Zero the physical page only if it is invalid and not prezeroed.
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8a3ef85721
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=128633
@ -142,17 +142,19 @@ phys_pager_getpages(vm_object_t object, vm_page_t *m, int count, int reqpage)
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int i;
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VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
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for (i = 0; i < count; i++) {
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if (m[i]->valid == 0) {
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if ((m[i]->flags & PG_ZERO) == 0)
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pmap_zero_page(m[i]);
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m[i]->valid = VM_PAGE_BITS_ALL;
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}
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KASSERT(m[i]->valid == VM_PAGE_BITS_ALL,
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("phys_pager_getpages: partially valid page %p", m[i]));
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}
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vm_page_lock_queues();
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for (i = 0; i < count; i++) {
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if ((m[i]->flags & PG_ZERO) == 0) {
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vm_page_unlock_queues();
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pmap_zero_page(m[i]);
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vm_page_lock_queues();
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}
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vm_page_flag_set(m[i], PG_ZERO);
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/* Switch off pv_entries */
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vm_page_unmanage(m[i]);
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m[i]->valid = VM_PAGE_BITS_ALL;
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m[i]->dirty = 0;
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/* The requested page must remain busy, the others not. */
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if (reqpage != i) {
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