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- Use pagezero() instead of bzero() in pmap_pinit(). (pagezero() is much

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faster.)
MFi386:
 - Don't bother clearing PG_ZERO on the page table page in
   _pmap_allocpte(); it serves no purpose.
 - Don't bother clearing and setting PG_BUSY on page table directory pages.
This commit is contained in:
Alan Cox 2004-01-01 07:08:52 +00:00
parent de77c1ba47
commit f79f3abcbf
1 changed files with 1 additions and 6 deletions
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7
sys/amd64/amd64/pmap.c
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@ -1079,14 +1079,11 @@ pmap_pinit(pmap)
while ((pml4pg = vm_page_alloc(NULL, color++, VM_ALLOC_NOOBJ |
VM_ALLOC_NORMAL | VM_ALLOC_WIRED | VM_ALLOC_ZERO)) == NULL)
VM_WAIT;
vm_page_lock_queues();
vm_page_flag_clear(pml4pg, PG_BUSY);
vm_page_unlock_queues();
pmap->pm_pml4 = (pml4_entry_t *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(pml4pg));
if ((pml4pg->flags & PG_ZERO) == 0)
bzero(pmap->pm_pml4, PAGE_SIZE);
pagezero(pmap->pm_pml4);
mtx_lock_spin(&allpmaps_lock);
LIST_INSERT_HEAD(&allpmaps, pmap, pm_list);
@ -1254,7 +1251,6 @@ _pmap_allocpte(pmap, ptepindex)
}
vm_page_lock_queues();
vm_page_flag_clear(m, PG_ZERO);
vm_page_wakeup(m);
vm_page_unlock_queues();
@ -1424,7 +1420,6 @@ pmap_release(pmap_t pmap)
m = PHYS_TO_VM_PAGE(pmap->pm_pml4[PML4PML4I]);
m->wire_count--;
atomic_subtract_int(&cnt.v_wire_count, 1);
vm_page_busy(m);
vm_page_free(m);
vm_page_unlock_queues();
}