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Zero the physical page only if it is invalid and not prezeroed.

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This commit is contained in:
Alan Cox 2004-04-25 07:58:59 +00:00
parent a3a10d1c3c
commit 8a3ef85721
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=128633
1 changed files with 9 additions and 7 deletions
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16
sys/vm/phys_pager.c
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@ -142,17 +142,19 @@ phys_pager_getpages(vm_object_t object, vm_page_t *m, int count, int reqpage)
int i;
VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
for (i = 0; i < count; i++) {
if (m[i]->valid == 0) {
if ((m[i]->flags & PG_ZERO) == 0)
pmap_zero_page(m[i]);
m[i]->valid = VM_PAGE_BITS_ALL;
}
KASSERT(m[i]->valid == VM_PAGE_BITS_ALL,
("phys_pager_getpages: partially valid page %p", m[i]));
}
vm_page_lock_queues();
for (i = 0; i < count; i++) {
if ((m[i]->flags & PG_ZERO) == 0) {
vm_page_unlock_queues();
pmap_zero_page(m[i]);
vm_page_lock_queues();
}
vm_page_flag_set(m[i], PG_ZERO);
/* Switch off pv_entries */
vm_page_unmanage(m[i]);
m[i]->valid = VM_PAGE_BITS_ALL;
m[i]->dirty = 0;
/* The requested page must remain busy, the others not. */
if (reqpage != i) {