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vm_page_unhold(m);
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}
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}
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}
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#endif
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/*
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* Routine: pmap_change_wiring
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* Function: Change the wiring attribute for a map/virtual-address
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@ -39,7 +39,7 @@
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* SUCH DAMAGE.
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*
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* from: @(#)pmap.c 7.7 (Berkeley) 5/12/91
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* $Id: pmap.c,v 1.61 1995/09/15 08:31:19 davidg Exp $
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* $Id: pmap.c,v 1.62 1995/10/22 02:59:48 davidg Exp $
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*/
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/*
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@ -851,10 +851,9 @@ pmap_remove(pmap, sva, eva)
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if (pmap_is_managed(pa)) {
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if ((int) oldpte & PG_M) {
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if (sva < USRSTACK + (UPAGES * NBPG) || sva >= KERNBASE) {
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if (sva < clean_sva || sva >= clean_eva) {
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PHYS_TO_VM_PAGE(pa)->dirty |= VM_PAGE_BITS_ALL;
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}
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if (sva < USRSTACK + (UPAGES * NBPG) ||
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(sva >= KERNBASE && (sva < clean_sva || sva >= clean_eva))) {
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PHYS_TO_VM_PAGE(pa)->dirty |= VM_PAGE_BITS_ALL;
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}
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}
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pv = pa_to_pvh(pa);
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@ -931,10 +930,9 @@ pmap_remove(pmap, sva, eva)
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continue;
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}
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if ((int) oldpte & PG_M) {
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if (va < USRSTACK + (UPAGES * NBPG) || va >= KERNBASE) {
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if (va < clean_sva || va >= clean_eva) {
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PHYS_TO_VM_PAGE(pa)->dirty |= VM_PAGE_BITS_ALL;
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}
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if (sva < USRSTACK + (UPAGES * NBPG) ||
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(sva >= KERNBASE && (sva < clean_sva || sva >= clean_eva))) {
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PHYS_TO_VM_PAGE(pa)->dirty |= VM_PAGE_BITS_ALL;
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}
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}
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pv = pa_to_pvh(pa);
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@ -999,10 +997,9 @@ pmap_remove_all(pa)
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* Update the vm_page_t clean and reference bits.
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*/
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if ((int) *pte & PG_M) {
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if (va < USRSTACK + (UPAGES * NBPG) || va >= KERNBASE) {
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if (va < clean_sva || va >= clean_eva) {
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PHYS_TO_VM_PAGE(pa)->dirty |= VM_PAGE_BITS_ALL;
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}
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if (va < USRSTACK + (UPAGES * NBPG) ||
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(va >= KERNBASE && (va < clean_sva || va >= clean_eva))) {
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PHYS_TO_VM_PAGE(pa)->dirty |= VM_PAGE_BITS_ALL;
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}
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}
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*pte = 0;
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@ -1487,102 +1484,6 @@ pmap_object_init_pt(pmap, addr, object, offset, size)
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}
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}
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#if 0
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/*
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* pmap_prefault provides a quick way of clustering
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* pagefaults into a processes address space. It is a "cousin"
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* of pmap_object_init_pt, except it runs at page fault time instead
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* of mmap time.
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*/
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#define PFBAK 2
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#define PFFOR 2
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#define PAGEORDER_SIZE (PFBAK+PFFOR)
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static int pmap_prefault_pageorder[] = {
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-NBPG, NBPG, -2 * NBPG, 2 * NBPG
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};
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void
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pmap_prefault(pmap, addra, entry, object)
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pmap_t pmap;
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vm_offset_t addra;
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vm_map_entry_t entry;
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vm_object_t object;
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{
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int i;
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vm_offset_t starta, enda;
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vm_offset_t offset, addr;
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vm_page_t m;
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int pageorder_index;
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if (entry->object.vm_object != object)
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return;
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if (pmap != &curproc->p_vmspace->vm_pmap)
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return;
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starta = addra - PFBAK * NBPG;
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if (starta < entry->start) {
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starta = entry->start;
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} else if (starta > addra)
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starta = 0;
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enda = addra + PFFOR * NBPG;
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if (enda > entry->end)
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enda = entry->end;
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for (i = 0; i < PAGEORDER_SIZE; i++) {
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vm_object_t lobject;
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pt_entry_t *pte;
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addr = addra + pmap_prefault_pageorder[i];
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if (addr < starta || addr >= enda)
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continue;
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pte = vtopte(addr);
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if (*pte)
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continue;
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offset = (addr - entry->start) + entry->offset;
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lobject = object;
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for (m = vm_page_lookup(lobject, offset);
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(!m && lobject->shadow && !lobject->pager);
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lobject = lobject->shadow) {
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offset += lobject->shadow_offset;
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m = vm_page_lookup(lobject->shadow, offset);
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}
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/*
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* give-up when a page is not in memory
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*/
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if (m == NULL)
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break;
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if (((m->flags & (PG_CACHE | PG_ACTIVE | PG_INACTIVE)) != 0) &&
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((m->valid & VM_PAGE_BITS_ALL) == VM_PAGE_BITS_ALL) &&
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(m->busy == 0) &&
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(m->bmapped == 0) &&
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(m->flags & (PG_BUSY | PG_FICTITIOUS)) == 0) {
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/*
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* test results show that the system is faster when
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* pages are activated.
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*/
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if ((m->flags & PG_ACTIVE) == 0) {
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if( m->flags & PG_CACHE)
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vm_page_deactivate(m);
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else
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vm_page_activate(m);
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}
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vm_page_hold(m);
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m->flags |= PG_MAPPED;
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pmap_enter_quick(pmap, addr, VM_PAGE_TO_PHYS(m));
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vm_page_unhold(m);
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}
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}
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}
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#endif
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/*
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* Routine: pmap_change_wiring
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* Function: Change the wiring attribute for a map/virtual-address
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