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For efficiency move the call to pmap_pte_quick() out of pmap_protect()'s

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and pmap_remove()'s inner loop.

Reviewed by: peter@, tegge@
This commit is contained in:
Alan Cox 2004-12-02 03:29:17 +00:00
parent f8c60df7a6
commit 4878c3cdba
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=138303
1 changed files with 6 additions and 7 deletions
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13
sys/i386/i386/pmap.c
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@ -1673,9 +1673,9 @@ pmap_remove(pmap_t pmap, vm_offset_t sva, vm_offset_t eva)
if (pdnxt > eva)
pdnxt = eva;
for (; sva != pdnxt; sva += PAGE_SIZE) {
if ((pte = pmap_pte_quick(pmap, sva)) == NULL ||
*pte == 0)
for (pte = pmap_pte_quick(pmap, sva); sva != pdnxt; pte++,
sva += PAGE_SIZE) {
if (*pte == 0)
continue;
anyvalid = 1;
if (pmap_remove_pte(pmap, pte, sva))
@ -1765,6 +1765,7 @@ pmap_protect(pmap_t pmap, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot)
{
vm_offset_t pdnxt;
pd_entry_t ptpaddr;
pt_entry_t *pte;
int anychanged;
if ((prot & VM_PROT_READ) == VM_PROT_NONE) {
@ -1808,12 +1809,10 @@ pmap_protect(pmap_t pmap, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot)
if (pdnxt > eva)
pdnxt = eva;
for (; sva != pdnxt; sva += PAGE_SIZE) {
pt_entry_t *pte;
for (pte = pmap_pte_quick(pmap, sva); sva != pdnxt; pte++,
sva += PAGE_SIZE) {
vm_page_t m;
if ((pte = pmap_pte_quick(pmap, sva)) == NULL)
continue;
retry:
/*
* Regardless of whether a pte is 32 or 64 bits in